Claude Fable 5 vs Claude Fable 5.1
Side-by-side comparison using current list prices and the live leaderboard.
Verdict
Claude Fable 5 and Claude Fable 5.1 are closely matched on price and context.
- Claude Fable 5 is #1 on the LMRank leaderboard; Claude Fable 5.1 is not ranked yet.
- Both cost $10.00 per 1M input tokens.
- Both have a 1M-token context window.
At a Glance
| Attribute | Claude Fable 5 | Claude Fable 5.1 |
|---|---|---|
| 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 | $10.00/1M |
| Output price | $50.00/1M | $50.00/1M |
| 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 Fable 5.1: strengths
- Frontier-tier coding and agentic performance
- Million-token context window
- Reliable multi-step tool use
- Strong long-form knowledge work
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 Fable 5.1: weaknesses
- High input and output pricing
- New version has limited independent benchmark history
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 Fable 5.1: best for
- Autonomous software engineering
- Long-running research agents
- Complex tool-using workflows