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. | 32k | 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 | |
| Overview | ||
| Company | OpenAI | |
| Release date | Feb 8 2024 | Nov 19 2025 |
| Access | Closed | Closed |
| Model details | View model | View model |
Other comparisons
Gemini 1.0 UltravsClaude Haiku 5.5GPT-5.1-Codex-MaxvsClaude Haiku 5.5Gemini 1.0 UltravsMuse Spark OpenGPT-5.1-Codex-MaxvsMuse Spark OpenGemini 1.0 UltravsGrok 4.7GPT-5.1-Codex-MaxvsGrok 4.7Gemini 1.0 UltravsDeepSeek-V4.1-Flash-1017GPT-5.1-Codex-MaxvsDeepSeek-V4.1-Flash-1017Gemini 1.0 UltravsMistral Large 4GPT-5.1-Codex-MaxvsMistral Large 4Gemini 1.0 UltravsKimi K3GPT-5.1-Codex-MaxvsKimi K3Frequently asked questions
Gemini 1.0 Ultra 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. Gemini 1.0 Ultra shipped 650 days before GPT-5.1-Codex-Max, so benchmark comparisons should account for the intervening progress.
Context windows are 32k (Gemini 1.0 Ultra) vs 400k (GPT-5.1-Codex-Max).
Direct benchmark comparisons are unavailable — Gemini 1.0 Ultra and GPT-5.1-Codex-Max don't publish scores on any of the same benchmarks.