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[Anthropic][Frontend] Added chat_template_kwargs to /v1/messages #40125

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Merged
vllm-bot merged 2 commits into from
Apr 20, 2026
Merged

[Anthropic][Frontend] Added chat_template_kwargs to /v1/messages #40125

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55ede58
[Anthropic][Frontend] Added chat_template_kwargs to /v1/messages
Apr 17, 2026
2ddebb3
Merge branch 'main' into anthropic-request-template-kwargs
aleksandaryanakiev Apr 17, 2026
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16 changes: 16 additions & 0 deletions vllm/entrypoints/anthropic/protocol.py
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Original file line number Diff line number Diff line change
Expand Up @@ -117,6 +117,13 @@ class AnthropicMessagesRequest(BaseModel):
default=None,
description="KVTransfer parameters used for disaggregated serving.",
)
chat_template_kwargs: dict[str, Any] | None = Field(
default=None,
description=(
"Additional keyword args to pass to the chat template renderer. "
"Will be accessible by the template."
),
)

@field_validator("model")
@classmethod
Expand Down Expand Up @@ -212,6 +219,15 @@ class AnthropicCountTokensRequest(BaseModel):
tool_choice: AnthropicToolChoice | None = None
tools: list[AnthropicTool] | None = None

# vLLM-specific fields that are not in Anthropic spec
chat_template_kwargs: dict[str, Any] | None = Field(
default=None,
description=(
"Additional keyword args to pass to the chat template renderer. "
"Will be accessible by the template."
),
)

@field_validator("model")
@classmethod
def validate_model(cls, v):
Expand Down
2 changes: 2 additions & 0 deletions vllm/entrypoints/anthropic/serving.py
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Original file line number Diff line number Diff line change
Expand Up @@ -323,6 +323,7 @@ def _build_base_request(
return ChatCompletionRequest(
model=anthropic_request.model,
messages=openai_messages,
chat_template_kwargs=anthropic_request.chat_template_kwargs,
)

return ChatCompletionRequest(
Expand All @@ -335,6 +336,7 @@ def _build_base_request(
top_p=anthropic_request.top_p,
top_k=anthropic_request.top_k,
kv_transfer_params=anthropic_request.kv_transfer_params,
chat_template_kwargs=anthropic_request.chat_template_kwargs,
)

@classmethod
Expand Down
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