Reasoning-related fields

Reasoning models may return reasoning_content, reasoning, thinking, or ... wrapped content. Field names vary by model route and model.

Field / form	Possible source	Handling
delta.reasoning_content	Reasoning models such as DeepSeek	Show separately or collapse it.
reasoning / thinking	Gemini or compatible routes	Do not assume every model has it.
...	Some compatible or reverse routes	Filter in the UI if you do not show reasoning.
delta.content	Final answer content	Primary user-facing text.