Diffusion LLM running at 1,068 tokens per second with frontier-class quality.
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Kimi K3.1 Pro
Moonshot's flagship agentic model with a 1M-token context and open weights on the way.
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What is Kimi K3.1 Pro?
Kimi K3.1 Pro, launched October 23, 2026 by Moonshot AI, is the company's most capable model to date and its first in the new K3.1 series. Built on a 2.8-trillion-parameter architecture with 104 billion active parameters, it offers a 1-million-token context window and is positioned squarely at coding, agentic work, 3D modeling, and financial analysis, with Moonshot reporting a sharp drop in hallucination rate on its own factual-accuracy stress test.
The model is available now in the Kimi chat app and through the Moonshot API, alongside a Highspeed variant the company says runs two to three times faster at the same intelligence level. API pricing undercuts the previous K3 by a third, and Moonshot has committed to publishing the full model weights by November 4, 2026, which would make it one of the most capable open-weight models anyone can download and run.
Key Features
- 1-million-token context window for very long documents and agent sessions
- Agentic coding and tool use, including inside the Kimi Code coding environment
- Highspeed variant offering two to three times faster generation
- Text and image input with strengths in coding, 3D modeling, and financial analysis
- Full open weights promised by November 4, 2026 for self-hosting
Pros
- Near-frontier coding and agent performance at roughly half the API price of the most expensive flagship models
- Huge 1M-token context suits long codebases and multi-step agent workflows
- Imminent open weights give developers a path off per-token pricing entirely
Cons
- The headline benchmark claims are Moonshot's own and independent scores differ by evaluator
- The API has no free tier and needs a minimum $1 top-up before it answers a request
- The full open weights are promised by November 4, 2026, not available yet
Pricing
- Model: Freemium
- Free chat app; API is pay-as-you-go at $2 per 1M input / $10 per 1M output tokens ($0.20 cached input); Highspeed variant $4 / $20 per 1M tokens. A $1 minimum API top-up applies.
Adding Up Your AI Bill?
If you pay for Kimi K3.1 Pro alongside other AI subscriptions, the monthly total adds up quietly. Tick every tool you pay for in our free AI Tool Cost Calculator to see your real monthly and yearly bill — and spot overlaps you can cut. Still choosing? Start with our guide on how to choose the right AI tool.
How We Rated It
Scores reflect our editors’ independent assessment at the time of review.
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