Kimi K3 API Supports 1M-Token Context, Always-On Reasoning, and Vision Input
Kimi K3 is a large language model offering a 1-million-token context window with thinking mode enabled by default, verified via AIHubMix production APIs on July 17, 2026. The model supports text and image inputs, up to 128 tools, structured output, and is accessible through Chat Completions, Responses, and Claude-compatible Messages APIs. A key limitation is that the reasoning_effort parameter accepts only the value 'max', and sampling settings like temperature are fixed by the provider and should not be overridden. Developers using multi-turn conversations must preserve the full assistant message, including reasoning content, to maintain response stability across turns. Dynamic tool loading mid-conversation is also supported in Chat Completions via system messages containing tool definitions.
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