The new Fable 5.1 built three games and did it 7% cheaper!
We gave the same prompts through Atomic Agent:
✦ Sticky ball that rolls up everything in its path
✦ Capybara surfing down a river, Subway Surfers style
✦ Dumpling running an endless conveyor dodge
Outputs:
✦ Claude Fable 5, via Atomic Agent: $7.65
✦ Claude Fable 5.1, via Atomic Agent: $7.08
Run it through an agent and that cache discount is where the money hides. The loop reads the file, watches it break, and pulls the whole context back in to fix it, over and over. Every one of those re-reads costs a quarter on 5.1 of what it cost on 5. Same games on screen, and the newer version just spends less to get there. Across three builds the loop paid for the upgrade on its own.
We’re introducing Claude Fable 5.1 and Claude Mythos 5.1.
They're the world’s most advanced models for coding and knowledge work.