Model decision surface
Compare AI models
Start with Claude Fable 5.1 and Seed 2.1 Turbo, 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 Seed 2.1 Turbo
Live dataset updated 9/10/2026, 6:20:44 AM UTC
Open 1200×630 evidence receipt| Field | Claude Fable 5.1 Anthropic | Seed 2.1 Turbo ByteDance Seed |
|---|---|---|
| ModelCap position | #3 | #18 |
| Index score | 87.9 | 76.8 |
| Evidence | Measured5 public benchmark observations across 5 boards | Estimatedglobal-corpus-prior over 185 held-out anchors (12%); launch card against 2 resolved peers on 3 rows (88%); exceeds every named peer on 1 of 3 rows; no cross-lab optimism probe available; shrunk 3.1 toward the measured corpus |
| Input / 1M | $10.00 | $0.50 |
| Output / 1M | $50.00 | $2.50 |
| Pricing status | fresh | fresh |
| Context | 1M | 262K |
| Providers | 4 | 1 |
| Weight access | API only | API only |
Decision facts
- Claude Fable 5.1 is #3; Seed 2.1 Turbo is #18 on the same current language board.
- Index scores are 87.9 for Claude Fable 5.1 and 76.8 for Seed 2.1 Turbo. Their published uncertainty intervals overlap, so the rank difference alone does not establish a reliable capability advantage for your workload.
- Evidence differs: Claude Fable 5.1 is Measured; Seed 2.1 Turbo is Estimated.
- Listed output price per 1M tokens is $50.00 for Claude Fable 5.1 and $2.50 for Seed 2.1 Turbo. 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 $2.25 for Seed 2.1 Turbo. Seed 2.1 Turbo costs 95.0% 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 262,144 for Seed 2.1 Turbo.
- ModelCap currently lists 4 providers for Claude Fable 5.1 and 1 for Seed 2.1 Turbo.
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.