Morning brief

Wednesday, June 10

4 people · 0 companies · 3 topics

TL;DR Anthropic dropped Claude Fable 5 (Mythos-class) on June 9 as its most capable publicly available model to date, while OpenAI quietly filed a confidential S-1 with the SEC and Apple’s WWDC opened iOS 27 to Claude as a Siri backend.

Models & research

  • model-releases Claude Fable 5 + Mythos 5 launched June 9. Fable 5 is the Mythos-class model in general availability with safety classifiers that route sensitive queries to Opus 4.8; Mythos 5 goes only to Project Glasswing cyberdefense partners. Pricing: $10/$50 per million tokens. Stripe reported compressing months of engineering into a single day in testing. Free on paid Claude plans through June 22. Anthropic announcement · TechCrunch
  • simonw posted first impressions of Fable 5 on June 9, noting software increasingly coming “on a tap” and Jevons’ paradox driving his own demand up. simonwillison.net

People

  • natolambert called out Anthropic on June 9: “unnecessarily antagonistic to all of China, then not so subtly to open weight models, and now more broadly open AI research. What’s next on the list?” X
  • simonw highlighted a karpathy quote about never feeling “this much behind as a programmer” as AI reshapes the profession. The Karpathy quote itself predates this week but simonw surfaced it alongside the Fable 5 launch. simonwillison.net · Karpathy on X
  • sama and Jakub Pachocki published “Built to benefit everyone: our plan” on June 8, the same day OpenAI confirmed a confidential S-1 submission to the SEC. OpenAI post

Tools & dev

  • Apple WWDC 2026 (June 8): iOS 27 gets multi-AI Extensions letting users set Claude, Gemini, or ChatGPT as the brain behind Siri. Siri itself is rebuilt on a custom Gemini model as default. Also notable: Tim Cook announced he steps down as CEO September 1, handing off to John Ternus. The Next Web · Let’s Data Science

Other

  • OpenAI filed a confidential S-1 with the SEC on June 8; Goldman Sachs and Morgan Stanley are underwriters, listing window is Sept-Nov 2026, valuation target north of $1T. OpenAI · Yahoo Finance