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A gpt-5 model accepts a non-default temperature only while its effective reasoning effort resolves to "none". litellm had no representation of the effort a model applies when the request omits reasoning_effort, so it substituted supports_none_reasoning_effort, which is a different fact. Every model that supports "none" without defaulting to it therefore had temperature forwarded and rejected upstream, and because the carve-out returned before the drop_params branch, drop_params: true could not save it. Declare the fact instead. A new cost-map key, default_reasoning_effort, states the effort the provider applies when the request omits one, and one shared predicate resolves the effective effort from it: an explicit reasoning_effort wins, otherwise the declared default, otherwise the catalogue decides. That last step matters because the cost map is fetched from the published branch at import time, so it can be OLDER than the code reading it. On such a map every model looks undeclared, and reading that as "reasoning is active" would strip temperature from the 39 gpt-5.1/5.2/5.4 entries that accept it, a regression caused by data lag rather than by anything about the model. So an absent declaration is only meaningful once the catalogue carries the key at all; a map that predates the feature keeps the answer litellm gave before it existed, and the conservative answer applies from the moment the data lands. The top_p/logprobs/top_logprobs gate carried the same assumption spelled differently and now shares the predicate, as does the Responses API, which reimplemented the rule and is what the default /v1/messages bridge routes openai models through. Azure normalises its routing names in one resolver that every capability lookup goes through, which replaces its bespoke per-lookup rewrite. Declared on the 37 gpt-5.1/5.2/5.4 entries measured to accept temperature=0 today, so their behaviour is unchanged. The 23 gpt-5.5/5.6 entries that reject it stay undeclared and are fixed once the catalogue carries the key. Resolves LIT-3797 Resolves LIT-5028 |
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| .. | ||
| chat | ||
| completion | ||
| embeddings/guardrail_translation | ||
| evals | ||
| image_generation | ||
| realtime | ||
| responses | ||
| speech | ||
| transcriptions | ||
| vector_store_files | ||
| vector_stores | ||
| videos | ||
| test_cost_calculation.py | ||
| test_data_residency.py | ||
| test_gpt5_transformation.py | ||
| test_is_model_gpt_5_model.py | ||
| test_o_series_transformation.py | ||
| test_openai_common_utils.py | ||
| test_openai_empty_response.py | ||
| test_openai_file_content_streaming.py | ||
| test_openai_image_edit_transformation.py | ||
| test_use_chat_completions_api_no_leak.py | ||