# Fable 5.1 in Devin and Why It’s Cheaper than Opus 5 | Devin

The integration lowers Devin task costs by 10% to 25% following a prompt-caching rate cut to $0.25 per million tokens.

- Fable 5.1 is now available in Devin Desktop, Devin CLI, and Devin Cloud.
- Prompt-caching reads drop 75% to $0.25 per million tokens, cutting Fable end-to-end task costs by 54%.
- Fable 5.1 uses 33% fewer tokens than Opus 5 on FrontierCode benchmark tasks by making fewer tool calls.
- Eligible customers can use Claude Fable 5 and 5.1 under zero data retention agreements under a time-bound exemption.

## Why it matters

Devin users gain access to Fable 5.1 with lower end-to-end execution costs and enterprise zero data retention options.

## Sources

- [Devin: Fable 5.1 in Devin and Why It’s Cheaper than Opus 5 | Devin](https://devin.ai/blog/fable-5-1)

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Summarized by dstilled on 2026-09-01. https://dstilled.ai/story/487fcb0d-d61d-4902-ad73-afb72896359c