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Try nowModels·IncrementalOfficialstableUpdated Oct 23·Updated 1×·First seen Nov 3
Moonshot AI Launches Kimi K3.1 Pro with API Access and Performance Competitive with Claude Opus 5.5
LaunchBenchmarkOpen source
Try it
Something you can actually use or run today.
On October 23, 2026, Moonshot AI launched the Kimi K3.1 Pro model on their API, including a high-speed variant.
It offers an OpenAI-compatible alternative for high-end reasoning, though its real value depends on the promised open weights arriving.
AILookup take
The API compatibility is a smart move for adoption, but we have seen many promised open-weights releases stall or underperform. Until the weights actually hit GitHub, this is just another high-performance API in a crowded market.
Who cares
local LLM enthusiastsAsian market developerscost-conscious API users
Watch next
The actual release of the weights on November 4, 2026.
Also covers
- Moonshot AI Launches Kimi k3.1 Pro with Weights Coming SoonOn October 23, 2026, Moonshot AI launched the Kimi K3.1 Pro model through its API, alongside a faster 'Highspeed' variant.
Details
- First frontier-level model to commit to an open weights release.
- API is OpenAI-compatible, facilitating seamless integration for existing developer workflows.
- Provides a high-performance alternative for local or self-hosted deployment once weights become available.
Consensus
Sources agree on the API launch date of October 23, 2026, and the upcoming public weights release date of November 4, 2026.
Related articles (1)
Introducing Kimi K3.1 ProSimon Willison· 1 stories
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