token.app › Compare › Grok 4.5 vs Claude Opus 5
Grok 4.5 vs Claude Opus 5
Claude Opus 5 leads on 5 of 5 shared benchmarks. Grok 4.5 is 3.3× cheaper per token on a blended 3:1 basis. Claude Opus 5 accepts the larger context window (1M).
Head to head
Blended price uses a 3:1 input:output mix
| Grok 4.5 | Claude Opus 5 | |
|---|---|---|
| Provider | xAI | Anthropic |
| Input $/1M | $2.00 | $5.00 |
| Output $/1M | $6.00 | $25.00 |
| Blended $/1M | $3.00 | $10.00 |
| Context window | 500K | 1M |
| Max output | — | 128K |
| Released | Jul 2026 | Jul 2026 |
| Licence | Proprietary | Proprietary |
| GPQA Diamond | 93.4% | 93.9% |
| FrontierMath T1–3 | 57.2% | 85.6% |
| FrontierMath T4 | 24.4% | 73.2% |
| SimpleQA Verified | 53.5% | 56.7% |
| OTIS Mock AIME | 97.8% | 98.9% |
Benchmark scores independently run and published by Epoch AI, 'AI Benchmarking Hub', used under CC BY 4.0. Only benchmarks with a score for BOTH models are compared.
Choose Grok 4.5 if…
- Costs less per token — $3.00 vs $10.00 blended
Choose Claude Opus 5 if…
- Higher GPQA Diamond (93.9% vs 93.4%)
- Higher FrontierMath T1–3 (85.6% vs 57.2%)
- Higher FrontierMath T4 (73.2% vs 24.4%)
- Higher SimpleQA Verified (56.7% vs 53.5%)
- Larger context window (1M)
- Newer model (released Jul 2026)
FAQ
Which is better, Grok 4.5 or Claude Opus 5?
Across the 5 benchmarks both models have independently-run scores for, Grok 4.5 leads on 0 and Claude Opus 5 leads on 5. Benchmarks are one input — price and context window are on this page too.
Is Grok 4.5 cheaper than Claude Opus 5?
Grok 4.5 is cheaper: $3.00 versus $10.00 per million tokens blended at 3:1 input:output. Input alone: $2.00 vs $5.00. Output alone: $6.00 vs $25.00.
What context windows do Grok 4.5 and Claude Opus 5 have?
Grok 4.5: 500,000 tokens. Claude Opus 5: 1,000,000 tokens.
Who makes Grok 4.5 and Claude Opus 5?
Grok 4.5 is made by xAI. Claude Opus 5 is made by Anthropic.