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Fix/anthropic api compatibility #2603

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Merged
danielaskdd merged 2 commits into from
Jan 19, 2026
+11 −6
Merged

Fix/anthropic api compatibility #2603

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f13160c
fix(anthropic): Fix Delta attribute handling. Fix Delta attribute che…
aforstbach Jan 18, 2026
4d987a2
fix(anthropic): Fix system prompt parameter to use top-level 'system'…
aforstbach Jan 18, 2026
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17 changes: 11 additions & 6 deletions lightrag/llm/anthropic.py
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Original file line number Diff line number Diff line change
Expand Up @@ -100,8 +100,6 @@ async def anthropic_complete_if_cache(
)

messages: list[dict[str, Any]] = []
if system_prompt:
messages.append({"role": "system", "content": system_prompt})
messages.extend(history_messages)
messages.append({"role": "user", "content": prompt})

Expand All @@ -112,9 +110,16 @@ async def anthropic_complete_if_cache(
verbose_debug(f"System prompt: {system_prompt}")

try:
response = await anthropic_async_client.messages.create(
model=model, messages=messages, stream=True, **kwargs
)
create_params = {
'model': model,
'messages': messages,
'stream': True,
**kwargs
}
if system_prompt:
create_params['system'] = system_prompt
response = await anthropic_async_client.messages.create(**create_params)

except APIConnectionError as e:
logger.error(f"Anthropic API Connection Error: {e}")
raise
Expand All @@ -135,7 +140,7 @@ async def stream_response():
async for event in response:
content = (
event.delta.text
if hasattr(event, "delta") and event.delta.text
if hasattr(event, "delta") and hasattr(event.delta, "text") and event.delta.text
else None
)
if content is None:
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