League fixture
Claude Haiku 5.5 vs Claude Fable 5.1.
Value champion vs League leader — decided by the data: category winners, tale of the tape and head-to-head benchmarks.
League fixture: Value champion vs League leader. In Season Zero, fixture results are decided by the data — the category winners above. When voted fixtures launch, results blend 60% benchmark / 40% crowd per the published rulebook.
Verdict by category
| Category | Claude Fable 5.1 | Claude Haiku 5.5 | Winner |
|---|---|---|---|
| League Score | 97.3 | 67.9 | Claude Fable 5.1 |
| Coding (SWE-bench %) | — | — | — |
| Reasoning (GPQA %) | 93.7 | — | — |
| Context (tokens) | 1000000 | 1000000 | Draw |
| Speed (tok/s) | — | — | — |
| Price (blended $/1M) | $20.00 | $0.20 | Claude Haiku 5.5 (cheaper) |
Tale of the tape
| Spec | Claude Fable 5.1 | Claude Haiku 5.5 |
|---|---|---|
| Maker | Anthropic | Anthropic |
| Released | Sep 1, 2026 | Oct 7, 2026 |
| League Score | 97 | 68 |
| Context | 1,000,000 tokens | 1,000,000 tokens |
| Max output | 128,000 | 128,000 |
| $/1M input | $10.00 | $0.10 |
| $/1M output | $50.00 | $0.50 |
| Weights | Closed | Closed |
| Speed | — | — |
Head-to-head benchmarks (shared only)
| Benchmark | Claude Fable 5.1 | Claude Haiku 5.5 |
|---|---|---|
| LiveBench overall | 88.0 | 74.5 |
Cost at three workloads
| Workload | Claude Fable 5.1 | Claude Haiku 5.5 |
|---|---|---|
| Light — 1M in / 250K out | $22.50 | $0.23 |
| Standard — 10M in / 2.5M out | $225.00 | $2.25 |
| Long-context — 50M in / 5M out | $750.00 | $7.50 |
The pick
Pick Claude Fable 5.1 if you want the higher overall League Score.
Pick Claude Haiku 5.5 if you want the lower running cost.
All figures from the model database — sources and dates on each model page. Cost your own workload or compare a different pair.