Claude Fable 5 vs Claude Fable 5.1: Specs & Benchmark Comparison
Claude Fable 5 and Claude Fable 5.1 both come from Anthropic, Claude Fable 5 was released in June 2026, and Claude Fable 5.1 followed 3 months later in September 2026.
The two models share 3 published benchmarks. Claude Fable 5.1 leads on 3 of them. The widest gaps are on AutomationBench, where Claude Fable 5.1 scores 31.4% against 17.4%; Terminal-Bench 4.0, where Claude Fable 5.1 scores 55.8% against 44.5%. Averaged across everything we track, Claude Fable 5 sits at 59.8% and Claude Fable 5.1 at 59.7%.
On price the two are close: Claude Fable 5 costs $10 per million input tokens and $50 per million output tokens, Claude Fable 5.1 $10 and $50. Both accept a context window of about 1M tokens. Both accept text and images as input.
| 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 | 59.8% | 59.7% |
| Benchmarks | ||
| AutomationBench | 17.4% | 31.4% |
| Terminal-Bench 4.0 | 44.5% | 55.8% |
| Humanity's Last Exam | 64.5% | 65.0% |
Visual Benchmark Comparison
Verdict
Claude Fable 5.1 leads in 1 out of 4 comparison categories.
Both models show comparable average scores: Claude Fable 5 — 0.6, Claude Fable 5.1 — 0.6.
API cost is identical: input $10.00/1M, output $50.00/1M tokens.
Same context size: 1M tokens.
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?
Which model is cheaper — Claude Fable 5 or Claude Fable 5.1?
Which has a larger context window — Claude Fable 5 or Claude Fable 5.1?
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.