diff --git a/docs/cli-reference/model-customization.md b/docs/cli-reference/model-customization.md
index 302dac082..3921fec1a 100644
--- a/docs/cli-reference/model-customization.md
+++ b/docs/cli-reference/model-customization.md
@@ -1125,7 +1125,20 @@ The `--base-class` flag configures the code generation behavior.
 Specify different base classes for specific models via JSON mapping.
 
 The `--base-class-map` option allows you to assign different base classes
-to specific models. Priority: base-class-map > customBasePath > base-class.
+to specific models. This is useful when you want selective base class inheritance,
+for example, applying custom base classes only to specific models while leaving
+others with the default `BaseModel`.
+
+Priority: `--base-class-map` > `customBasePath` (schema extension) > `--base-class`
+
+You can specify either a single base class as a string, or multiple base classes
+(mixins) as a list:
+
+- Single: `{"Person": "custom.bases.PersonBase"}`
+- Multiple: `{"User": ["mixins.AuditMixin", "mixins.TimestampMixin"]}`
+
+When using multiple base classes, the specified classes are used directly without
+adding `BaseModel`. Ensure your mixins inherit from `BaseModel` if needed.
 
 **Related:** [`--base-class`](model-customization.md#base-class)
 
diff --git a/docs/jsonschema.md b/docs/jsonschema.md
index 0a124c92a..6546a3947 100644
--- a/docs/jsonschema.md
+++ b/docs/jsonschema.md
@@ -124,9 +124,90 @@ class Defaults(BaseModel):
 
 ---
 
+## Custom Base Class with `customBasePath`
+
+You can specify custom base classes directly in your JSON Schema using the `customBasePath` extension. This allows you to define base classes at the schema level without using CLI options.
+
+### Single Base Class
+
+```json
+{
+  "$schema": "http://json-schema.org/draft-07/schema#",
+  "title": "User",
+  "type": "object",
+  "customBasePath": "myapp.models.UserBase",
+  "properties": {
+    "name": {"type": "string"},
+    "email": {"type": "string"}
+  },
+  "required": ["name", "email"]
+}
+```
+
+**Generated Output:**
+
+```python
+from __future__ import annotations
+
+from myapp.models import UserBase
+
+
+class User(UserBase):
+    name: str
+    email: str
+```
+
+### Multiple Base Classes (Mixins)
+
+You can also specify multiple base classes as a list to implement mixin patterns:
+
+```json
+{
+  "$schema": "http://json-schema.org/draft-07/schema#",
+  "title": "User",
+  "type": "object",
+  "customBasePath": ["mixins.AuditMixin", "mixins.TimestampMixin"],
+  "properties": {
+    "name": {"type": "string"},
+    "email": {"type": "string"}
+  },
+  "required": ["name", "email"]
+}
+```
+
+**Generated Output:**
+
+```python
+from __future__ import annotations
+
+from mixins import AuditMixin, TimestampMixin
+
+
+class User(AuditMixin, TimestampMixin):
+    name: str
+    email: str
+```
+
+!!! note "Mixin Usage"
+    When using multiple base classes, the specified classes are used directly without adding `BaseModel`.
+    Ensure your mixins inherit from `pydantic.BaseModel` if you need Pydantic model behavior.
+
+### Priority Resolution
+
+When multiple base class configurations are present, they are resolved in this order:
+
+1. **`--base-class-map`** (CLI option) - Highest priority
+2. **`customBasePath`** (JSON Schema extension)
+3. **`--base-class`** (CLI option) - Lowest priority (default for all models)
+
+This allows you to set a default base class with `--base-class`, override specific models in the schema with `customBasePath`, and further override at the CLI level with `--base-class-map`.
+
+---
+
 ## 📖 See Also
 
 - 🖥️ [CLI Reference](cli-reference/index.md) - Complete CLI options reference
 - 🔧 [CLI Reference: Typing Customization](cli-reference/typing-customization.md) - Type annotation options
 - 🏷️ [CLI Reference: Field Customization](cli-reference/field-customization.md) - Field naming and constraint options
 - 📊 [Supported Data Types](supported-data-types.md) - JSON Schema data type support
+- 🏗️ [CLI Reference: Model Customization](cli-reference/model-customization.md) - Base class and model customization options
diff --git a/docs/llms-full.txt b/docs/llms-full.txt
index f457673dc..bdbf5e8e0 100644
--- a/docs/llms-full.txt
+++ b/docs/llms-full.txt
@@ -1988,7 +1988,20 @@ The `--base-class` flag configures the code generation behavior.
 Specify different base classes for specific models via JSON mapping.
 
