Charlie Doern b1851dc9ef feat: add reasoning and reasoning_content fields to OpenAI message types ... Add support for reasoning fields in OpenAI-compatible chat completion messages to enable compatibility with vLLM reasoning parsers. Changes: - Add `reasoning_content` and `reasoning` fields to OpenAIAssistantMessageParam - Add `reasoning` field to OpenAIChoiceDelta (reasoning_content already existed) Both field names are supported for maximum compatibility: - `reasoning_content`: Used by vLLM ≤ v0.8.4 - `reasoning`: New field name in vLLM ≥ v0.9.x vLLM documentation recommends migrating to the shorter `reasoning` field name, but maintains backward compatibility with `reasoning_content`. These fields allow reasoning models to return their chain-of-thought process alongside the final answer, which is crucial for transparency and debugging with reasoning models. References: - vLLM Reasoning Outputs: https://docs.vllm.ai/en/stable/features/reasoning_outputs/ - vLLM Issue #12468: https://github.com/vllm-project/vllm/issues/12468 Signed-off-by: Charlie Doern <cdoern@redhat.com>		2025-12-01 14:32:30 -05:00
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stainless	feat: add reasoning and reasoning_content fields to OpenAI message types	2025-12-01 14:32:30 -05:00