Claude Fable 5 vs Claude Opus 5
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Claude Fable 5 vs Claude Opus 5 in real side-by-side tests: 2 posts from X where both got the same prompt; 1 post reports cost or time. Judge coding ability from the actual outputs.
Posts
2
Same prompt, separate runs
2Not a controlled comparison: prompts, tools and time differ.
Summary
Claude Fable 5 and Claude Opus 5 appear together in 2 posts on X: No Man's Sky from scratch, 4 models (@remakebench) and ultra-realistic flight simulator (@Pixel_Neuron). 1 of them are part of larger lineups with other models. In @remakebench's No Man's Sky from scratch, 4 models, Claude Opus 5 was cheaper ($133.83 vs $280.14) and Claude Fable 5 was faster (2 h 05 min vs 2 h 32 min), as reported in the post.
What each post reports
| Post | Model | Time | Cost | Tokens | Original |
|---|---|---|---|---|---|
| No Man's Sky from scratch, 4 models@remakebench | Claude Opus 5 | 2 h 32 min | $133.83 | — | X post |
| No Man's Sky from scratch, 4 models@remakebench | Claude Fable 5 | 2 h 05 min | $280.14 | — | X post |
| Ultra-realistic flight simulator@Pixel_Neuron | Claude Opus 5 | — | — | — | X post |
| Ultra-realistic flight simulator@Pixel_Neuron | Claude Fable 5 | — | — | — | X post |
Only numbers stated in each post. “—” means the post doesn’t say.