Claude Fable 5 vs Claude Opus 5.5
Side-by-side comparison using current list prices and the live leaderboard.
Verdict
Claude Opus 5.5 is 2.5x cheaper per input token.
- Claude Fable 5 is #1 on the LMRank leaderboard; Claude Opus 5.5 is not ranked yet.
- Claude Opus 5.5 is 2.5x cheaper per input token ($4.00 vs $10.00 per 1M).
- Both have a 1M-token context window.
At a Glance
| Attribute | Claude Fable 5 | Claude Opus 5.5 |
|---|---|---|
| Lab | Anthropic | Anthropic |
| Leaderboard rank | #1 | Not ranked yet |
| Tags | Long Context Coding Intelligent Reasoning Agentic | Long Context Coding Intelligent Reasoning Agentic |
| Context | 1M tokens | 1M tokens |
| Input price | $10.00/1M | $4.00/1M |
| Output price | $50.00/1M | $20.00/1M |
| Input modalities | Image and text | Text, image, and file |
| Output modalities | Text | Text |
Claude Fable 5: strengths
- #1 Intelligence Index at 64.9
- 1M-token context window
- 95% on SWE-bench Verified
- Strong agentic and coding performance
- Vision and scientific research capable
Claude Opus 5.5: strengths
- Flagship reasoning and coding capability
- 1M-token context window
- Strong long-horizon agent positioning
Claude Fable 5: weaknesses
- Safety fallback reduces capability on sensitive queries
- Access may still be capacity-constrained after the June 2026 suspension
- High cost: $10/$50 per million tokens
- Mandatory 30-day data retention
Claude Opus 5.5: weaknesses
- High output-token price
- Limited independent evaluation data
Claude Fable 5: best for
- Autonomous agentic workflows
- Long-horizon software engineering
- Complex knowledge work and research
- Multi-step tool-use with verifiable chain-of-thought
Claude Opus 5.5: best for
- Large codebase changes
- Complex research
- Long-running agents