Cognition announced Claude Fable 5.1 in Devin. With Anthropic’s cache pricing change, Fable-level intelligence is about 54% cheaper—even undercutting Opus. Devin’s Fusion harness matches Fable 5.1 on FrontierCode at roughly 47% lower cost, folding the new model into production agent workflows.

Key Takeaways

  • ✓Devin now runs Claude Fable 5.1 for coding agents.
  • ✓Cache pricing makes Fable-class capability ~54% cheaper, undercutting Opus on cost.
  • ✓Fusion matches Fable 5.1 on FrontierCode at ~47% lower cost for scaled agent runs.
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Key Decision Metrics at a Glance

TL;DR Verdict
🏆 Benchmark RankRank
Fusion matches Fable 5.1 on FrontierCode at ~47% lower cost for scaled agent runs.
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Cache pricing makes Fable-class capability ~54% cheaper, undercutting Opus on cost.
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🛠️ Ecosystem & IDERules
Devin 2.0 (Cognition)
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Up NextCognition launches FrontierCode 2.0 coding benchmark: it asks whether a PR should be merged, and top model Claude Opus 5.5 scores just 45.5%
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