Disable use of tool_choice=required for deepseek-reasoner
#3644
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I've been experimenting with DeepSeek v3.2 recently, and find the reasoner model from the official endpoint yields 400 Bad Request when
openai_supports_tool_choice_requiredis not set to False. That is, deepseek-reasoner does not supporttool_choice=required, at least for now.I'm not sure if it's a provider-specific issue or a model characteristic, so I'm changing the provider side.