Story · @cognition
Devin adds Fable 5.1; Cognition says caching change makes it 54% cheaper (@cognition)
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Cognition put Fable 5.1 in Devin and says Fable-level intelligence is now 54% cheaper, because cached-token prices fell 4x and over 95% of the tokens in a coding task are cached. Its Fusion harness reportedly matches Fable 5.1 on FrontierCode at 47% lower cost.
In plain words
- Cognition added Fable 5.1 to Devin and says the same level of capability now costs 54% less.
- Over 95% of tokens, small pieces of text the system processes, are reused during a coding task.
- Fable 5.1 made those reused pieces four times cheaper, producing Cognition's reported savings.
- Devin's Fusion setup reportedly uses one advanced system for planning and a cheaper system for carrying out the plan.
- Cognition says Fusion matches Fable 5.1 on a coding test at 47% lower cost, potentially reducing developers' bills.
Appeared in
- Anthropic's deliberately misaligned model, Fable 5.1, and a fix for reward hacking
Sep 02, 2026 · from X
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