Leaderboard · Compare · GPT-5 vs Claude Opus 4.1 · Updated
GPT-5 vs Claude Opus 4.1
GPT-5 edges out Claude Opus 4.1 on the composite (86.0 vs 83.6). The gap is meaningful but not decisive — see the per-benchmark breakdown below.
At a glance
| Spec | GPT-5 | Claude Opus 4.1 |
|---|---|---|
| Provider | OpenAI | Anthropic |
| Released | 2025-08 | 2025-08 |
| Tier | frontier | frontier |
| License | Closed | Closed |
| Context window | 400k | 200k |
| $ in / out (per 1M) | $1.25 / $10.00 | $15.00 / $75.00 |
Benchmark scoreboard
Higher is better on every benchmark. Δ shows GPT-5 − Claude Opus 4.1.
| Benchmark | GPT-5 | Claude Opus 4.1 | Δ |
|---|---|---|---|
| Chatbot Arena Elo | 1410 | 1390 | +20 |
| MMLU-Pro | 86.8 | 87.0 | -0.2 |
| GPQA Diamond | 87.3 | 79.6 | +7.7 |
| MATH | 96.7 | 95.0 | +1.7 |
| HumanEval | 95.1 | 95.4 | -0.3 |
| SWE-Bench Verified | 74.9 | 74.5 | +0.4 |
Numbers compiled from provider technical reports and Chatbot Arena snapshots — see methodology.
OpenRouter routes GPT-5, 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)
GPT-5 vs Claude Opus 4.1: where each one wins
GPT-5 is stronger on
- Arena
- GPQA
- MATH
- SWE-Bench
Claude Opus 4.1 is stronger on
- MMLU-Pro
- HumanEval
Cost comparison
At 10M tokens/day (50/50 split), GPT-5 costs ~$56.25/day vs $450.00/day for Claude Opus 4.1 — GPT-5 is the cheaper pick at this volume.
Verdict
GPT-5 edges out Claude Opus 4.1 on the composite (86.0 vs 83.6). The gap is meaningful but not decisive — see the per-benchmark breakdown below.
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, GPT-5 or Claude Opus 4.1?
GPT-5 edges out Claude Opus 4.1 on the composite (86.0 vs 83.6). The gap is meaningful but not decisive — see the per-benchmark breakdown below. GPT-5 wins on Arena, GPQA, MATH, SWE-Bench; Claude Opus 4.1 wins on MMLU-Pro, HumanEval.
What does GPT-5 cost compared to Claude Opus 4.1?
At 10M tokens/day (50/50 split), GPT-5 costs ~$56.25/day vs $450.00/day for Claude Opus 4.1 — GPT-5 is the cheaper pick at this volume.
What is the context window of GPT-5 vs Claude Opus 4.1?
GPT-5: 400k tokens. Claude Opus 4.1: 200k tokens. GPT-5 has the larger window — useful for long-document RAG and full-codebase prompting.
Is GPT-5 or Claude Opus 4.1 open source?
GPT-5: closed / proprietary. Claude Opus 4.1: closed / proprietary.
Can I try GPT-5 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 GPT-5 against Claude Opus 4.1 without juggling provider accounts.
Model deep-dives: GPT-5 · Claude Opus 4.1 · Full leaderboard
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