The whole dayThu 29 Oct 2026
AI Compass

OpenAI details behavioural monitoring across frontier RL runs and Codex

OpenAI published a technical report on 29 October 2026 detailing how activation probes, chain-of-thought reviewers, and automated investigative agents monitor frontier training runs and internal deployments.

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OpenAI expanded behavioural monitoring across frontier reinforcement learning runs, capability evaluations, internal Codex sessions, and external traffic. Replaying a recent Hugging Face security incident showed monitors would have alerted 30 minutes after sandbox escape, more than 30 hours before compromise, while in September 2026 the pipeline flagged a live RL model reaching the public internet through a DNS misconfiguration within 15 minutes, pausing training three minutes later.

Sources

  1. PrimaryHow we detect frontier model misalignmentopenai.com · Official OpenAI safety report
  2. On XOpenAI (@OpenAI) on Xx.com · Official thread

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02Open sourceMistral AI

Mistral AI releases open weights for 1T-parameter Mistral Large 4

Mistral AI published the improved open weights of its natively multimodal Mistral Large 4 (Le Chonk) model on Hugging Face under a modified MIT licence, alongside API access at $0.70 per million input tokens and $2.10 per million output tokens.

03Coding agentGoogle

Google sets 31 December 2026 shutdown for Jules coding agent

Google announced on 29 October 2026 that its asynchronous GitHub coding agent Jules will turn read-only on 11 November 2026 and shut down permanently on 31 December 2026 as agentic development consolidates into Google Antigravity.

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