Claude Fable 5 vs Claude Fable 5.1: Specs & Benchmark Comparison
| Characteristic | Claude Fable 5 | Claude Fable 5.1 |
|---|---|---|
| Company | Anthropic | Anthropic |
| Release Date | June 9, 2026 | September 1, 2026 |
| Parameters | — | — |
| Multimodal | Yes | Yes |
| Context (input) | 1.0M | 1.0M |
| Context (output) | 128K | 128K |
| Input Price / 1M | $10.00 | $10.00 |
| Output Price / 1M | $50.00 | $50.00 |
| Average Score | 0.6 | 0.6 |
| Benchmarks | ||
| AutomationBench | 0.2 | 0.3 |
| Humanity's Last Exam | 0.6 | 0.7 |
Visual Benchmark Comparison
Claude Fable 5
Claude Fable 5.1
AutomationBench0.2 vs 0.3
0.2
0.3
Humanity's Last Exam0.6 vs 0.7
0.6
0.7
Verdict
Claude Fable 5.1 leads in 2 out of 4 comparison categories.
Overall Performance
Both models show comparable average scores: Claude Fable 5 — 0.6, Claude Fable 5.1 — 0.6.
API Cost
API cost is identical: input $10.00/1M, output $50.00/1M tokens.
Context Window
Claude Fable 5.1 supports a larger context: 1M vs 1M tokens.
Recency
Claude Fable 5.1 is newer: released 9/1/2026 vs 6/9/2026.
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Frequently Asked Questions
Which is better for coding — Claude Fable 5 or Claude Fable 5.1?
Direct comparison on the SWE-Bench benchmark is not available. We recommend reviewing other metrics on the comparison page.
Which model is cheaper — Claude Fable 5 or Claude Fable 5.1?
Claude Fable 5 is cheaper for input: $10.00 per 1M tokens vs $10.00.
Which has a larger context window — Claude Fable 5 or Claude Fable 5.1?
Claude Fable 5.1 supports a larger context: 1,048,576 tokens vs 1,000,000.
The Claude Fable 5 and Claude Fable 5.1 comparison is updated for 2026. Data includes benchmark results, API pricing, context window size and other specifications. For more detailed information, visit the Claude Fable 5 or Claude Fable 5.1 page. See also the complete list of AI model comparisons.