GPT-5 Pro vs Grok 4.5
GPT-5 Pro (OpenAI) and Grok 4.5 (xAI) compared on benchmarks, pricing, context window, and use-case rankings.
- Grok 4.5 leads on overall intelligence (ECI 154 vs 150).
- Grok 4.5 is cheaper on input tokens — $2.00 vs $15.00 per 1M.
- Grok 4.5 has a larger context window (500K vs 400K tokens).
| Attribute | GPT-5 Pro | Grok 4.5 |
|---|---|---|
| Scores | ||
| Intelligence (ECI) | 150 | 154 |
| Coding | — | 91 |
| Math | 71 | 85 |
| Reasoning & Knowledge | 54 | 70 |
| Agentic & Tools | — | 75 |
| Specifications | ||
| Developer | OpenAI | xAI |
| Family | GPT | Grok |
| Released | Oct 7, 2025 | Jul 8, 2026 |
| Parameters | — | — |
| Availability | API access | API access |
| Context window | 400K | 500K |
| Price — $/M input | $15.00 | $2.00 |
| Price — $/M output | $120.00 | $6.00 |
| Inputs | image, text, file | text, image, file |
| Outputs | text | text |
| Benchmarks | ||
| ARC-AGI | 70% | 87% |
| ARC-AGI-2 | 18% | 53% |
| FrontierMath Tier 4 | 15% | — |
| Humanity's Last Exam | 32% | 40% |
| SimpleBench | 62% | 70% |
| WeirdML | 60% | 46% |
| AIME 2024/2025 | — | 98% |
| APEX | — | 34% |
| GPQA Diamond | — | 93% |
| SciCode | — | 54% |
| SimpleQA Verified | — | 54% |
| 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.
Frequently asked questions
Is GPT-5 Pro better than Grok 4.5?
On Epoch AI's Capabilities Index, Grok 4.5 scores higher (154) than GPT-5 Pro (150). The right pick depends on your task — compare their coding, math, and reasoning scores in the table above.
Which is cheaper, GPT-5 Pro or Grok 4.5?
Grok 4.5 is cheaper on input tokens at $2.00 per million, versus $15.00 (representative OpenRouter pricing).
Which has a larger context window, GPT-5 Pro or Grok 4.5?
Grok 4.5 supports up to 500K tokens, compared with 400K for the other.
Want a different match-up? Open the compare tool to add or swap models.
More comparisons
Benchmarks & model data from Epoch AI (CC BY); pricing & specs from OpenRouter. ECI = Epoch Capabilities Index.