KwaiPilot: KAT-Coder-Pro V1
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KAT-Coder-Pro V1 is KwaiKAT's most advanced agentic coding model, built by Kuaishou's Kwaipilot team and designed specifically for real-world software engineering tasks.
It achieves a 73.4% solve rate on SWE-Bench Verified, reflecting strong performance on practical code generation and bug-fixing scenarios. The model has been optimized for tool-use capability, multi-turn interaction, and instruction following through a multi-stage training pipeline that includes supervised fine-tuning, reinforcement fine-tuning, and agentic RL.
KAT-Coder-Pro V1 supports multi-tool parallel invocation, enabling it to complete complex agentic workflows with fewer interaction rounds. It offers a 256K-token context window and up to 128K output tokens. It's a text-only, non-reasoning model — so expect direct responses without chain-of-thought overhead, well-suited for coding agents and automated engineering pipelines.
Context Window N/A
tokens
Max Output 128K
tokens
Input Cost $0.21
per million tokens
Output Cost $0.83
per million tokens
Release Date Sep 1, 2025
Code Example
Add AI to your app with the Puter.js AI API — no API keys or setup required.
// npm install @heyputer/puter.js
import { puter } from '@heyputer/puter.js';
puter.ai.chat("Explain quantum computing in simple terms").then(response => {
document.body.innerHTML = response.message.content;
});
<html>
<body>
<script src="https://js.puter.com/v2/"></script>
<script>
puter.ai.chat("Explain quantum computing in simple terms").then(response => {
document.body.innerHTML = response.message.content;
});
</script>
</body>
</html>
More AI Models From KwaiPilot
KAT-Coder-Pro V2.5
KAT-Coder-Pro V2.5 is Kwaipilot's (Kuaishou's AI research division) successor to KAT-Coder-Pro V2, an agentic coding model built on a Mixture-of-Experts architecture with 72B active parameters. It offers a 256K token context window with up to 80K output tokens, and is trained through large-scale agentic reinforcement learning using reconstructed, verifiable repository environments rather than scale alone. On repository-level software engineering benchmarks, KAT-Coder-Pro V2.5 scores 65.2 on SWE-Bench Pro, ranking second only to Opus 4.8 (69.2). It posts the best agentic tool-use result among tested models on PinchBench (94.9), reflecting strength in long-horizon, multi-step tasks. The model is designed to take on an entire issue or business workflow autonomously, locating problems, making changes, and completing tasks inside real repositories. It also has a lighter sibling variant, KAT-Coder-Air V2.5, for lower-cost workloads.
ChatKAT-Coder-Air V2.5
KAT-Coder-Air V2.5 is a coding-focused agentic model from Kwaipilot (Kuaishou's AI research division), released July 10, 2026 as the faster, lower-cost sibling to KAT-Coder-Pro V2.5. It shares Pro's 256K context window and 80K max output tokens, priced at $0.15 per 1M input tokens and $0.60 per 1M output tokens, roughly a fifth of Pro's $0.74/$2.96 rates. The model is built for agent and tool-use workflows inside real, executable repositories, handling issue localization, code modification, and test execution as part of an end-to-end development loop. Kwaipilot designed it for interactive development and rapid iteration rather than single-shot generation, with integration into toolchains such as Claude Code and OpenHands. It supports function calling, tool use, structured JSON output, and prompt caching. KAT-Coder-Air V2.5 targets teams running high-volume coding agents and workflow automation where speed and cost per request matter, while KAT-Coder-Pro V2.5 remains Kwaipilot's higher-capability option for complex software engineering tasks.
ChatKAT-Coder-Pro V2
KAT-Coder-Pro V2 is the flagship agentic coding model from Kwaipilot (Kuaishou's AI research division), built for enterprise-grade software engineering and SaaS integration. It uses a Mixture-of-Experts architecture with 72B active parameters and offers a 256K token context window. The model achieves a 79.6% solve rate on SWE-Bench Verified, placing it among the top code generation models globally. It scores 44 on the Artificial Analysis Intelligence Index, well above the median of 15 for comparable non-reasoning models in its price tier, and generates output at roughly 109 tokens per second. KAT-Coder-Pro V2 is designed for large-scale production environments, multi-system coordination, and agentic coding workflows. It also supports tool use, function calling, and web aesthetics generation for producing landing pages and presentation decks.
Frequently Asked Questions
You can access KAT-Coder-Pro V1 by KwaiPilot through Puter.js AI API. Include the library in your web app or Node.js project and start making calls with just a few lines of JavaScript — no backend and no configuration required. You can also use it with Python or cURL via Puter's OpenAI-compatible API.
Yes, it is free if you're using it through Puter.js. With the User-Pays Model, you can add KAT-Coder-Pro V1 to your app at no cost — your users pay for their own AI usage directly, making it completely free for you as a developer.
| Price per 1M tokens | |
|---|---|
| Input | $0.21 |
| Output | $0.83 |
KAT-Coder-Pro V1 was created by KwaiPilot and released on Sep 1, 2025.
KAT-Coder-Pro V1 can generate up to 128K tokens in a single response.
Yes — the KAT-Coder-Pro V1 API works with any JavaScript framework, Node.js, or plain HTML through Puter.js. Just include the library and start building. See the documentation for more details.
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