GPT-5.6 Sol vs Grok 4
GPT-5.6 Sol (OpenAI) and Grok 4 (xAI) compared on benchmarks, pricing, context window, and use-case rankings.
- GPT-5.6 Sol leads on overall intelligence (ECI 161 vs 147).
- GPT-5.6 Sol ranks higher for coding (94th vs 43th percentile).
| Attribute | GPT-5.6 Sol | Grok 4 |
|---|---|---|
| Scores | ||
| Intelligence (ECI) | 161 | 147 |
| Coding | 94 | 43 |
| Math | 97 | 23 |
| Reasoning & Knowledge | 94 | 47 |
| Agentic & Tools | 65 | 15 |
| Specifications | ||
| Developer | OpenAI | xAI |
| Family | GPT | Grok |
| Released | Jul 9, 2026 | Jul 9, 2025 |
| Parameters | — | 3T |
| Availability | API access | API access |
| Context window | 1.1M | — |
| Price — $/M input | $5.00 | — |
| Price — $/M output | $30.00 | — |
| Inputs | file, image, text | — |
| Outputs | text | — |
| Benchmarks | ||
| AIME 2024/2025 | 100% | 84% |
| APEX | 40% | 15% |
| ARC-AGI | 98% | 67% |
| ARC-AGI-2 | 93% | 16% |
| GPQA Diamond | 93% | 87% |
| Humanity's Last Exam | 50% | 27% |
| SciCode | 56% | 46% |
| SimpleBench | 72% | 61% |
| SimpleQA Verified | 72% | 48% |
| WebDev Arena | 1620 | — |
| WeirdML | 89% | 46% |
| τ²-bench | 85% | 75% |
| FrontierMath | — | 20% |
| FrontierMath Tier 4 | — | 2% |
| GDPval (win/tie rate) | — | 24% |
| LiveCodeBench | — | 82% |
| METR task horizon | — | 1.8 h |
| MMLU-Pro | — | 87% |
| Terminal-Bench | — | 27% |
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-5.6 Sol better than Grok 4?
On Epoch AI's Capabilities Index, GPT-5.6 Sol scores higher (161) than Grok 4 (147). The right pick depends on your task — compare their coding, math, and reasoning scores in the table above.
Which is better for coding, GPT-5.6 Sol or Grok 4?
Across coding benchmarks like SWE-bench Verified and Terminal-Bench, GPT-5.6 Sol ranks higher — 94th vs 43th 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.