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GPT-5 nano vs Grok 4.5
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| Attribute | GPT-5 nano | Grok 4.5 |
|---|---|---|
| Scores | ||
| Intelligence (ECI) | 141 | 154 |
| Coding | 25 | 89 |
| Math | 12 | 84 |
| Reasoning & Knowledge | 7 | 68 |
| Agentic & Tools | 9 | 74 |
| Specifications | ||
| Developer | OpenAI | xAI |
| Family | GPT | Grok |
| Released | Aug 7, 2025 | Jul 8, 2026 |
| Parameters | — | — |
| Availability | API access | API access |
| Context window | 400K | 500K |
| Price — $/M input | $0.05 | $2.00 |
| Price — $/M output | $0.40 | $6.00 |
| Inputs | text, image, file | text, image, file |
| Outputs | text | text |
| Benchmarks | ||
| AIME 2024/2025 | 81% | 98% |
| ARC-AGI | 21% | 87% |
| ARC-AGI-2 | 3% | 53% |
| FrontierMath | 8% | — |
| FrontierMath Tier 4 | 2% | — |
| GPQA Diamond | 69% | 93% |
| Humanity's Last Exam | 8% | 40% |
| LiveCodeBench | 79% | — |
| MATH Level 5 | 95% | — |
| MMLU-Pro | 78% | — |
| SciCode | 37% | 54% |
| SimpleQA Verified | 12% | 54% |
| Terminal-Bench | 22% | — |
| WeirdML | 38% | 46% |
| τ²-bench | 37% | — |
| APEX | — | 34% |
| SimpleBench | — | 70% |
| WebDev Arena | — | 1551 |
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.