 The `--base-class-map` option allows you to assign different base classes
-to specific models. Priority: base-class-map > customBasePath > base-class.
+to specific models. This is useful when you want selective base class inheritance,
+for example, applying custom base classes only to specific models while leaving
+others with the default `BaseModel`.
+
+Priority: `--base-class-map` > `customBasePath` (schema extension) > `--base-class`
+
+You can specify either a single base class as a string, or multiple base classes
+(mixins) as a list:
+
+- Single: `{"Person": "custom.bases.PersonBase"}`
+- Multiple: `{"User": ["mixins.AuditMixin", "mixins.TimestampMixin"]}`
+
+When using multiple base classes, the specified classes are used directly without
+adding `BaseModel`. Ensure your mixins inherit from `BaseModel` if needed.
 
 **Related:** [`--base-class`](model-customization.md#base-class)
 
@@ -24171,12 +24184,93 @@ class Defaults(BaseModel):
 
 ---
 
+## Custom Base Class with `customBasePath`
+
+You can specify custom base classes directly in your JSON Schema using the `customBasePath` extension. This allows you to define base classes at the schema level without using CLI options.
+
+### Single Base Class
+
+```json
+{
+  "$schema": "http://json-schema.org/draft-07/schema#",
+  "title": "User",
+  "type": "object",
+  "customBasePath": "myapp.models.UserBase",
+  "properties": {
+    "name": {"type": "string"},
+    "email": {"type": "string"}
+  },
+  "required": ["name", "email"]
+}
+```
+
+**Generated Output:**
+
+```python
+from __future__ import annotations
+
+from myapp.models import UserBase
+
+
+class User(UserBase):
+    name: str
+    email: str
+```
+
+### Multiple Base Classes (Mixins)
+
+You can also specify multiple base classes as a list to implement mixin patterns:
+
+```json
+{
+  "$schema": "http://json-schema.org/draft-07/schema#",
+  "title": "User",
+  "type": "object",
+  "customBasePath": ["mixins.AuditMixin", "mixins.TimestampMixin"],
+  "properties": {
+    "name": {"type": "string"},
+    "email": {"type": "string"}
+  },
+  "required": ["name", "email"]
+}
+```
+
+**Generated Output:**
+
+```python
+from __future__ import annotations
+
+from mixins import AuditMixin, TimestampMixin
+
+
+class User(AuditMixin, TimestampMixin):
+    name: str
+    email: str
+```
+
+!!! note "Mixin Usage"
+    When using multiple base classes, the specified classes are used directly without adding `BaseModel`.
+    Ensure your mixins inherit from `pydantic.BaseModel` if you need Pydantic model behavior.
+
+### Priority Resolution
+
+When multiple base class configurations are present, they are resolved in this order:
+
+1. **`--base-class-map`** (CLI option) - Highest priority
+2. **`customBasePath`** (JSON Schema extension)
+3. **`--base-class`** (CLI option) - Lowest priority (default for all models)
+
+This allows you to set a default base class with `--base-class`, override specific models in the schema with `customBasePath`, and further override at the CLI level with `--base-class-map`.
+
+---
+
 ## 📖 See Also
 
 - 🖥️ [CLI Reference](cli-reference/index.md) - Complete CLI options reference
 - 🔧 [CLI Reference: Typing Customization](cli-reference/typing-customization.md) - Type annotation options
 - 🏷️ [CLI Reference: Field Customization](cli-reference/field-customization.md) - Field naming and constraint options
 - 📊 [Supported Data Types](supported-data-types.md) - JSON Schema data type support
+- 🏗️ [CLI Reference: Model Customization](cli-reference/model-customization.md) - Base class and model customization options
 
