Model decision surface
Compare AI models
Start with Claude Fable 5.1 and Claude Haiku 5.5, or choose any two current ranked language models. Compare capability evidence, price, context, provider availability, and weight access without pretending one field decides every use case.
Current public data
Claude Fable 5.1 vs Claude Haiku 5.5
Live dataset updated 10/14/2026, 6:29:17 AM UTC
Open 1200×630 evidence receipt| Field | Claude Fable 5.1 Anthropic | Claude Haiku 5.5 Anthropic |
|---|---|---|
| ModelCap position | #4 | #59 |
| Index score | 85.6 | 63.5 |
| Evidence | Measured4 public benchmark observations across 4 boards | Measured1 reported rows against measured corpus ladders (24%); publisher-corpus-prior over 213 held-out anchors (14%); measured predecessor anthropic/claude-haiku-4.5 less the succession penalty (51%); 1 specialist-board observation at 2.5% support (11%); shrunk 2.3 up toward the measured corpus |
| Input / 1M | $10.00 | $0.10 |
| Output / 1M | $50.00 | $0.50 |
| Pricing status | fresh | fresh |
| Context | 1M | 1M |
| Providers | 4 | 5 |
| Weight access | No linked weights | No linked weights |
Decision facts
- Claude Fable 5.1 is #4; Claude Haiku 5.5 is #59 on the same current language board.
- Index scores are 85.6 for Claude Fable 5.1 and 63.5 for Claude Haiku 5.5. Their published uncertainty intervals do not overlap, but the aggregate Index does not predict performance on every task; compare the relevant benchmark configurations before choosing.
- Both positions use Measured evidence.
- Listed output price per 1M tokens is $50.00 for Claude Fable 5.1 and $0.50 for Claude Haiku 5.5. For 1,000 requests with 2,000 input and 500 output tokens each (2M input + 0.5M output), the listed-rate estimate is $45.00 for Claude Fable 5.1 versus $0.45 for Claude Haiku 5.5. Claude Haiku 5.5 costs 99.0% less in this scenario. This excludes caching, batch discounts, prompt-length tiers, tool charges and retries; verify the selected endpoint before budgeting.
- Published context is 1,000,000 tokens for Claude Fable 5.1 and 1,000,000 for Claude Haiku 5.5.
- ModelCap currently lists 4 providers for Claude Fable 5.1 and 5 for Claude Haiku 5.5.
These are separate published fields, not a synthetic winner. ModelCap does not collapse price, access, context, and capability evidence into a hidden recommendation score.
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Each comparison page is a permanent, shareable URL with the same live figures as this tool: ModelCap Index position, API pricing, context window, provider count, weight access and every shared benchmark board.