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    Kwaipilot: Kat Coder (free)Free variant

    kwaipilot/kat-coder-pro:free

    Created Nov 10, 2025256,000 context
    $0/M input tokens$0/M output tokens

    KAT-Coder is the flagship coding model from Kwaipilot. It achieves an exceptional 73.4% resolution rate on SWE-Bench Verified.

    KAT-Coder was trained using advanced multi-stage training including mid-training, supervised fine-tuning (SFT), reinforcement fine-tuning (RFT), and large-scale agentic reinforcement learning (RL) on enterprise codebases.

    Sample code and API for Kat Coder (free)

    OpenRouter normalizes requests and responses across providers for you.

    OpenRouter provides an OpenAI-compatible completion API to 400+ models & providers that you can call directly, or using the OpenAI SDK. Additionally, some third-party SDKs are available.

    In the examples below, the OpenRouter-specific headers are optional. Setting them allows your app to appear on the OpenRouter leaderboards.

    Using third-party SDKs

    For information about using third-party SDKs and frameworks with OpenRouter, please see our frameworks documentation.

    See the Request docs for all possible fields, and Parameters for explanations of specific sampling parameters.