 ---
 
diff --git a/src/datamodel_code_generator/__main__.py b/src/datamodel_code_generator/__main__.py
index cfc52f236..cfd353323 100644
--- a/src/datamodel_code_generator/__main__.py
+++ b/src/datamodel_code_generator/__main__.py
@@ -499,7 +499,7 @@ def validate_class_name_affix_scope(cls, v: str | ClassNameAffixScope | None) ->
     target_python_version: PythonVersion = PythonVersionMin
     target_pydantic_version: Optional[TargetPydanticVersion] = None  # noqa: UP045
     base_class: str = ""
-    base_class_map: Optional[dict[str, str]] = None  # noqa: UP045
+    base_class_map: Optional[dict[str, str | list[str]]] = None  # noqa: UP045
     additional_imports: Optional[list[str]] = None  # noqa: UP045
     class_decorators: Optional[list[str]] = None  # noqa: UP045
     custom_template_dir: Optional[Path] = None  # noqa: UP045
diff --git a/src/datamodel_code_generator/_types/generate_config_dict.py b/src/datamodel_code_generator/_types/generate_config_dict.py
index ce0c52847..792113f3f 100644
--- a/src/datamodel_code_generator/_types/generate_config_dict.py
+++ b/src/datamodel_code_generator/_types/generate_config_dict.py
@@ -46,7 +46,7 @@ class GenerateConfigDict(TypedDict):
     target_python_version: NotRequired[PythonVersion]
     target_pydantic_version: NotRequired[TargetPydanticVersion | None]
     base_class: NotRequired[str]
-    base_class_map: NotRequired[dict[str, str] | None]
+    base_class_map: NotRequired[dict[str, str | list[str]] | None]
     additional_imports: NotRequired[list[str] | None]
     class_decorators: NotRequired[list[str] | None]
     custom_template_dir: NotRequired[Path | None]
diff --git a/src/datamodel_code_generator/_types/parser_config_dicts.py b/src/datamodel_code_generator/_types/parser_config_dicts.py
index f63151bd1..8c2a49eea 100644
--- a/src/datamodel_code_generator/_types/parser_config_dicts.py
+++ b/src/datamodel_code_generator/_types/parser_config_dicts.py
@@ -46,7 +46,7 @@ class ParserConfigDict(TypedDict):
     data_type_manager_type: NotRequired[type[DataTypeManager]]
     data_model_field_type: NotRequired[type[DataModelFieldBase]]
     base_class: NotRequired[str | None]
-    base_class_map: NotRequired[dict[str, str] | None]
+    base_class_map: NotRequired[dict[str, str | list[str]] | None]
     additional_imports: NotRequired[list[str] | None]
     class_decorators: NotRequired[list[str] | None]
     custom_template_dir: NotRequired[Path | None]
diff --git a/src/datamodel_code_generator/config.py b/src/datamodel_code_generator/config.py
index 18ca37980..ac37fd6dc 100644
--- a/src/datamodel_code_generator/config.py
+++ b/src/datamodel_code_generator/config.py
@@ -83,7 +83,7 @@ class Config:
     target_python_version: PythonVersion = PythonVersionMin
     target_pydantic_version: TargetPydanticVersion | None = None
     base_class: str = ""
-    base_class_map: dict[str, str] | None = None
+    base_class_map: dict[str, str | list[str]] | None = None
     additional_imports: list[str] | None = None
     class_decorators: list[str] | None = None
     custom_template_dir: Path | None = None
@@ -225,7 +225,7 @@ class Config:
     data_type_manager_type: type[DataTypeManager] = pydantic_model.DataTypeManager
     data_model_field_type: type[DataModelFieldBase] = pydantic_model.DataModelField
     base_class: str | None = None
-    base_class_map: dict[str, str] | None = None
+    base_class_map: dict[str, str | list[str]] | None = None
     additional_imports: list[str] | None = None
     class_decorators: list[str] | None = None
     custom_template_dir: Path | None = None
diff --git a/src/datamodel_code_generator/model/base.py b/src/datamodel_code_generator/model/base.py
index a4a7d9868..193feb5c5 100644
--- a/src/datamodel_code_generator/model/base.py
+++ b/src/datamodel_code_generator/model/base.py
@@ -643,7 +643,7 @@ def __init__(  # noqa: PLR0913
         fields: list[DataModelFieldBase],
         decorators: list[str] | None = None,
         base_classes: list[Reference] | None = None,
-        custom_base_class: str | None = None,
+        custom_base_class: str | list[str] | None = None,
         custom_template_dir: Path | None = None,
         extra_template_data: defaultdict[str, dict[str, Any]] | None = None,
         methods: list[str] | None = None,
@@ -781,14 +781,24 @@ def replace_children_in_models(self, models: list[DataModel], new_ref: Reference
                 child.replace_reference(new_ref)
 
