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...
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