Kimi

Kimi K3.1 Pro is the first model in Moonshot's K3.1 series, released October 23, 2026. Moonshot calls it the most capable model in its 3-trillion-parameter class, with a 1 million token context. Reasoning is always on, at low, high or max effort, and the default is max. The API model id is kimi-k3.1-pro. A Highspeed variant, which Moonshot says writes about two to three times faster, is sold separately. Moonshot says the full weights will be published by November 4. On Moonshot's own Terminal-Bench 4.0 chart, K3.1 Pro scores 65.7 percent, against 58.2 percent for GPT-6 Astra and 66.4 percent...

Kimi K3 is Moonshot AI's open-weight model released July 16, 2026, built at roughly 2.8 trillion parameters. It's available now via kimi.com, Kimi Work, Kimi Code, and the Kimi API, priced at $0.30 per million input tokens (cached), $3.00 per million (uncached), and $15.00 per million output tokens. Moonshot published the full open weights on Hugging Face on July 27, 2026, as promised at launch. Moonshot positions it as approaching Anthropic Fable 5-tier performance at a fraction of the cost, though the company acknowledges a tendency toward 'excessive proactivity' on long-running tasks.

Kimi k1.5 is a multimodal large language model from Moonshot AI, specifically engineered for high-fidelity technical reasoning and long-context processing. It is a key player in the 'DeepSeek movement,' matching the reasoning performance of frontier models like GPT-5.2 Codex and Claude 4.5 while remaining significantly more cost-effective. It features a massive 2 million token context window and joint text-vision reasoning, making it ideal for complex coding, mathematical proofs, and large-scale document analysis. The model is built using advanced Reinforcement Learning (RL) to achieve deep...