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Last Week in AI

Andrey Kurenkov & Jeremie Harris · Weekly · 7 issues since Sep 1 · latest Oct 9

Everything that happened in AI last week — tools, business, research, policy — as a long linked digest, paired with the podcast.

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Oct 9, 2026 · 10 min read

OpenAI publishes hundreds of math proofs from unreleased frontier model, Mistral and Reflection AI launch open-weight models to rival China, and more!

Oct 3, 2026 · 3 min read

(Belated post :/ ) Anthropic releases Opus 5.5 with lower prices and Fable-level performance, OpenAI launches GPT-6 Sol and Luna, boasting lower cost and fewer mistakes

Sep 30, 2026 · 12 min read

Anthropic and OpenAI race to release smarter and cheaper models, OpenAI discloses nine misalignment incidents, and more!

Sep 24, 2026 · 4 min read

A belated discussion of Astra’s release, a bunch of AI incidents, and the broader situation we are in with regards to AI safety.

Sep 17, 2026 · 16 min read

OpenAI claims a Millennium Prize proof amid a feud with mathematicians, Anthropic's CEO calls to pace the frontier, extinction warnings spur a regulation push, and more!

Sep 9, 2026 · 3 min read

Anthropic launches Claude Fable 5.1, OpenAI Is About (already has) to Release Its First AI Model With ‘Critical’ Cyber Abilities, OpenAI’s rogue AI model incident was worse than we thought

Sep 7, 2026 · 12 min read

GPT-6 Astra Is Here, Discovery of a new OpenAI agent message board, Anthropic launches Claude Fable 5.1 and says it’s up to 45 percent cheaper for agentic work, and more!