0 vs 3 benchmarks won
Anthropic Claude Sonnet 4.5 | Meta Muse Spark | |
|---|---|---|
| Overview | ||
| Company | Anthropic | Meta |
| Release date | Sep 29 2025 | Apr 8 2026 |
| Model type | — | — |
| Open source | No | No |
| Specifications | ||
Parameters | — | — |
Context window | — | — |
| Benchmarks | ||
Science reasoning GPQA Diamond | 83.4% | 89.5% |
Software engineering SWE-Bench Verified | 77.2% | 77.4% |
Multimodal understanding MMMU | 68% | 80.4% |
| Timeline | ||
| Release gap | Claude Sonnet 4.5 shipped 191 days before Muse Spark | |
Muse Spark leads Claude Sonnet 4.5 on 3 of the tracked benchmarks (GPQA Diamond, SWE-Bench Verified, MMMU). Claude Sonnet 4.5 shipped 191 days before Muse Spark, so benchmark comparisons should account for the intervening progress.
Published specifications for these two models are limited — see each model page for the latest details.
On GPQA Diamond, Muse Spark scores 89.5%, 6.1 points above Claude Sonnet 4.5 at 83.4%. On SWE-Bench Verified, Muse Spark scores 77.4%, 0.2 points above Claude Sonnet 4.5 at 77.2%. On MMMU, Muse Spark scores 80.4%, 12.4 points above Claude Sonnet 4.5 at 68%.