# Cognition — Making Fable Cheaper Than Opus

- Company: Cognition (cognition.com)
- Announced: 2026-07-13
- Category: model-update
- Coverage: not counted
- Announcement: yes
- Group: models
- Source: https://cognition.com/blog/making-fable-cheaper-than-opus
- Record: https://forck.live/items/7646-making-fable-cheaper-than-opus
- Subject: Devin / SWE
- Models affected: Fable 5, Opus 4.8
- Pricing: Fable 5 costs twice as much per token as Opus 4.8

Cognition replaced Opus 4.8 with Fable 5 in Devin, and despite Fable costing twice as much per token, the overall bill decreased when using the Fusion architecture with a sidekick. In 3,000 evaluation sessions on FrontierCode 1.1, Fable + Sidekick cost $1.86 per run versus $2.04 for Opus + Sidekick, while scoring higher (60.7 vs 54.6). The cost savings come from Fable's management style: it delegates more effectively, taking fewer turns and consuming less context.

## Evidence

Verbatim from https://cognition.com/blog/making-fable-cheaper-than-opus:

> We replaced Opus 4.8 with Fable 5, and Devin’s bill went down. Fable 5 costs twice as much per token as Opus 4.8. But when we ran both models on FrontierCode 1.1 using our new Fusion architecture, Fable cost less.

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