Meta Muse Spark vs OpenAI gpt-oss-20b — side-by-side specs.
Meta Muse Spark | OpenAI gpt-oss-20b | |
|---|---|---|
| Overview | ||
| Company | Meta | OpenAI |
| Release date | Apr 8 2026 | Aug 5 2025 |
| Model type | — | — |
| Open source | No | Yes |
| Specifications | ||
Parameters | — | — |
Context window | — | — |
| Benchmarks | ||
Coding SWE-Bench VerifiedReal coding tasks pulled from open-source projects — the AI has to find and fix actual bugs. A human-checked version of the original SWE-Bench. Higher is better. | 77.4% | — |
Science GPQA DiamondGraduate-level science questions in biology, physics, and chemistry — hard enough that subject-matter PhDs score around 65%. Higher is better. | 89.5% | — |
Multimodal MMMUTests the AI on understanding images and text together across many college subjects. Higher is better. | 80.4% | — |
| Timeline | ||
| Release gap | gpt-oss-20b shipped 246 days before Muse Spark | |
Muse Spark and gpt-oss-20b don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. gpt-oss-20b shipped 246 days before Muse Spark, so benchmark comparisons should account for the intervening progress.
gpt-oss-20b is an open-source / open-weight model; Muse Spark is proprietary.
Direct benchmark comparisons are unavailable — Muse Spark and gpt-oss-20b don't publish scores on any of the same benchmarks.