Moonshot AI releases Kimi K3.1 Pro, intelligence index rises to fourth

1. 08:00
   Fireworks AI BlogFeatured

   Kimi K3.1 Pro is live on Fireworks

   Moonshot AI's Kimi K3.1 Pro is available on Fireworks at launch, either serverless with pay-per-token pricing or on a dedicated deployment for reserved capacity. Moonshot post-trained K3.1 Pro from K3 and replaced K3's full-attention layers with sparse attention to make long contexts more efficient to serve. Fireworks reports it sits on the quality-for-cost frontier on five Specialized Intelligence Index benchmarks, ranking first of 19 on Sierra's τ³-Banking at 64.7%, and lists serverless pricing at $2.00 per million uncached input tokens, $0.20 cached input and $10.00 output.

1. 03:00
   The DecoderFeatured

   Chinese AI model Kimi K3.1 Pro is closing in on Anthropic's Claude Opus 5.5

   Moonshot AI released Kimi K3.1 Pro, a post-trained successor to Kimi K3 that scores 55 points on the Artificial Analysis Intelligence Index, an 11-point gain that places it fourth behind Claude Opus 5.5 (58), Claude Sonnet 5.5 (56) and Muse Wonder Full (56). Moonshot says the model keeps K3's 2.8 trillion total and 104 billion active parameters with a one-million-token context window, cuts token prices by 33 percent, and shows its largest gains on agentic tasks, while cyber-related training data was stripped for the planned open-weights release. A faster K3.1 Pro Highspeed variant is also available through Kimi.ai, Kimi Work, Kimi Code and the Kimi API.

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