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GPT-5.5 Pro vs Muse Spark
GPT-5.5 Pro (OpenAI) and Muse Spark (Meta AI) compared on benchmarks, pricing, context window, and use-case rankings.
- GPT-5.5 Pro leads on overall intelligence (ECI 161 vs 154).
| Attribute | GPT-5.5 Pro | Muse Spark |
|---|---|---|
| Scores | ||
| Intelligence (ECI) | 161 | 154 |
| Coding | — | 79 |
| Math | 99 | 66 |
| Reasoning & Knowledge | 92 | 84 |
| Agentic & Tools | — | 64 |
| Specifications | ||
| Developer | OpenAI | Meta AI |
| Family | GPT | — |
| Released | Apr 23, 2026 | Apr 8, 2026 |
| Parameters | — | — |
| Availability | API access | API access |
| Context window | 1.1M | — |
| Price — $/M input | $30.00 | — |
| Price — $/M output | $180.00 | — |
| Inputs | file, image, text | — |
| Outputs | text | — |
| Benchmarks | ||
| AIME 2024/2025 | 100% | 89% |
| ARC-AGI | 97% | — |
| ARC-AGI-2 | 85% | — |
| FrontierMath | 52% | 39% |
| FrontierMath Tier 4 | 40% | 15% |
| GPQA Diamond | 94% | 90% |
| SimpleBench | 77% | — |
| SimpleQA Verified | 65% | 66% |
| Humanity's Last Exam | — | 41% |
| SciCode | — | 52% |
| WebDev Arena | — | 1513 |
| τ²-bench | — | 92% |
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.
Frequently asked questions
Is GPT-5.5 Pro better than Muse Spark?
On Epoch AI's Capabilities Index, GPT-5.5 Pro scores higher (161) than Muse Spark (154). The right pick depends on your task — compare their coding, math, and reasoning scores in the table above.
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Benchmarks & model data from Epoch AI (CC BY); pricing & specs from OpenRouter. ECI = Epoch Capabilities Index.