Compare AI models
| Specifications | ||
Context windowHow much information the model can work with in one request, measured in tokens — pieces of words or other data. This includes your question, attachments, conversation and reply. Limits can vary by model variant and provider. | 400k | 400k |
| 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. | — | $1.25Azure |
Cheapest outputLowest output rate across every provider on OpenRouter, the lab included. May come from a different provider than the cheapest input. | — | $10.00Azure |
| — | $750Azure | |
| These models have no shared benchmark scores. | ||
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. | 39% | — |
| Overview | ||
| Company | OpenAI | OpenAI |
| Release date | Sep 15 2025 | Nov 19 2025 |
| Access | Closed | Closed |
| Model details | View model | View model |
Other comparisons
GPT-5-CodexvsClaude Haiku 5.5GPT-5.1-Codex-MaxvsClaude Haiku 5.5GPT-5-CodexvsGemini 4 ArgonGPT-5.1-Codex-MaxvsGemini 4 ArgonGPT-5-CodexvsMuse Spark OpenGPT-5.1-Codex-MaxvsMuse Spark OpenGPT-5-CodexvsGrok 4.7GPT-5.1-Codex-MaxvsGrok 4.7GPT-5-CodexvsDeepSeek-V4.1-Flash-1017GPT-5.1-Codex-MaxvsDeepSeek-V4.1-Flash-1017GPT-5-CodexvsMistral Large 4GPT-5.1-Codex-MaxvsMistral Large 4Frequently asked questions
GPT-5-Codex and GPT-5.1-Codex-Max don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. GPT-5-Codex shipped 65 days before GPT-5.1-Codex-Max, so benchmark comparisons should account for the intervening progress.
Context windows are 400k (GPT-5-Codex) vs 400k (GPT-5.1-Codex-Max).
Direct benchmark comparisons are unavailable — GPT-5-Codex and GPT-5.1-Codex-Max don't publish scores on any of the same benchmarks.