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GPT-5.1-Codex-Max vs Muse Spark
GPT-5.1-Codex-Max (OpenAI) and Muse Spark (Meta AI) compared on benchmarks, pricing, context window, and use-case rankings.
- Muse Spark ranks higher for coding (79th vs 69th percentile).
| Attribute | GPT-5.1-Codex-Max | Muse Spark |
|---|---|---|
| Scores | ||
| Intelligence (ECI) | — | 154 |
| Coding | 69 | 79 |
| Math | — | 66 |
| Reasoning & Knowledge | — | 84 |
| Agentic & Tools | 50 | 64 |
| Specifications | ||
| Developer | OpenAI | Meta AI |
| Family | GPT | — |
| Released | Nov 19, 2025 | Apr 8, 2026 |
| Parameters | — | — |
| Availability | API access | API access |
| Context window | 400K | — |
| Price — $/M input | $1.25 | — |
| Price — $/M output | $10.00 | — |
| Inputs | text, image | — |
| Outputs | text | — |
| Benchmarks | ||
| METR task horizon | 2.7 h | — |
| Terminal-Bench | 60% | — |
| AIME 2024/2025 | — | 89% |
| FrontierMath | — | 39% |
| FrontierMath Tier 4 | — | 15% |
| GPQA Diamond | — | 90% |
| Humanity's Last Exam | — | 41% |
| SciCode | — | 52% |
| SimpleQA Verified | — | 66% |
| 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
Which is better for coding, GPT-5.1-Codex-Max or Muse Spark?
Across coding benchmarks like SWE-bench Verified and Terminal-Bench, Muse Spark ranks higher — 79th vs 69th percentile among the models tracked on Model Beat.
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Benchmarks & model data from Epoch AI (CC BY); pricing & specs from OpenRouter. ECI = Epoch Capabilities Index.