docs: update CHANGELOG.md for 0.46.0

Author: github-actions[bot]

CHANGELOG.md

@@ -4,6 +4,57 @@ All notable changes to this project are documented in this file.
 This changelog is automatically generated from GitHub Releases.
 
 ---
+## [0.46.0](https://github.com/koxudaxi/datamodel-code-generator/releases/tag/0.46.0) - 2025-12-20
+
+## Breaking Changes
+
+ ### Python Version
+ * Python 3.9 support dropped - Minimum Python version is now 3.10+ (#2692)
+
+ ### Default Behavior Changes
+ * Native type hints by default - `list[...]`/`dict[...]` are now used instead of `List[...]`/`Dict[...]`. Use `--no-use-standard-collections` to restore previous behavior (#2699)
+ * Union operator by default - `X | Y` syntax is now used instead of `Union[X, Y]`/`Optional[X]`. Use `--no-use-union-operator` to restore previous behavior (#2703)
+
+ ### Code Generation Changes
+ * Nullable required fields no longer have default values (Pydantic v2) - Fields marked as both `required` and `nullable` no longer get `= None`. The `pydantic_v2/BaseModel.jinja2` template logic was updated to only assign default values when `field.required` is false. This fixes incorrect behavior where required fields could be omitted (#2520)
+ * TypedDict respects enum_field_as_literal setting - TypedDict output now respects user's `--enum-field-as-literal` setting instead of forcing `all`. Added new `--enum-field-as-literal none` option (#2691)
+ * prefixItems now generates tuple types - JSON Schema `prefixItems` with matching `minItems`/`maxItems` and no `items` now generates `tuple[T1, T2, ...]` instead of `list[...]`. This applies when the array has a fixed length with heterogeneous types (#2537)
+
+
+## What's Changed
+* feat: Add --use-status-code-in-response-name option by @koxudaxi in https://github.com/koxudaxi/datamodel-code-generator/pull/2688
+* feat: Add support for number type with time-delta format by @koxudaxi in https://github.com/koxudaxi/datamodel-code-generator/pull/2689
+* docs: Add CHANGELOG.md with auto-update workflow by @koxudaxi in https://github.com/koxudaxi/datamodel-code-generator/pull/2690
+* feat: Add --enum-field-as-literal none option and respect user settings for TypedDict by @koxudaxi in https://github.com/koxudaxi/datamodel-code-generator/pull/2691
+* docs: Clarify default encoding behavior in documentation by @koxudaxi in https://github.com/koxudaxi/datamodel-code-generator/pull/2693
+* ci: Improve CLI docs generation workflow by @koxudaxi in https://github.com/koxudaxi/datamodel-code-generator/pull/2695
+* feat(docs): Group CLI examples by schema type with tabs by @koxudaxi in https://github.com/koxudaxi/datamodel-code-generator/pull/2696
+* feat: Add --ignore-enum-constraints option by @koxudaxi in https://github.com/koxudaxi/datamodel-code-generator/pull/2694
+* Add zensical.toml configuration by @koxudaxi in https://github.com/koxudaxi/datamodel-code-generator/pull/2697
+* fix: Make docs generation deterministic by sorting glob results and dict iterations by @koxudaxi in https://github.com/koxudaxi/datamodel-code-generator/pull/2698
+* feat: Drop Python 3.9 support, require Python 3.10+  by @koxudaxi in https://github.com/koxudaxi/datamodel-code-generator/pull/2692
+* fix: Update zensical dependency version to 0.0.13 for Python 3.10+ by @koxudaxi in https://github.com/koxudaxi/datamodel-code-generator/pull/2700
+* feat: Default to native list/dict type hints instead of typing.List/Dict by @koxudaxi in https://github.com/koxudaxi/datamodel-code-generator/pull/2699
+* fix: Remove unnecessary pass statement when nested class exists by @koxudaxi in https://github.com/koxudaxi/datamodel-code-generator/pull/2704
+* build: Replace pre-commit with prek by @koxudaxi in https://github.com/koxudaxi/datamodel-code-generator/pull/2702
+* fix: Improve state management in Imports, DataType, and DataModel classes by @koxudaxi in https://github.com/koxudaxi/datamodel-code-generator/pull/2705
+* feat: Default to union operator for type hints by @koxudaxi in https://github.com/koxudaxi/datamodel-code-generator/pull/2703
+* fix: handle fork PRs in lint workflow by @koxudaxi in https://github.com/koxudaxi/datamodel-code-generator/pull/2706
+* fix: handle fork PRs in readme and cli-docs workflows by @koxudaxi in https://github.com/koxudaxi/datamodel-code-generator/pull/2707
+* Nullable required fields should not have default value by @raymondbutcher in https://github.com/koxudaxi/datamodel-code-generator/pull/2520
+* Add support for prefixItems to emit tuples by @saulshanabrook in https://github.com/koxudaxi/datamodel-code-generator/pull/2537
+* Remove unnecessary flags from --check test by @koxudaxi in https://github.com/koxudaxi/datamodel-code-generator/pull/2708
+* fix: update expected files to use modern union type syntax (`str | None`) by @koxudaxi in https://github.com/koxudaxi/datamodel-code-generator/pull/2709
+* fix: trigger docs build after changelog update by @koxudaxi in https://github.com/koxudaxi/datamodel-code-generator/pull/2710
+
+## New Contributors
+* @raymondbutcher made their first contribution in https://github.com/koxudaxi/datamodel-code-generator/pull/2520
+* @saulshanabrook made their first contribution in https://github.com/koxudaxi/datamodel-code-generator/pull/2537
+
+**Full Changelog**: https://github.com/koxudaxi/datamodel-code-generator/compare/0.45.0...0.46.0
+
+---
+
 
 ## [0.45.0](https://github.com/koxudaxi/datamodel-code-generator/releases/tag/0.45.0) - 2025-12-19