KwaiPilot API
Access KwaiPilot instantly with Puter.js, and add AI to any app in a few lines of code without backend or API keys.
// npm install @heyputer/puter.js
import { puter } from '@heyputer/puter.js';
puter.ai.chat("Explain AI like I'm five!", {
model: "kwaipilot/kat-coder-pro-v2.5"
}).then(response => {
console.log(response);
});
<html>
<body>
<script src="https://js.puter.com/v2/"></script>
<script>
puter.ai.chat("Explain AI like I'm five!", {
model: "kwaipilot/kat-coder-pro-v2.5"
}).then(response => {
console.log(response);
});
</script>
</body>
</html>
List of KwaiPilot Models
KAT-Coder-Pro V2.5
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
kwaipilot/kat-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
kwaipilot/kat-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.
ChatKAT-Coder-Exp-72B-1010
kwaipilot/kat-coder-exp-72b-1010
KAT-Coder-Exp-72B-1010 is an experimental 72B coding model from Kwaipilot, Kuaishou's AI coding team, released October 10, 2025 as a reinforcement-learning research snapshot of the KAT-Coder line. Kwaipilot published it to show the large-scale agentic RL training behind its production KAT-Coder models. It scores 74.6% on SWE-Bench Verified under the SWE-agent scaffold, which Kwaipilot reported as the top result among open models at release. The model is built for repository-level software engineering, reading and editing real codebases, resolving GitHub-style issues, and operating inside agent scaffolds over long trajectories. It supports tool calling, covers more than 20 programming languages, and works with coding agents such as Claude Code and Cline. As an experimental snapshot rather than a production release, it fits low-cost agentic coding experiments and evaluation, while the KAT-Coder-Pro line remains Kwaipilot's production option.
ChatKAT-Coder-Pro V1
kwaipilot/kat-coder-pro
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.
Frequently Asked Questions
The KwaiPilot API gives you access to models for AI chat. Through Puter.js, you can start using KwaiPilot models instantly with zero setup or configuration.
Puter.js supports a variety of KwaiPilot models, including KAT-Coder-Pro V2.5, KAT-Coder-Air V2.5, KAT-Coder-Pro V2, and more. Find all AI models supported by Puter.js in the AI model list.
With the User-Pays model, users cover their own AI costs through their Puter account. This means you can build apps without worrying about infrastructure expenses.
Puter.js is a JavaScript library that provides access to AI, storage, and other cloud services directly from a single API. It handles authentication, infrastructure, and scaling so you can focus on building your app.
Yes — the KwaiPilot API through Puter.js works with any JavaScript framework, Node.js, or plain HTML. Just include the library and start building. See the documentation for more details.