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…
What you can do with it
AI at Work →Adjust task quality and cost with 'thinking budget' settings in Claude
What you get You can draft content with tighter control and cut Opus usage by 30%.
Lets users dial up or down Claude’s reasoning depth.
- Who for
- marketers
- Cost
- included in a tool you already have
- Effort
- minutes
- Already included in
- Claude’s subscription plans
Use it for
- Draft content with tighter control
- Cut Opus usage by 30%
- Test prompts side-by-side
How to set it up · From the article
- Set Claude’s effort level to *high* or *medium* for Sonnet/Opus
- Run the same prompt on both models
- Compare token usage and output quality
Watch out Check the details on the maker's page first
Key points from the news
- 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 →
The story so far
8 episodes →- Claude Opus 5.5 costs 60% less than Fable 5.1 for writing tasksthis story
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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This text was published by note.com and written by ソルー＠セット本せどり. It is reproduced here with attribution so you can read it in full; the rights remain with the publisher. Read it at the source ↗
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