Model decision surface
Compare AI models
Start with Claude Fable 5.1 and Muse Spark Open, 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 Muse Spark Open
Live dataset updated 10/15/2026, 9:04:45 PM UTC
Open 1200×630 evidence receipt| Field | Claude Fable 5.1 Anthropic | Muse Spark Open Meta |
|---|---|---|
| ModelCap position | #4 | #15 |
| Index score | 85.6 | 79.6 |
| Evidence | Measured4 public benchmark observations across 4 boards | Estimatedpublisher-corpus-prior over 213 held-out anchors (22%); launch card against 5 resolved peers on 11 rows (78%); exceeds every named peer on 3 of 11 rows; optimism haircut 0 from cross-lab-probe; shrunk 1 up toward the measured corpus |
| Input / 1M | $10.00 | $1.25 |
| Output / 1M | $50.00 | $4.25 |
| Pricing status | fresh | fresh |
| Context | 1M | 1M |
| Providers | 4 | 4 |
| Weight access | No linked weights | Gated access |
Decision facts
- Claude Fable 5.1 is #4; Muse Spark Open is #15 on the same current language board.
- Index scores are 85.6 for Claude Fable 5.1 and 79.6 for Muse Spark Open. 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; Muse Spark Open is Estimated.
- Listed output price per 1M tokens is $50.00 for Claude Fable 5.1 and $4.25 for Muse Spark Open. 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 $4.63 for Muse Spark Open. Muse Spark Open costs 89.7% 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 1,048,576 for Muse Spark Open.
- Weight access differs: Claude Fable 5.1 is none; Muse Spark Open is gated.
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.