Fable-5.1-Class Open Weights

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Latest developments

[AINews] Kimi 3.1 Pro 104BA-2.8T: Fable-5.1-Class Open Weights narrows Closed-AI lead to 1 month... and Pro Highspeed API with 2-3× speed Latent Space · 4 hours ago · 35

Timeline

Month Quarter Year

October 2026

Moonshot AI releases Kimi K3.1 Pro through its API ahead of planned open-weight availability Model release

24 Oct [AINews] Kimi 3.1 Pro 104BA-2.8T: Fable-5.1-Class Open Weights narrows Closed-AI lead to 1 month... and Pro Highspeed API with 2-3× speed

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Competition

Kimi 3.1 Pro 104B-2.8T competes with this model · 1 source

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TLDRocket 24 October 2026

The biggest AI story today is the open-weights comeback—this time with receipts. Moonshot AI shipped Kimi K3.1 Pro, a post-trained 2.8T multimodal mixture-of-experts model, and positioned it against the leading proprietary systems on benchmarks that matter to product teams. Artificial Analysis’s Intelligence Index gave it 55 points, which puts it just behind Claude Opus 5.5 and Claude Sonnet 5.5; Moonshot says that if it publishes weights by early November, the best open-vs-best closed gap shrinks from 12 points to 3. NVIDIA, meanwhile, added Nemotron 3.5 Bolt E4B, an open small language model designed to run in local voice-agent setups, targeting a 4GB VRAM envelope with 8B total parameters (4B effective) and a 64K context window.

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