No matter how many times I read this, it still blows my mind. Fable has been a HUGE leap forward for AI progression. For 6 years, AI was doubling task length every ~7 months. With Mythos (Fable)-class models, it's now doubling every ~4 months! GPT-2 (2019): ~3 seconds GPT-4 (2023): ~4 minutes Claude Sonnet 3.7 (early 2025): ~50 minutes Claude Opus 4.5 (Dec 2025): ~5 hours Claude Opus 4.6 (Feb 2026): ~14.5 hours And Fable 5 (Jun 2026): ~30 hours I can't even fathom where we'll be in 12 months' time...(Miles Deutscher)