     def set_base_class(self) -> None:
-        """Set up the base class for this model."""
-        base_class = self.custom_base_class or self.BASE_CLASS
-        if not base_class:
+        """Set up the base class(es) for this model."""
+        if self.custom_base_class is None:
+            base_class_list = [self.BASE_CLASS] if self.BASE_CLASS else []
+        elif isinstance(self.custom_base_class, list):
+            base_class_list = self.custom_base_class
+        else:
+            base_class_list = [self.custom_base_class]
+
+        if not base_class_list:
             self.base_classes = []
             return
-        base_class_import = Import.from_full_path(base_class)
-        self._additional_imports.append(base_class_import)
-        self.base_classes = [BaseClassDataType.from_import(base_class_import)]
+
+        result = []
+        for base_class in base_class_list:
+            base_class_import = Import.from_full_path(base_class)
+            self._additional_imports.append(base_class_import)
+            result.append(BaseClassDataType.from_import(base_class_import))
+        self.base_classes = result
 
     @cached_property
     def template_file_path(self) -> Path:
diff --git a/src/datamodel_code_generator/model/dataclass.py b/src/datamodel_code_generator/model/dataclass.py
index 70f1645c3..964c6731d 100644
--- a/src/datamodel_code_generator/model/dataclass.py
+++ b/src/datamodel_code_generator/model/dataclass.py
@@ -58,7 +58,7 @@ def __init__(  # noqa: PLR0913
         fields: list[DataModelFieldBase],
         decorators: list[str] | None = None,
         base_classes: list[Reference] | None = None,
-        custom_base_class: str | None = None,
+        custom_base_class: str | list[str] | None = None,
         custom_template_dir: Path | None = None,
         extra_template_data: defaultdict[str, dict[str, Any]] | None = None,
         methods: list[str] | None = None,
diff --git a/src/datamodel_code_generator/model/enum.py b/src/datamodel_code_generator/model/enum.py
index 403ab599b..0f63b1ec5 100644
--- a/src/datamodel_code_generator/model/enum.py
+++ b/src/datamodel_code_generator/model/enum.py
@@ -51,7 +51,7 @@ def __init__(  # noqa: PLR0913
         fields: list[DataModelFieldBase],
         decorators: list[str] | None = None,
         base_classes: list[Reference] | None = None,
-        custom_base_class: str | None = None,
+        custom_base_class: str | list[str] | None = None,
         custom_template_dir: Path | None = None,
         extra_template_data: defaultdict[str, dict[str, Any]] | None = None,
         methods: list[str] | None = None,
diff --git a/src/datamodel_code_generator/model/msgspec.py b/src/datamodel_code_generator/model/msgspec.py
index 9185a2a65..e1903cb38 100644
--- a/src/datamodel_code_generator/model/msgspec.py
+++ b/src/datamodel_code_generator/model/msgspec.py
@@ -132,7 +132,7 @@ def __init__(  # noqa: PLR0913
         fields: list[DataModelFieldBase],
         decorators: list[str] | None = None,
         base_classes: list[Reference] | None = None,
-        custom_base_class: str | None = None,
+        custom_base_class: str | list[str] | None = None,
         custom_template_dir: Path | None = None,
         extra_template_data: defaultdict[str, dict[str, Any]] | None = None,
         methods: list[str] | None = None,
diff --git a/src/datamodel_code_generator/model/pydantic/base_model.py b/src/datamodel_code_generator/model/pydantic/base_model.py
index 70af15e1b..e522660e2 100644
--- a/src/datamodel_code_generator/model/pydantic/base_model.py
+++ b/src/datamodel_code_generator/model/pydantic/base_model.py
@@ -286,7 +286,7 @@ def __init__(  # noqa: PLR0913
         fields: list[DataModelFieldBase],
         decorators: list[str] | None = None,
         base_classes: list[Reference] | None = None,
-        custom_base_class: str | None = None,
+        custom_base_class: str | list[str] | None = None,
         custom_template_dir: Path | None = None,
         extra_template_data: defaultdict[str, Any] | None = None,
         path: Path | None = None,
@@ -343,7 +343,7 @@ def __init__(  # noqa: PLR0912, PLR0913
         fields: list[DataModelFieldBase],
         decorators: list[str] | None = None,
         base_classes: list[Reference] | None = None,
