Claude Fable 5.1 vs Claude Sonnet 5: Specs & Benchmark Comparison
| Characteristic | Claude Fable 5.1 | Claude Sonnet 5 |
|---|---|---|
| Company | Anthropic | Anthropic |
| Release Date | September 1, 2026 | June 30, 2026 |
| Parameters | — | — |
| Multimodal | Yes | Yes |
| Context (input) | 1.0M | 1.0M |
| Context (output) | 128K | 64K |
| Input Price / 1M | $10.00 | $2.00 |
| Output Price / 1M | $50.00 | $10.00 |
| Average Score | 0.6 | 0.6 |
| Benchmarks | ||
| AutomationBench | 0.3 | 0.1 |
| Humanity's Last Exam | 0.7 | 0.6 |
Visual Benchmark Comparison
Claude Fable 5.1
Claude Sonnet 5
AutomationBench0.3 vs 0.1
0.3
0.1
Humanity's Last Exam0.7 vs 0.6
0.7
0.6
Verdict
Claude Fable 5.1 leads in 2 out of 4 comparison categories.
Overall Performance
Both models show comparable average scores: Claude Fable 5.1 — 0.6, Claude Sonnet 5 — 0.6.
API Cost
Claude Sonnet 5 is 5.0x cheaper: input $2.00/1M vs $10.00/1M 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 6/30/2026.
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Frequently Asked Questions
Which is better for coding — Claude Fable 5.1 or Claude Sonnet 5?
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 5.1 or Claude Sonnet 5?
Claude Sonnet 5 is cheaper for input: $2.00 per 1M tokens vs $10.00.
Which has a larger context window — Claude Fable 5.1 or Claude Sonnet 5?
Claude Fable 5.1 supports a larger context: 1,048,576 tokens vs 1,000,000.
The Claude Fable 5.1 and Claude Sonnet 5 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 5.1 or Claude Sonnet 5 page. See also the complete list of AI model comparisons.