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Sprintcyclist
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The Rundown: Chinese AI lab Moonshot just introduced Kimi K3.1 Pro, an upgrade to its July K3 model that it says is “matching the strongest proprietary models” on key benchmarks, with free-to-download weights set to come by Nov. 4.
The details: Artificial Analysis placed it No. 4 overall on its Intelligence Index, beating OpenAI’s GPT-6 Astra and trailing only Anthropic’s 5.5 duo and Meta’s Muse Wonder. In Moonshot’s tests, K3.1 Pro tops Opus 5.5 on hours-long coding projects, expert academic questions, document-heavy research, and real-world job tasks. At $2 in/$10 out per million tokens, K3.1 Pro is priced like Sonnet 5.5, a fifth of Astra’s rate, but consumes tokens at a higher rate than its frontier rivals. AA also ranks it the best openly available cyber-defense model, scoring 64% with no safety refusals, trailing just a GPT-6 variant available only to vetted defenders.
Why it matters: U.S. labs have kept their best hacking models locked down, but a Chinese model now sits just behind OAI’s gated cyber model. Dario Amodei gave defenders 6-12 months in May before Chinese models catch up, and K3.1 Pro is already near the top on defense — with open models’ attack skills also likely not far behind.
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