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Sakana claims its AI model router Fugu Ultra v1.1 now beats Fable 5 without even including it in the pool
Sakana AI has unveiled Fugu Ultra v1.1, enhancing its AI model router with a performance boost claimed to reach up to 7.9 points improvement over the previous version. Notably, the router is asserted to surpass Fable 5's performance, despite Fable 5 not being in the selection pool, raising questions about the reliability of the claims as no independent validation has been reported. The Fugu Ultra v1.1 continues to maintain its competitive pricing while offering a new Claude Code-compatible endpoint for effortless integration.
MonitorConfidence: MediumShort term horizon
Published 24 Jul 2026, 16:10 UTC1 min read
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Summary
TL;DR
- Sakana AI released Fugu Ultra v1.1 with claimed performance gains.
- Reported improvements of up to 7.9 points over Fugu v1.0.
- Fugu Ultra v1.1 claims to outperform Fable 5, which is not included.
- Pricing remains at $5 per million input tokens.
- The update introduces a Claude Code-compatible endpoint.
Interesting facts
- Claims of performance gains are not yet independently verified.
- Two weeks are required to add new models to the selection process.
Coverage gaps