Kimi K3.1 Pro launches with 2.8T params beating Fable 5.1, open weights due Nov 4

Latent Space · rss · 2026-10-24

Latent Space's AINews covers Moonshot's Kimi K3.1 Pro launch:

Specs: multimodal MoE with 2.8T total / 104B active params and 1M-token context; open weights promised Nov 4, 2026 (API-only for now).
Independent evals: scores 55 on Artificial Analysis' Intelligence Index (#4, behind Opus 5.5's 58), with agentic gains outpacing knowledge/science; #8 in Code Arena WebDev (1,692 pts, up from #17); 64% on Cyber Index — the highest publicly accessible score.
Highspeed API: claimed 2-3× faster output at 2× the cost.
Caveats: 'open' is unproven until weights drop (license, precision unknown); 2.8T params imply 5.6TB at 16-bit, so "local" claims need accelerator infra. Controversies over inference economics, weaker interactive tasks, and alleged undisclosed paid promotion are separate issues.
If released as promised, AA estimates the open-vs-proprietary gap narrows from 12 to 3 points; Simon Willison calls it the first credible open-weight frontier contender.

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