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Mistral's Leanstral 1.5 solves 587 of 672 Putnam problems as GPT-5.6 rumors swell

Wednesday, July 8, 2026 · what moved in the AI release cycle in those 24 hours.

Mistral released Leanstral 1.5, an open model reported to have solved 587 of 672 Putnam math problems, the day's one confirmed launch. Meanwhile, rumor volume around OpenAI's GPT-5.6 intensified, with community posts suggesting a release is imminent and crowd guesses moving 13 days earlier to July 22. Separately, reports say CISA is using Anthropic's Mythos to scan US government software for flaws.

An AI summary of the day’s tracked items. It may contain errors; every item below links to its source.

Top stories

  1. 1

    Mistral Releases Leanstral 1.5, an Open Model That Solved 587 of 672 Putnam Math Problems - DevOps.com

    A confirmed open-model release with a striking reported result on Putnam math problems is the day's most concrete development.

    Leanstral 1.5 · Mistral AI

  2. 2

    CISA Reportedly Using Anthropic’s Mythos to Scan Government Software for Flaws - SecurityWeek

    A US cybersecurity agency reportedly deploying Anthropic's Mythos to audit government software signals real-world institutional adoption of frontier models.

    Claude Mythos 5 · Anthropic

  3. 3

    When OpenAI staff start posting stuff like this, it’s basically confirmed: release day is here. https://t.co/dsnCN3S7t7Rumor

    Rumors of an imminent GPT-5.6 release, echoed by multiple posts and an earlier-shifting crowd estimate, are unconfirmed but worth watching.

    ChatGPT 5.6 · @kimmonismus

Picked by AI from the day’s tracked items; every link goes to the source.

Crowd-guess shifts

Where the community’s average release-date guess moved since yesterday.

  • GPT-5.6 Sol moved 13 days earlier to 2026-07-22 (2 guesses)

News & rumors added

Every story we’re tracking →