-        custom_base_class: str | None = None,
+        custom_base_class: str | list[str] | None = None,
         custom_template_dir: Path | None = None,
         extra_template_data: defaultdict[str, Any] | None = None,
         path: Path | None = None,
diff --git a/src/datamodel_code_generator/model/pydantic_v2/base_model.py b/src/datamodel_code_generator/model/pydantic_v2/base_model.py
index 44e577641..91d5725a2 100644
--- a/src/datamodel_code_generator/model/pydantic_v2/base_model.py
+++ b/src/datamodel_code_generator/model/pydantic_v2/base_model.py
@@ -245,7 +245,7 @@ def __init__(  # noqa: PLR0913
         fields: list[DataModelFieldBase],
         decorators: list[str] | None = None,
         base_classes: list[Reference] | None = None,
-        custom_base_class: str | None = None,
+        custom_base_class: str | list[str] | None = None,
         custom_template_dir: Path | None = None,
         extra_template_data: defaultdict[str, Any] | None = None,
         path: Path | None = None,
diff --git a/src/datamodel_code_generator/model/pydantic_v2/dataclass.py b/src/datamodel_code_generator/model/pydantic_v2/dataclass.py
index 625f7bf93..1b751adb7 100644
--- a/src/datamodel_code_generator/model/pydantic_v2/dataclass.py
+++ b/src/datamodel_code_generator/model/pydantic_v2/dataclass.py
@@ -43,7 +43,7 @@ def __init__(  # noqa: PLR0913
         fields: list[DataModelFieldBase],
         decorators: list[str] | None = None,
         base_classes: list[Reference] | None = None,
-        custom_base_class: str | None = None,
+        custom_base_class: str | list[str] | None = None,
         custom_template_dir: Path | None = None,
         extra_template_data: defaultdict[str, dict[str, Any]] | None = None,
         methods: list[str] | None = None,
diff --git a/src/datamodel_code_generator/model/scalar.py b/src/datamodel_code_generator/model/scalar.py
index 927088fc7..dcddddb4c 100644
--- a/src/datamodel_code_generator/model/scalar.py
+++ b/src/datamodel_code_generator/model/scalar.py
@@ -48,7 +48,7 @@ def __init__(  # noqa: PLR0913
         fields: list[DataModelFieldBase],
         decorators: list[str] | None = None,
         base_classes: list[Reference] | None = None,
-        custom_base_class: str | None = None,
+        custom_base_class: str | list[str] | None = None,
         custom_template_dir: Path | None = None,
         extra_template_data: defaultdict[str, dict[str, Any]] | None = None,
         methods: list[str] | None = None,
diff --git a/src/datamodel_code_generator/model/typed_dict.py b/src/datamodel_code_generator/model/typed_dict.py
index 6a93dedd9..9e8eded51 100644
--- a/src/datamodel_code_generator/model/typed_dict.py
+++ b/src/datamodel_code_generator/model/typed_dict.py
@@ -60,7 +60,7 @@ def __init__(  # noqa: PLR0913
         fields: list[DataModelFieldBase],
         decorators: list[str] | None = None,
         base_classes: list[Reference] | None = None,
-        custom_base_class: str | None = None,
+        custom_base_class: str | list[str] | None = None,
         custom_template_dir: Path | None = None,
         extra_template_data: defaultdict[str, dict[str, Any]] | None = None,
         methods: list[str] | None = None,
diff --git a/src/datamodel_code_generator/model/union.py b/src/datamodel_code_generator/model/union.py
index e24d94144..1375c90fb 100644
--- a/src/datamodel_code_generator/model/union.py
+++ b/src/datamodel_code_generator/model/union.py
@@ -33,7 +33,7 @@ def __init__(  # noqa: PLR0913
         fields: list[DataModelFieldBase],
         decorators: list[str] | None = None,
         base_classes: list[Reference] | None = None,
-        custom_base_class: str | None = None,
+        custom_base_class: str | list[str] | None = None,
         custom_template_dir: Path | None = None,
         extra_template_data: defaultdict[str, dict[str, Any]] | None = None,
         methods: list[str] | None = None,
diff --git a/src/datamodel_code_generator/parser/base.py b/src/datamodel_code_generator/parser/base.py
index dc1bca6b5..b018c1139 100644
--- a/src/datamodel_code_generator/parser/base.py
+++ b/src/datamodel_code_generator/parser/base.py
@@ -780,7 +780,7 @@ def __init__(  # noqa: PLR0912, PLR0915
         self.class_decorators: list[str] = config.class_decorators or []
 
