Claude Opus 4.5 vs Grok 4.5
Claude Opus 4.5 (Anthropic) 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 $5.00 per 1M.
- Grok 4.5 has a larger context window (500K vs 200K tokens).
- Grok 4.5 ranks higher for coding (91th vs 72th percentile).
| Attribute | Claude Opus 4.5 | Grok 4.5 |
|---|---|---|
| Scores | ||
| Intelligence (ECI) | 150 | 154 |
| Coding | 72 | 91 |
| Math | 31 | 85 |
| Reasoning & Knowledge | 63 | 70 |
| Agentic & Tools | 63 | 75 |
| Specifications | ||
| Developer | Anthropic | xAI |
| Family | Claude | Grok |
| Released | Nov 24, 2025 | Jul 8, 2026 |
| Parameters | — | — |
| Availability | API access | API access |
| Context window | 200K | 500K |
| Price — $/M input | $5.00 | $2.00 |
| Price — $/M output | $25.00 | $6.00 |
| Inputs | file, image, text | text, image, file |
| Outputs | text | text |
| Benchmarks | ||
| AIME 2024/2025 | 86% | 98% |
| APEX | 21% | 34% |
| ARC-AGI | 80% | 87% |
| ARC-AGI-2 | 38% | 53% |
| FrontierMath | 21% | — |
| FrontierMath Tier 4 | 4% | — |
| GDPval (win/tie rate) | 60% | — |
| GPQA Diamond | 86% | 93% |
| GSO (code optimization) | 27% | — |
| Humanity's Last Exam | 25% | 40% |
| LiveCodeBench | 87% | — |
| METR task horizon | 4.9 h | — |
| MMLU-Pro | 90% | — |
| SciCode | 50% | 54% |
| SimpleBench | 62% | 70% |
| SimpleQA Verified | 42% | 54% |
| SWE-bench Verified | 77% | — |
| Terminal-Bench | 63% | — |
| WebDev Arena | 1512 | 1551 |
| WeirdML | 64% | 46% |
| τ²-bench | 89% | — |
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 Claude Opus 4.5 better than Grok 4.5?
On Epoch AI's Capabilities Index, Grok 4.5 scores higher (154) than Claude Opus 4.5 (150). The right pick depends on your task — compare their coding, math, and reasoning scores in the table above.
Which is cheaper, Claude Opus 4.5 or Grok 4.5?
Grok 4.5 is cheaper on input tokens at $2.00 per million, versus $5.00 (representative OpenRouter pricing).
Which has a larger context window, Claude Opus 4.5 or Grok 4.5?
Grok 4.5 supports up to 500K tokens, compared with 200K for the other.
Which is better for coding, Claude Opus 4.5 or Grok 4.5?
Across coding benchmarks like SWE-bench Verified and Terminal-Bench, Grok 4.5 ranks higher — 91th vs 72th 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.