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Second HorizonSecond Horizon

Weekly

The briefings

What happened in AI each week and what it means for running a company. Recorded on Saturday, published on Sunday morning.

Written edition

September 13, 2026

Second Horizon briefing, week of September 7, 2026

  • OpenAI launches GPT-6 Astra across enterprise platforms
  • Anthropic releases Claude Fable 5.1 with price cuts
  • Enterprise AI token usage shifts to multiplayer agent loops
  • Open-weight models gain enterprise market share and compression
  • and 2 more