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[Feature]Supports Anthropic Thinking Block #33671

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Merged
chaunceyjiang merged 9 commits into from
Feb 28, 2026
Merged

[Feature]Supports Anthropic Thinking Block #33671

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4750708
fix message
Feb 3, 2026
0b49da5
fix error type
Feb 3, 2026
82df3f4
format
mariohong128 Feb 3, 2026
42e9312
fix
mariohong128 Feb 3, 2026
fd4522a
Merge branch 'main' into fix_message
chaunceyjiang Feb 25, 2026
6eff6e9
manage state using a separate class
mariohong128 Feb 25, 2026
c06b41e
Merge branch 'main' into fix_message
mariohong128 Feb 26, 2026
03f8d50
Merge branch 'main' into fix_message
chaunceyjiang Feb 28, 2026
85eafe2
Merge branch 'main' into fix_message
chaunceyjiang Feb 28, 2026
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12 changes: 10 additions & 2 deletions vllm/entrypoints/anthropic/protocol.py
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Original file line number Diff line number Diff line change
Expand Up @@ -34,7 +34,7 @@ class AnthropicUsage(BaseModel):
class AnthropicContentBlock(BaseModel):
"""Content block in message"""

type: Literal["text", "image", "tool_use", "tool_result"]
type: Literal["text", "image", "tool_use", "tool_result", "thinking"]
text: str | None = None
# For image content
source: dict[str, Any] | None = None
Expand All @@ -45,6 +45,9 @@ class AnthropicContentBlock(BaseModel):
input: dict[str, Any] | None = None
content: str | list[dict[str, Any]] | None = None
is_error: bool | None = None
# For thinking content
thinking: str | None = None
signature: str | None = None


class AnthropicMessage(BaseModel):
Expand Down Expand Up @@ -118,9 +121,14 @@ def validate_max_tokens(cls, v):
class AnthropicDelta(BaseModel):
"""Delta for streaming responses"""

type: Literal["text_delta", "input_json_delta"] | None = None
type: (
Literal["text_delta", "input_json_delta", "thinking_delta", "signature_delta"]
| None
) = None
text: str | None = None
thinking: str | None = None
partial_json: str | None = None
signature: str | None = None

# Message delta
stop_reason: (
Expand Down
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