         self.base_class: str | None = config.base_class
-        self.base_class_map: dict[str, str] | None = config.base_class_map
+        self.base_class_map: dict[str, str | list[str]] | None = config.base_class_map
         self.target_python_version: PythonVersion = config.target_python_version
         self.results: list[DataModel] = []
         self.dump_resolve_reference_action: Callable[[Iterable[str]], str] | None = config.dump_resolve_reference_action
@@ -1033,11 +1033,27 @@ def _append_additional_imports(self, additional_imports: list[str] | None) -> No
             new_import = Import.from_full_path(additional_import_string)
             self.imports.append(new_import)
 
-    def _resolve_base_class(self, class_name: str, custom_base_path: str | None = None) -> str | None:
-        """Resolve base class with priority: base_class_map > customBasePath > base_class."""
+    def _resolve_base_class(
+        self, class_name: str, custom_base_path: str | list[str] | None = None
+    ) -> str | list[str] | None:
+        """Resolve base class(es) with priority: base_class_map > customBasePath > base_class."""
+
+        def normalize(value: str | list[str] | None) -> str | list[str] | None:
+            if value is None:  # pragma: no cover
+                return None
+            if isinstance(value, list):
+                seen: set[str] = set()
+                result = [v for v in value if isinstance(v, str) and v and v not in seen and not seen.add(v)]  # type: ignore[func-returns-value]
+                if not result:
+                    return None
+                return result[0] if len(result) == 1 else result
+            return value or None
+
         if self.base_class_map and class_name in self.base_class_map:
-            return self.base_class_map[class_name]
-        return custom_base_path or self.base_class
+            return normalize(self.base_class_map[class_name])
+        if custom_base_path:
+            return normalize(custom_base_path)
+        return self.base_class or None
 
