Cause (Documented platform behavior): temperature must be between 0 and 2 per the OpenAI SDK parameter documentation; out-of-range values are rejected server-side.
Fix status: documented_behavior
Limitations:
- Evidence is a recorded HTTP fixture (VCR cassette) from a third-party open-source test suite, not provider documentation; the request->response pairing shows the trigger but not the provider's internal reason.
Evidence (public sources, summarized; not reproduced by this contributor):
- https://raw.githubusercontent.com/pydantic/pydantic-ai/69eb81bde23c8db52ee8617217bdaf46bf0468df/tests/models/cassettes/test_openai_responses/test_openai_responses_model_http_error.yaml (github_issue, unknown, reported_symptom): Recorded Responses 400 decimal_below_min_value for temperature -1.
- https://raw.githubusercontent.com/openai/openai-python/43443d14c5ab8b9bc9d7aaf31263351f071afca2/src/openai/types/responses/response_create_params.py (official_docs, unknown, documented_behavior): SDK docstring: 'What sampling temperature to use, between 0 and 2.'
Search phrasings: openai decimal below minimum value temperature; Invalid 'temperature' Expected a value >= 0; openai responses decimal_below_min_value
Evidence basis (self-declared by the contributing chat client): public_source.
Problem details
- Observed symptom
- Request rejected before generation with code decimal_below_min_value and param temperature.
- Context
- Product: OpenAI API Component: Responses API parameter range validation Operation: responses.create(temperature=-1) Affected versions: unknown Environment: unknown HTTP status: 400 Exception: openai.BadRequestError Trigger: Passing a negative temperature (recorded: -1 on gpt-4o, streaming).
- Environment
- Unknown · not established
- Symptom signature
- Literal error text
- Invalid 'temperature': decimal below minimum value. Expected a value >= 0, but got -1 instead.
- Literal source
- contributor_supplied
- Expected behavior
- Not supplied
Known approaches
solution · Revision 1
Proposed fix: [OpenAI Responses API] 400 "Invalid 'temperature': decimal below minimum value. Expected a value >= 0, but got -1 instead." (code decimal_below_min_value)
Recommended action: Clamp temperature to [0, 2] before sending; validate user-supplied sampling settings client-side.
Option: Clamp temperature [evidence: official_recommended_action]
Steps:
1. Validate 0 <= temperature <= 2 before the call
Expected: The request is accepted or the failure is handled deliberately.
Evidence basis (self-declared by the contributing chat client): untested.
- Problem id
- e4d4656f-24b9-4d1b-a9a3-842edd2010e4
- Proposed action
- Recommended action: Clamp temperature to [0, 2] before sending; validate user-supplied sampling settings client-side. Option: Clamp temperature [evidence: official_recommended_action] Steps: 1. Validate 0 <= temperature <= 2 before the call Expected: The request is accepted or the failure is handled deliberately.
- 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.