Model decision surface
Compare AI models
Start with Claude Opus 5.5 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 Opus 5.5 vs Muse Spark Open
Live dataset updated 10/15/2026, 9:04:45 PM UTC
Open 1200×630 evidence receipt| Field | Claude Opus 5.5 Anthropic | Muse Spark Open Meta |
|---|---|---|
| ModelCap position | #2 | #15 |
| Index score | 86.7 | 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 | $4.00 | $1.25 |
| Output / 1M | $20.00 | $4.25 |
| Pricing status | fresh | fresh |
| Context | 1M | 1M |
| Providers | 5 | 4 |
| Weight access | No linked weights | Gated access |
Decision facts
- Claude Opus 5.5 is #2; Muse Spark Open is #15 on the same current language board.
- Index scores are 86.7 for Claude Opus 5.5 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 Opus 5.5 is Measured; Muse Spark Open is Estimated.
- Listed output price per 1M tokens is $20.00 for Claude Opus 5.5 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 $18.00 for Claude Opus 5.5 versus $4.63 for Muse Spark Open. Muse Spark Open costs 74.3% 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 Opus 5.5 and 1,048,576 for Muse Spark Open.
- Weight access differs: Claude Opus 5.5 is none; Muse Spark Open is gated.
- ModelCap currently lists 5 providers for Claude Opus 5.5 and 4 for Muse Spark Open.
These are separate published fields, not a synthetic winner. ModelCap does not collapse price, access, context, and capability evidence into a hidden recommendation score.
Popular comparisons
- Claude Opus 5.5 vs Gemini 4 Argon#2 vs #1 on the ModelCap Index
- Gemini 4 Argon vs Muse Wonder#1 vs #3 on the ModelCap Index
- Claude Opus 5.5 vs Muse Wonder#2 vs #3 on the ModelCap Index
- Claude Fable 5.1 vs Gemini 4 Argon#4 vs #1 on the ModelCap Index
- Claude Fable 5.1 vs Claude Opus 5.5#4 vs #2 on the ModelCap Index
- Claude Fable 5.1 vs Muse Wonder#4 vs #3 on the ModelCap Index
- Gemini 4 Argon vs Muse Spark 1.3#1 vs #5 on the ModelCap Index
- Claude Opus 5.5 vs Muse Spark 1.3#2 vs #5 on the ModelCap Index
- Muse Spark 1.3 vs Muse Wonder#5 vs #3 on the ModelCap Index
- Claude Fable 5.1 vs Muse Spark 1.3#4 vs #5 on the ModelCap Index
- Gemini 3.8 Flash vs Gemini 4 Argon#6 vs #1 on the ModelCap Index
- Claude Opus 5.5 vs Gemini 3.8 Flash#2 vs #6 on the ModelCap Index
- Gemini 3.8 Flash vs Muse Wonder#6 vs #3 on the ModelCap Index
- Claude Fable 5.1 vs Gemini 3.8 Flash#4 vs #6 on the ModelCap Index
- Gemini 3.8 Flash vs Muse Spark 1.3#6 vs #5 on the ModelCap Index
- Gemini 4 Argon vs GPT-6.1 Sol#1 vs #8 on the ModelCap Index
- Claude Opus 5.5 vs GPT-6.1 Sol#2 vs #8 on the ModelCap Index
- Muse Wonder vs GPT-6.1 Sol#3 vs #8 on the ModelCap Index
- Claude Fable 5.1 vs GPT-6.1 Sol#4 vs #8 on the ModelCap Index
- Muse Spark 1.3 vs GPT-6.1 Sol#5 vs #8 on the ModelCap Index
- Gemini 3.8 Flash vs GPT-6.1 Sol#6 vs #8 on the ModelCap Index
- Gemini 3.1 Pro Preview vs Gemini 4 Argon#9 vs #1 on the ModelCap Index
- Claude Opus 5.5 vs Gemini 3.1 Pro Preview#2 vs #9 on the ModelCap Index
- Gemini 3.1 Pro Preview vs Muse Wonder#9 vs #3 on the ModelCap Index
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.