Kimi K2.8 Preview is presented as a coding-focused model with performance described as close to K3, but with more efficient reasoning. Its model ID is kimi-for-coding. It runs at regular speed, supports a context window of up to 1,048,576 tokens and accepts image and video input. Reasoning effort can be set to low, high, or max, with max as the default. The model is available to Plus-and-above members on new plans and Andante-and-above members on legacy plans. The guide places it alongside K3.1 Pro, K3, a shorter-context K3 variant, and K2.7 Code Highspeed, whose faster output comes with higher quota use.
Model selection is available through the model picker in Kimi Code Desktop, the CLI’s /model command, or the VS Code extension; third-party tools can connect through OpenAI-compatible or Anthropic-compatible APIs. The guide recommends using the exact model ID and keeping the same model and reasoning effort throughout a session: changing either invalidates the context cache, adds token use, and may disrupt reasoning continuity. If thinking is disabled for K2.8, requests are routed to K2.8 without thinking; an incorrect model ID may also silently fall back to that mode. API errors can result from plan permissions, unsupported context limits, or thinking settings. Highspeed improves model output only, not tool execution, so tool-heavy tasks may see little overall speedup.
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