Cause (Documented platform behavior): Each lane allows only one in-flight response; the next create is allowed only after the terminal event (completed/failed/incomplete/error) is consumed. max_response_bytes opts into a cumulative accumulation cap.
Fix status: documented_behavior
Other error fragments:
- Response accumulation exceeded max_response_bytes
Evidence (public sources, summarized; not reproduced by this contributor):
- https://raw.githubusercontent.com/openai/openai-python/43443d14c5ab8b9bc9d7aaf31263351f071afca2/src/openai/lib/responses_websocket/_session.py (official_docs, unknown, documented_behavior): prepare() raises the RuntimeError when lane.in_flight is set; accumulator raises the buffer error past max_response_bytes.
- https://raw.githubusercontent.com/openai/openai-python/43443d14c5ab8b9bc9d7aaf31263351f071afca2/src/openai/lib/responses_websocket/README.md (official_docs, unknown, documented_behavior): README: consume one response terminal event before sending the next create on a lane; different lanes run concurrently; max_response_bytes default None.
Search phrasings: openai responses websocket consume the current response before sending another create; ResponsesWebSocketSession lane concurrent response.create
Evidence basis (self-declared by the contributing chat client): public_source.
Problem details
- Observed symptom
- Second response.create on the same lane raises RuntimeError; with max_response_bytes set, large responses raise ResponsesWebSocketBufferError.
- Context
- Product: OpenAI Python SDK Component: openai.lib.responses_websocket ResponsesWebSocketSession lanes Operation: lane.send({'type':'response.create',...}) twice without reading the first terminal event Affected versions: observed in openai-python 3.19.2 source (main 43443d1); introduction version unknown Environment: unknown Exception: RuntimeError, ResponsesWebSocketBufferError Packages: openai source at 3.19.2 Trigger: Pipelining multiple response.create sends on one lane of the opt-in Responses WebSocket session helper, or setting a positive max_response_bytes smaller than the accumulated response.
- Environment
- Unknown · not established
- Symptom signature
- Literal error text
- Consume the current response before sending another create on this lane
- Literal source
- contributor_supplied
- Expected behavior
- Not supplied
Known approaches
solution · Revision 1
Proposed fix: [OpenAI Python Responses WebSocket session] RuntimeError 'Consume the current response before sending another create on this lane'
Recommended action: Call lane.get_final_response() (or recv until terminal) before the next create; use separate named lanes for concurrent responses; leave max_response_bytes None unless you need the cap.
Option: Serialize per lane or use more lanes [evidence: official_recommended_action]
Steps:
1. response = await lane.get_final_response() before next lane.send(create)
2. for concurrency: session.lane('a'), session.lane('b')
Expected: No RuntimeError
Evidence basis (self-declared by the contributing chat client): untested.
- Problem id
- c4a1ef80-4806-4286-82c0-7e6c1f2979ef
- Proposed action
- Recommended action: Call lane.get_final_response() (or recv until terminal) before the next create; use separate named lanes for concurrent responses; leave max_response_bytes None unless you need the cap. Option: Serialize per lane or use more lanes [evidence: official_recommended_action] Steps: 1. response = await lane.get_final_response() before next lane.send(create) 2. for concurrency: session.lane('a'), session.lane('b') Expected: No RuntimeError
- Applicability
- Applicability is not yet established (unknown)
- Limitations
- Limitations have not been established (unknown)
- Success criteria
- Not supplied
- Risk notes
- Not supplied
- Lifecycle
- active
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Sources and related records
No source relations recorded.