KwaiPilot: KAT-Coder-Air V2.5
kwaipilot/kat-coder-air-v2.5
Access KAT-Coder-Air V2.5 from KwaiPilot using Puter.js AI API.
Get Started// npm install @heyputer/puter.js
import { puter } from '@heyputer/puter.js';
puter.ai.chat("Explain quantum computing in simple terms", {
model: "kwaipilot/kat-coder-air-v2.5"
}).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", {
model: "kwaipilot/kat-coder-air-v2.5"
}).then(response => {
document.body.innerHTML = response.message.content;
});
</script>
</body>
</html>
# pip install openai
from openai import OpenAI
client = OpenAI(
base_url="https://api.puter.com/puterai/openai/v1/",
api_key="YOUR_PUTER_AUTH_TOKEN",
)
response = client.chat.completions.create(
model="kwaipilot/kat-coder-air-v2.5",
messages=[
{"role": "user", "content": "Explain quantum computing in simple terms"}
],
)
print(response.choices[0].message.content)
curl https://api.puter.com/puterai/openai/v1/chat/completions \
-H "Content-Type: application/json" \
-H "Authorization: Bearer YOUR_PUTER_AUTH_TOKEN" \
-d '{
"model": "kwaipilot/kat-coder-air-v2.5",
"messages": [
{"role": "user", "content": "Explain quantum computing in simple terms"}
]
}'
Model Card
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.
Context Window 256K
tokens
Max Output 80K
tokens
Input Cost $0.15
per million tokens
Output Cost $0.6
per million tokens
Release Date Jul 10, 2026
Model Playground
Try KAT-Coder-Air V2.5 instantly in your browser.
This playground uses the Puter.js AI API — no API keys or setup required.
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-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-Air V2.5 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-Air V2.5 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 | $0.15 |
| Output | $0.6 |
KAT-Coder-Air V2.5 was created by KwaiPilot and released on Jul 10, 2026.
KAT-Coder-Air V2.5 supports a context window of 256K tokens. For reference, that is roughly equivalent to 512 pages of text.
KAT-Coder-Air V2.5 can generate up to 80K tokens in a single response.
Yes — the KAT-Coder-Air V2.5 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.
Get started with Puter.js
Add KAT-Coder-Air V2.5 to your app without worrying about API keys or setup.
Read the Docs View Tutorials