Claude Opus 5.5 costs 60% less than Fable 5.1 for writing tasks
A user compared Claude Opus 5.5 and Fable 5.1 on writing tasks, finding Opus 5.5 faster and cheaper but more cautious with facts. Opus 5.5 priced at $4 input / $20 output per 1M tokens (vs. Fable’s $10 / $50), costing $0.41 per article (vs. Fable’s $1.05) while producing longer drafts in less time. However, Fable’s prose matched the user’s style better but included unverified claims, while Opus…
Key points
- Opus 5.5 costs **60% less** than Fable 5.1 for writing tasks but produces **longer drafts in less time**
- Fable’s prose matched the user’s style better but included **unverified factual claims**, while Opus 5.5 was more cautious
- Replacing Fable with Opus 5.5 for **blog structuring** kept costs nearly the same, but full drafts cost **3.2x more**
For blog generation, replacing Fable with Opus 5.5 for structuring alone kept costs nearly identical, but using it for full drafts tripled costs due to higher token usage. The user retained Fable for writing and design tasks, reserving its quota, and assigned Opus 5.5 to lighter tasks like log analysis. They plan further tests before fully switching.
Model pages: Claude Opus 5.5 → · Claude Fable 5.1 →
I had Opus 5.5 and Fable 5.1 write the same article to compare them: The cheaper one is more cautious with facts, the more expensive one writes better
note.com · 23 September 2026
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