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Introducing Kimi K3.1 Pro

Blog · Watch/Read · (gathered 2026-10-29)

  • Simon Willison introduces Moonshot’s Kimi K3.1 Pro, a new frontier-level model notable for its competitive performance against top proprietary models and its unique promise of open weights by November 2026.
  • Kimi K3.1 Pro is priced at $2/million input and $10/million output tokens (matching GPT-6.1 Sol), and Artificial Analysis scored it 55, placing it just behind Claude Opus 5.5 (58) and ahead of GPT-6 Astra.
  • This release is significant as it marks the first time a “soon-to-be” open weight model has achieved such high benchmark scores against leading frontier models, potentially impacting the open-source AI landscape.
  • Simon demonstrates interacting with Kimi K3.1 Pro via the Moonshot API using his llm openai endpoint command, showcasing its reasoning_effort levels with an SVG generation prompt.