     def _get_text_from_url(self, url: str) -> str:
         from datamodel_code_generator.http import DEFAULT_HTTP_TIMEOUT, get_body  # noqa: PLC0415
diff --git a/src/datamodel_code_generator/parser/jsonschema.py b/src/datamodel_code_generator/parser/jsonschema.py
index c427902dc..c73f23af1 100644
--- a/src/datamodel_code_generator/parser/jsonschema.py
+++ b/src/datamodel_code_generator/parser/jsonschema.py
@@ -361,7 +361,7 @@ def validate_null_type(cls, value: Any) -> Any:  # noqa: N805
     default: Any = None
     id: Optional[str] = Field(default=None, alias="$id")  # noqa: UP045
     custom_type_path: Optional[str] = Field(default=None, alias="customTypePath")  # noqa: UP045
-    custom_base_path: Optional[str] = Field(default=None, alias="customBasePath")  # noqa: UP045
+    custom_base_path: str | list[str] | None = Field(default=None, alias="customBasePath")
     extras: dict[str, Any] = Field(alias=__extra_key__, default_factory=dict)
     discriminator: Optional[Union[Discriminator, str]] = None  # noqa: UP007, UP045
     if is_pydantic_v2():
diff --git a/tests/data/expected/main/input_model/config_class.py b/tests/data/expected/main/input_model/config_class.py
index 09fc41050..d8b3b23ae 100644
--- a/tests/data/expected/main/input_model/config_class.py
+++ b/tests/data/expected/main/input_model/config_class.py
@@ -122,7 +122,7 @@ class GenerateConfig(TypedDict):
     target_python_version: NotRequired[PythonVersion]
     target_pydantic_version: NotRequired[TargetPydanticVersion | None]
     base_class: NotRequired[str]
-    base_class_map: NotRequired[dict[str, str] | None]
+    base_class_map: NotRequired[dict[str, str | list[str]] | None]
     additional_imports: NotRequired[list[str] | None]
     class_decorators: NotRequired[list[str] | None]
     custom_template_dir: NotRequired[str | None]
diff --git a/tests/data/expected/main/jsonschema/base_class_map_empty_list.py b/tests/data/expected/main/jsonschema/base_class_map_empty_list.py
new file mode 100644
index 000000000..ec8c96553
--- /dev/null
+++ b/tests/data/expected/main/jsonschema/base_class_map_empty_list.py
@@ -0,0 +1,17 @@
+# generated by datamodel-codegen:
+#   filename:  base_class_map_empty_list.json
+#   timestamp: 2019-07-26T00:00:00+00:00
+
+from __future__ import annotations
+
+from typing import Any
+
+from pydantic import BaseModel
+
+
+class Model(BaseModel):
+    __root__: Any
+
+
+class User(BaseModel):
+    name: str | None = None
diff --git a/tests/data/expected/main/jsonschema/base_class_map_list.py b/tests/data/expected/main/jsonschema/base_class_map_list.py
new file mode 100644
index 000000000..f34a91c9b
--- /dev/null
+++ b/tests/data/expected/main/jsonschema/base_class_map_list.py
@@ -0,0 +1,23 @@
+# generated by datamodel-codegen:
+#   filename:  base_class_map_list.json
+#   timestamp: 2019-07-26T00:00:00+00:00
+
+from __future__ import annotations
+
+from typing import Any
+
+from admin import AdminBase
+from mixins import AuditMixin, TimestampMixin
+from pydantic import BaseModel
+
+
+class Model(BaseModel):
+    __root__: Any
+
+
+class User(AuditMixin, TimestampMixin):
+    name: str | None = None
+
+
+class Admin(AdminBase):
+    role: str | None = None
diff --git a/tests/data/expected/main/jsonschema/custom_base_paths_list.py b/tests/data/expected/main/jsonschema/custom_base_paths_list.py
new file mode 100644
index 000000000..ab567f124
--- /dev/null
+++ b/tests/data/expected/main/jsonschema/custom_base_paths_list.py
@@ -0,0 +1,12 @@
+# generated by datamodel-codegen:
+#   filename:  custom_base_paths_list.json
+#   timestamp: 2019-07-26T00:00:00+00:00
+
+from __future__ import annotations
+
+from mixins import AuditMixin, TimestampMixin
+
+
+class User(AuditMixin, TimestampMixin):
+    name: str
+    email: str
diff --git a/tests/data/jsonschema/base_class_map_empty_list.json b/tests/data/jsonschema/base_class_map_empty_list.json
new file mode 100644
index 000000000..26a1dbd97
--- /dev/null
+++ b/tests/data/jsonschema/base_class_map_empty_list.json
@@ -0,0 +1,11 @@
+{
+  "$schema": "http://json-schema.org/draft-07/schema#",
+  "definitions": {
+    "User": {
+      "type": "object",
+      "properties": {
+        "name": {"type": "string"}
+      }
+    }
+  }
+}
diff --git a/tests/data/jsonschema/base_class_map_list.json b/tests/data/jsonschema/base_class_map_list.json
new file mode 100644
index 000000000..d592778c6
--- /dev/null
+++ b/tests/data/jsonschema/base_class_map_list.json
@@ -0,0 +1,17 @@
+{
+  "$schema": "http://json-schema.org/draft-07/schema#",
+  "definitions": {
+    "User": {
+      "type": "object",
+      "properties": {
+        "name": {"type": "string"}
+      }
+    },
+    "Admin": {
+      "type": "object",
+      "properties": {
+        "role": {"type": "string"}
+      }
+    }
+  }
+}
diff --git a/tests/data/jsonschema/custom_base_paths_list.json b/tests/data/jsonschema/custom_base_paths_list.json
new file mode 100644
index 000000000..65ae172ae
--- /dev/null
+++ b/tests/data/jsonschema/custom_base_paths_list.json
@@ -0,0 +1,15 @@
+{
+  "$schema": "http://json-schema.org/draft-07/schema#",
+  "title": "User",
+  "type": "object",
+  "customBasePath": ["mixins.AuditMixin", "mixins.TimestampMixin"],
+  "properties": {
+    "name": {
+      "type": "string"
+    },
+    "email": {
+      "type": "string"
+    }
+  },
+  "required": ["name", "email"]
+}
diff --git a/tests/main/jsonschema/test_main_jsonschema.py b/tests/main/jsonschema/test_main_jsonschema.py
index 6dda2ee8b..2f1fc14e0 100644
--- a/tests/main/jsonschema/test_main_jsonschema.py
+++ b/tests/main/jsonschema/test_main_jsonschema.py
@@ -2931,7 +2931,20 @@ def test_main_jsonschema_custom_base_path(output_file: Path) -> None:
     option_description="""Specify different base classes for specific models via JSON mapping.
 
