Claude Opus 4.5 vs GPT-5
Anthropic Claude Opus 4.5 | OpenAI GPT-5 | |
|---|---|---|
| Overview | ||
| Company | Anthropic | OpenAI |
| Release date | Nov 24 2025 | Aug 7 2025 |
| Access | Proprietary | Proprietary |
| Benchmarks | ||
Nonsense detection BullshitBench v2Given a confidently-worded but nonsensical prompt, does the AI spot that it makes no sense and push back — instead of playing along and inventing an answer? The score is how often it clearly called out the nonsense. Higher is better. | 90%Best | 21% |
Coding SWE-Bench VerifiedReal coding tasks pulled from open-source projects — the AI has to find and fix actual bugs. A human-checked version of the original SWE-Bench. Higher is better. | 80.9% | — |
Science GPQA DiamondGraduate-level science questions in biology, physics, and chemistry — hard enough that subject-matter PhDs score around 65%. Higher is better. | 87% | — |
Community preference (code) Arena Elo (Code)Like the text arena, but people vote on which AI writes better code. The votes become a chess-style Elo rating on arena.ai. Higher is better. | — | 1394 |
| Timeline | ||
| Release gap | GPT-5 shipped 109 days before Claude Opus 4.5 | |
Which is better: Claude Opus 4.5 or GPT-5?
Claude Opus 4.5 leads GPT-5 on 1 of the 1 benchmark they both report (BullshitBench v2). GPT-5 shipped 109 days before Claude Opus 4.5, so benchmark comparisons should account for the intervening progress.
Published specifications for these two models are limited — see each model page for the latest details.
On BullshitBench v2, Claude Opus 4.5 leads at 90% vs GPT-5 at 21%.
Frequently asked questions
Claude Opus 4.5 was released by Anthropic on Nov 24 2025.
GPT-5 was released by OpenAI on Aug 7 2025.
Other comparisons
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