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gpt-oss-20b vs Muse Spark
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| Attribute | gpt-oss-20b | Muse Spark |
|---|---|---|
| Scores | ||
| Intelligence (ECI) | — | 153 |
| Coding | 19 | 77 |
| Math | 47 | 64 |
| Reasoning & Knowledge | 11 | 82 |
| Agentic & Tools | 11 | 63 |
| Specifications | ||
| Developer | OpenAI | Meta AI |
| Family | GPT | — |
| Released | Aug 5, 2025 | Apr 8, 2026 |
| Parameters | 20.9B | — |
| Availability | Open weights (unrestricted) | API access |
| Context window | 131K | — |
| Price — $/M input | $0.03 | — |
| Price — $/M output | $0.14 | — |
| Inputs | text | — |
| Outputs | text | — |
| Benchmarks | ||
| AIME 2024/2025 | 89% | 89% |
| GPQA Diamond | 69% | 90% |
| Humanity's Last Exam | 10% | 41% |
| LiveCodeBench | 78% | — |
| MMLU-Pro | 75% | — |
| SciCode | 34% | 52% |
| Terminal-Bench | 3% | — |
| WeirdML | 41% | — |
| τ²-bench | 60% | 92% |
| FrontierMath | — | 39% |
| FrontierMath Tier 4 | — | 15% |
| SimpleQA Verified | — | 66% |
| WebDev Arena | — | 1513 |
Use-case scores are 0–100 percentile composites across each area’s benchmarks, ranked against every model from the past year. Highlighted cells lead each row. Open a model for the full picture.
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Benchmarks & model data from Epoch AI (CC BY); pricing & specs from OpenRouter. ECI = Epoch Capabilities Index.