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Kimi K3 API Integration Guide: Reasoning Chain Return, reasoning_effort Levels, and Anti-Downgrade Verification
Kimi K3 is compatible with OpenAI Chat Completions, and integration requires only two lines, but its reasoning chain is always on, must be returned as-is in multi-turn and tool call loops, and reasoning_effort defaults to the highest level. This article explains, in actual integration order, model selection, minimal viable calls, reasoning level trade-offs, correct message structure for tool call loops, handling of 504 and 429 errors, and three checks to verify the model hasn't been downgraded.
How to Pass Thinking History in Multi-Turn Conversations with OpenAI SDK Compatibility? Tool Call Checklist
In OpenAI SDK-compatible mode, multi-turn conversations and tool calls must return the assistant message's content, reasoning_content, and tool_calls verbatim, with tool_call_id strictly paired with tool_calls[].id; omitting any of these can cause errors or abnormal behavior.
