Claude Sonnet 5.5 vs Muse Spark 1.3
API pricing, benchmark indices and specs — updated 19 October 2026.
anthropic · A · API-only
Input / 1M
$2.00
Output / 1M
$10.00
AA index
56
proprietary · 1M context
meta · B · API-only
Input / 1M
$1.25
Output / 1M
$4.25
AA index
48.1
proprietary · 1M context
Specification comparison
Differences are highlighted; identical values are muted.
| Specification | Claude Sonnet 5.5 | Muse Spark 1.3 |
|---|---|---|
| Deployment | API-only (closed weights) | API-only (closed weights) |
| Parameters | n/a — API-only | n/a — API-only |
| Architecture | n/a — API-only | n/a — API-only |
| Context length | 1,000,000 | 1,048,576 |
| Licence | Proprietary | Proprietary |
| Commercial use | Per API terms | Per API terms |
| Languages | n/a — API-only | n/a — API-only |
| Downloads 30d | n/a — API-only | n/a — API-only |
| Downloads all time | n/a — API-only | n/a — API-only |
| Quantizations on the Hub | n/a — API-only | n/a — API-only |
| Gated | n/a — API-only | n/a — API-only |
| First seen on the Hub | n/a — API-only | n/a — API-only |
| API input price / 1M tokens | $2.00 | $1.25 |
| API output price / 1M tokens | $10.00 | $4.25 |
| Est. cost per 1M input + 1M output tokens | $12.00 | $5.50 |
| Cached input / 1M tokens | $0.10 | $0.15 |
| AA Intelligence Index | 56 | 48.1 |
| AA Coding Index | — | 75.8 |
| AA Agentic Index | — | 55.5 |
| Max output tokens | 128,000 | 943,718 |
| API providers | 5 | 1 |
| Tool calling | Yes | Yes |
| Reasoning mode | Yes | Yes |
API cost
Estimated cost of 1M input + 1M output tokens via OpenRouter
Claude Sonnet 5.5
$12.00
Muse Spark 1.3
$5.50
Muse Spark 1.3 is 2.2× cheaper at list price.