Leaderboard · Compare · Grok 4 vs Claude Opus 4.1 · Updated
Grok 4 vs Claude Opus 4.1
Grok 4 and Claude Opus 4.1 are nearly tied on the composite (83.6 vs 83.6). The right pick depends on price, context window, and which specific benchmarks matter for your workload.
At a glance
| Spec | Grok 4 | Claude Opus 4.1 |
|---|---|---|
| Provider | xAI | Anthropic |
| Released | 2025-07 | 2025-08 |
| Tier | frontier | frontier |
| License | Closed | Closed |
| Context window | 256k | 200k |
| $ in / out (per 1M) | $3.00 / $15.00 | $15.00 / $75.00 |
Benchmark scoreboard
Higher is better on every benchmark. Δ shows Grok 4 − Claude Opus 4.1.
| Benchmark | Grok 4 | Claude Opus 4.1 | Δ |
|---|---|---|---|
| Chatbot Arena Elo | 1378 | 1390 | -12 |
| MMLU-Pro | 86.6 | 87.0 | -0.4 |
| GPQA Diamond | 87.7 | 79.6 | +8.1 |
| MATH | 95.0 | 95.0 | +0.0 |
| HumanEval | 93.0 | 95.4 | -2.4 |
| SWE-Bench Verified | 72.0 | 74.5 | -2.5 |
Numbers compiled from provider technical reports and Chatbot Arena snapshots — see methodology.
OpenRouter routes Grok 4, Claude Opus 4.1, and 100+ other LLMs behind a single API key — pay-as-you-go, no monthly minimum, fallback if a provider is down. Try OpenRouter → (affiliate · supports this site)
Grok 4 vs Claude Opus 4.1: where each one wins
Grok 4 is stronger on
- GPQA
Claude Opus 4.1 is stronger on
- Arena
- MMLU-Pro
- HumanEval
- SWE-Bench
Cost comparison
At 10M tokens/day (50/50 split), Grok 4 costs ~$90.00/day vs $450.00/day for Claude Opus 4.1 — Grok 4 is the cheaper pick at this volume.
Verdict
Grok 4 and Claude Opus 4.1 are nearly tied on the composite (83.6 vs 83.6). The right pick depends on price, context window, and which specific benchmarks matter for your workload.
If you can only pick one and your workload is unclear, route via OpenRouter and switch by request — same key, no lock-in.
Frequently asked questions
Which is better, Grok 4 or Claude Opus 4.1?
Grok 4 and Claude Opus 4.1 are nearly tied on the composite (83.6 vs 83.6). The right pick depends on price, context window, and which specific benchmarks matter for your workload. Grok 4 wins on GPQA; Claude Opus 4.1 wins on Arena, MMLU-Pro, HumanEval, SWE-Bench.
What does Grok 4 cost compared to Claude Opus 4.1?
At 10M tokens/day (50/50 split), Grok 4 costs ~$90.00/day vs $450.00/day for Claude Opus 4.1 — Grok 4 is the cheaper pick at this volume.
What is the context window of Grok 4 vs Claude Opus 4.1?
Grok 4: 256k tokens. Claude Opus 4.1: 200k tokens. Grok 4 has the larger window — useful for long-document RAG and full-codebase prompting.
Is Grok 4 or Claude Opus 4.1 open source?
Grok 4: closed / proprietary. Claude Opus 4.1: closed / proprietary.
Can I try Grok 4 and Claude Opus 4.1 on the same API key?
Yes — OpenRouter routes both models behind a single key, so you can A/B test Grok 4 against Claude Opus 4.1 without juggling provider accounts.
Model deep-dives: Grok 4 · Claude Opus 4.1 · Full leaderboard
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