2 vs 1 benchmarks won
Meta Muse Spark | OpenAI GPT-5.5 | |
|---|---|---|
| Overview | ||
| Company | Meta | OpenAI |
| Release date | Apr 8 2026 | Apr 23 2026 |
| Model type | — | — |
| Open source | No | No |
| Specifications | ||
Parameters | — | — |
Context window | — | — |
| Benchmarks | ||
Science reasoning GPQA Diamond | 89.5% | 93.6% |
Software engineering SWE-Bench Verified | 77.4% | — |
Multimodal understanding MMMU | 80.4% | — |
| Timeline | ||
| Release gap | Muse Spark shipped 15 days before GPT-5.5 | |
Muse Spark leads GPT-5.5 on 2 of the tracked benchmarks (GPQA Diamond, SWE-Bench Verified, MMMU). Muse Spark shipped 15 days before GPT-5.5, 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, GPT-5.5 scores 93.6%, 4.1 points above Muse Spark at 89.5%.