Compare AI models
| API pricingUSD per 1M tokens · lower wins | ||
Cheapest inputLowest input rate across every provider on OpenRouter, the lab included. The cheapest endpoint may run a quantised build or a shorter context — see "Available from" on the model page. | $15.00Amazon Bedrock | — |
Cheapest outputLowest output rate across every provider on OpenRouter, the lab included. May come from a different provider than the cheapest input. | $75.00Amazon Bedrock | — |
| $6,750Amazon Bedrock | — | |
| Benchmarks | ||
BullshitBench v2Nonsense detection — Given 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. | 43% | 39% |
SWE-Bench VerifiedCoding — Real 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. | 74.5% | — |
GPQA DiamondScience — Graduate-level science questions in biology, physics, and chemistry — hard enough that subject-matter PhDs score around 65%. Higher is better. | 80.9% | — |
| Overview | ||
| Company | Anthropic | OpenAI |
| Release date | Aug 5 2025 | Sep 15 2025 |
| Access | Closed | Closed |
| Model details | View model | View model |
Other comparisons
Claude Opus 4.1vsGemini 4 ArgonGPT-5-CodexvsGemini 4 ArgonClaude Opus 4.1vsMuse WonderGPT-5-CodexvsMuse WonderClaude Opus 4.1vsGrok 4.7GPT-5-CodexvsGrok 4.7Claude Opus 4.1vsDeepSeek-V4.1-FlashGPT-5-CodexvsDeepSeek-V4.1-FlashClaude Opus 4.1vsMistral Large 4GPT-5-CodexvsMistral Large 4Claude Opus 4.1vsKimi K3GPT-5-CodexvsKimi K3Frequently asked questions
Claude Opus 4.1 leads GPT-5-Codex on 1 of the 1 benchmark they both report (BullshitBench v2). Claude Opus 4.1 shipped 41 days before GPT-5-Codex, 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 4.1 leads at 43% vs GPT-5-Codex at 39%.