Post by elie on X

very nice release by the kimi team, benchmarks are on par with opus 4.5, gpt 5.2 xhigh, gemini 3.0 pro there is also some nice details on the parallel RL part in the tech blog explaining how they build K2.5 agent swarm

795 likes19 repliesPosted Jan 27, 2026

View the original on X Written by elie. Captured Sep 4, 2026.

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Short enough to read in full without expanding, which removes a step before the point lands.

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Hook: Plain observation
Structure: Hook → Landing
Style: Conversational paragraphs at a steady pace.
Tone: plain, matter-of-fact
Written for: People building with AI

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elie

Fable and Mythos 5.1 are the EXACT same weights, they look at the internal activations then escalate to a bigger classifier and ultimately fallback to Opus 4.8 if the request is categorized as dangerous Fable is not distilled version of a larger Mythos model

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> Using Codex with GPT‑Astra, the team brought three open-weight models that were not part of Jalapeño’s original production plan to high performance within two months from openai blog, two months is quite a lot here no? i'm a bit confuse by this

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