 The `--base-class-map` option allows you to assign different base classes
-to specific models. Priority: base-class-map > customBasePath > base-class.""",
+to specific models. This is useful when you want selective base class inheritance,
+for example, applying custom base classes only to specific models while leaving
+others with the default `BaseModel`.
+
+Priority: `--base-class-map` > `customBasePath` (schema extension) > `--base-class`
+
+You can specify either a single base class as a string, or multiple base classes
+(mixins) as a list:
+
+- Single: `{"Person": "custom.bases.PersonBase"}`
+- Multiple: `{"User": ["mixins.AuditMixin", "mixins.TimestampMixin"]}`
+
+When using multiple base classes, the specified classes are used directly without
+adding `BaseModel`. Ensure your mixins inherit from `BaseModel` if needed.""",
     input_schema="jsonschema/base_class_map.json",
     cli_args=[
         "--base-class-map",
@@ -2959,6 +2972,47 @@ def test_main_jsonschema_base_class_map(output_file: Path) -> None:
     )
 
 
+def test_main_jsonschema_custom_base_paths_list(output_file: Path) -> None:
+    """Test customBasePath with list of base classes."""
+    run_main_and_assert(
+        input_path=JSON_SCHEMA_DATA_PATH / "custom_base_paths_list.json",
+        output_path=output_file,
+        input_file_type="jsonschema",
+        assert_func=assert_file_content,
+        expected_file="custom_base_paths_list.py",
+    )
+
+
+def test_main_jsonschema_base_class_map_list(output_file: Path) -> None:
+    """Test base_class_map with list values for multiple inheritance."""
+    run_main_and_assert(
+        input_path=JSON_SCHEMA_DATA_PATH / "base_class_map_list.json",
+        output_path=output_file,
+        input_file_type="jsonschema",
+        assert_func=assert_file_content,
+        expected_file="base_class_map_list.py",
+        extra_args=[
+            "--base-class-map",
+            '{"User": ["mixins.AuditMixin", "mixins.TimestampMixin"], "Admin": "admin.AdminBase"}',
+        ],
+    )
+
+
+def test_main_jsonschema_base_class_map_empty_list(output_file: Path) -> None:
+    """Test base_class_map with empty strings list (falls back to default)."""
+    run_main_and_assert(
+        input_path=JSON_SCHEMA_DATA_PATH / "base_class_map_empty_list.json",
+        output_path=output_file,
+        input_file_type="jsonschema",
+        assert_func=assert_file_content,
+        expected_file="base_class_map_empty_list.py",
+        extra_args=[
+            "--base-class-map",
+            '{"User": ["", ""]}',
+        ],
+    )
+
+
 def test_long_description(output_file: Path) -> None:
     """Test long description handling."""
     run_main_and_assert(
diff --git a/tests/main/test_public_api_signature_baseline.py b/tests/main/test_public_api_signature_baseline.py
index f9fff5b1e..3c0327259 100644
--- a/tests/main/test_public_api_signature_baseline.py
+++ b/tests/main/test_public_api_signature_baseline.py
@@ -65,7 +65,7 @@ def _baseline_generate(
     target_python_version: PythonVersion = PythonVersionMin,
     target_pydantic_version: TargetPydanticVersion | None = None,
     base_class: str = "",
-    base_class_map: dict[str, str] | None = None,
+    base_class_map: dict[str, str | list[str]] | None = None,
     additional_imports: list[str] | None = None,
     class_decorators: list[str] | None = None,
     custom_template_dir: Path | None = None,
@@ -201,7 +201,7 @@ def __init__(
         data_type_manager_type: type[DataTypeManager] = pydantic_model.DataTypeManager,
         data_model_field_type: type[DataModelFieldBase] = pydantic_model.DataModelField,
         base_class: str | None = None,
-        base_class_map: dict[str, str] | None = None,
+        base_class_map: dict[str, str | list[str]] | None = None,
         additional_imports: list[str] | None = None,
         class_decorators: list[str] | None = None,
         custom_template_dir: Path | None = None,