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feat(anthropic): add claude-opus-5; coerce thinking to adaptive on budget-less models #115

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Merged
leoveanv merged 1 commit into from
Aug 13, 2026
Merged

feat(anthropic): add claude-opus-5; coerce thinking to adaptive on budget-less models #115

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17 changes: 16 additions & 1 deletion symai/backend/engines/neurosymbolic/anthropic/engine.py
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Original file line number Diff line number Diff line change
Expand Up @@ -392,9 +392,24 @@ def _build_thinking_config(self, thinking_arg, model, spec):

thinking_type = thinking_arg.get("type")
if thinking_type == "disabled":
if model == "claude-fable-5":
# Fable rejects an explicit {"type": "disabled"} (thinking is
# always on); omitting the parameter is the closest valid form.
logger.warning(
"Thinking cannot be disabled on claude-fable-5; omitting the thinking parameter."
)
return None, None
return {"type": "disabled"}, None

if model in {"claude-opus-4-8", "claude-opus-4-7"}:
# Models where manual thinking (budget_tokens) is removed entirely — any
# thinking request is coerced to adaptive (budget_tokens returns 400 there).
Comment on lines +404 to +405
if model in {
"claude-fable-5",
"claude-opus-5",
"claude-sonnet-5",
"claude-opus-4-8",
Comment on lines +406 to +410
"claude-opus-4-7",
}:
return {"type": "adaptive"}, thinking_arg.get("effort")

if thinking_type == "adaptive":
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14 changes: 14 additions & 0 deletions symai/backend/engines/neurosymbolic/anthropic/models.py
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Expand Up @@ -52,6 +52,20 @@ class AnthropicModelSpec:
sampling=False,
pricing=ModelPricing(input=10.00, output=50.00, cached_input=1.00),
),
"claude-opus-5": AnthropicModelSpec(
context_tokens=LONG_CONTEXT_1M_TOKENS,
response_tokens=128_000,
reasoning=True,
vision=True,
# NOTE: thinking is on by default (an omitted `thinking` runs adaptive);
# `disabled` is only accepted at effort high or lower. Sampling kwargs
# are rejected as deprecated.
adaptive_thinking=True,
long_context_1m=True,
default_long_context_1m=True,
sampling=False,
pricing=ModelPricing(input=5.00, output=25.00, cached_input=0.50),
),
Comment on lines +55 to +68
"claude-sonnet-5": AnthropicModelSpec(
context_tokens=LONG_CONTEXT_1M_TOKENS,
response_tokens=128_000,
Expand Down