AI
Introducing the Kimi K3.1 Pro
Publication: Simon Willison's Weblog
Author: Not available in collected metadata
Source published: 23/10/2026, 19:40:54 UTC
Briefing created: 23/10/2026, 20:09:53 UTC
Based on a feed excerpt; full article content has not been acquired. Source evidence retrieved 23/10/2026, 19:42:24 UTC.
Briefings
Moonshot AI launched Kimi K3.1 Pro on October 23, 2026, with full weights released by November 4, 2026. The model offers a 'Highspeed' variant at twice the price but with 2-3x speed. Pricing is $2.00/million tokens for input and $10/million for output, matching GPT-6.1 Sol and half the cost of Claude Opus 5.5. Benchmarks place Kimi near GPT-6 Astra and Opus 5.5, scoring 55 on Artificial Analysis compared to 53 for others. A test run generated SVGs of pelicans riding bicycles using the Moonshot API.
Key points
- Kimi K3.1 Pro launched on October 23, 2026 with full weights scheduled for November 4, 2026.
- The Highspeed version offers 2-3x speed at double the price, priced at $2.00/million tokens for input and $10/million for output.
Context
Moonshot AI is a Chinese company providing generative AI services. Kimi K3.1 Pro is their latest open-weight model, competing directly with GPT-6.1 and Claude Opus 5.5 in the market.
Limitations
Benchmarks are from Artificial Analysis as of October 2026. The test run used the Moonshot API with specific parameters and did not log results. Future performance on other tasks remains unverified.
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