Claude Fable 5.1 vs Claude Haiku 5.5: Specs & Benchmark Comparison
Claude Fable 5.1 and Claude Haiku 5.5 both come from Anthropic, Claude Fable 5.1 was released in September 2026, and Claude Haiku 5.5 followed a month later in October 2026.
The two models share 2 published benchmarks. Claude Fable 5.1 leads on 2 of them. The widest gaps are on Terminal-Bench-Science 0.1, where Claude Fable 5.1 scores 52.6% against 20.6%; Terminal-Bench 4.0, where Claude Fable 5.1 scores 55.8% against 39.2%. Averaged across everything we track, Claude Fable 5.1 sits at 59.7% and Claude Haiku 5.5 at 57.7%.
Claude Haiku 5.5 is the cheaper API at $0.10 per million input tokens and $0.50 per million output tokens, roughly 100 times cheaper than Claude Fable 5.1 at $10 and $50. Both accept a context window of about 1M tokens. Both accept text and images as input.
| Characteristic | Claude Fable 5.1 | Claude Haiku 5.5 |
|---|---|---|
| Company | Anthropic | Anthropic |
| Release Date | September 1, 2026 | October 7, 2026 |
| Parameters | — | — |
| Multimodal | Yes | Yes |
| Context (input) | 1.0M | 1.0M |
| Context (output) | 128K | 128K |
| Input Price / 1M | $10.00 | $0.10 |
| Output Price / 1M | $50.00 | $0.50 |
| Average Score | 59.7% | 57.7% |
| Benchmarks | ||
| Terminal-Bench-Science 0.1 | 52.6% | 20.6% |
| Terminal-Bench 4.0 | 55.8% | 39.2% |
Visual Benchmark Comparison
Verdict
Claude Haiku 5.5 leads in 2 out of 4 comparison categories.
Both models show comparable average scores: Claude Fable 5.1 — 0.6, Claude Haiku 5.5 — 0.6.
Claude Haiku 5.5 is 100.0x cheaper: input $0.10/1M vs $10.00/1M tokens.
Same context size: 1M tokens.
Claude Haiku 5.5 is newer: released 10/7/2026 vs 9/1/2026.
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Frequently Asked Questions
Which is better for coding — Claude Fable 5.1 or Claude Haiku 5.5?
Which model is cheaper — Claude Fable 5.1 or Claude Haiku 5.5?
Which has a larger context window — Claude Fable 5.1 or Claude Haiku 5.5?
The Claude Fable 5.1 and Claude Haiku 5.5 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 Haiku 5.5 page. See also the complete list of AI model comparisons.