Muse Spark 1.3 vs Claude Opus 5.5
Muse Spark 1.3 is from Meta, released September 2, 2026. Claude Opus 5.5 is from Anthropic, released September 22, 2026.
- LMArena Elo1495 vs 1504. Claude Opus 5.5 is 0.6% ahead on LMArena Elo.
- Input per 1M$1.25 vs $4. Muse Spark 1.3 costs 69% less per million input tokens.
- Output per 1M$4.25 vs $20. Muse Spark 1.3 costs 79% less per million output tokens.
- Context window1M vs 1M. Both hold 1M tokens of context.
Prices are the vendors’ published API rates; Elo is LMArena’s text board. Each figure is dated on its model page.
Interactive Comparison
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$1.25 / $4.25 per 1M tokens (standard endpoint) | $4 / $20 per 1M tokens | |
|---|---|---|
| Identity | ||
| Developer | Meta | Anthropic |
| Released | Sep 2026 | Sep 2026 |
| Status | GA | GA |
| Licence | Proprietary | Proprietary |
| Self-hostable | No | No |
| Cost | ||
| Blended $/1M tokensinput × 0.75 + output × 0.25 | $2.000 / 1M tokens | $8.000 / 1M tokens |
| Input price | $1.250 / 1M tokens | $4.000 / 1M tokens |
| Output price | $4.250 / 1M tokens | $20.000 / 1M tokens |
| Cached input | — | $0.20 per 1M tokens |
| Batch discount | — | 50% ($2 / $10 per 1M tokens) |
| Capacity | ||
| Context window | 1M tokens | 1M tokens |
| Max output | — | 128k tokens |
| Capability | ||
| Vision in | Yes | Yes |
| Audio in | — | No |
| Function calling | — | Yes |
| Structured output | — | Yes |
| Extended reasoning | — | Yes |
| Web search | — | Yes |
| Code execution | — | Yes |
| Access | ||
| API | Yes | Yes |
| Chat app | Yes | Yes |
| Cloud marketplaces | — | Amazon Bedrock, Google Cloud, Microsoft Foundry |
| Fine-tuning | — | No |
| Measured quality | ||
| LMArena Elo | 1495 (checked Oct 2026) | 1504 (checked Oct 2026) |
| LMArena rank | Rank 8 | Rank 4 |
| Elo per dollarLMArena Elo ÷ blended $/1M tokens | 748 | 188 |
