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. | 1M | 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. | ||
Terminal-Bench 4.0Agentic terminal coding — Can the AI work in a command-line terminal — running commands and finishing technical setup tasks the way a developer would? Version 4.0 recalibrated how much time, CPU and memory each task gets, removed eight tasks and fixed nineteen, so fewer runs fail for reasons that have nothing to do with the model. Scores are not comparable with earlier versions. Higher is better. | 60.9% | — |
| Overview | ||
| Company | Anthropic | OpenAI |
| Release date | Sep 1 2026 | Nov 19 2025 |
| Access | Closed | Closed |
| Model details | View model | View model |
Other comparisons
Claude Mythos 5.1vsGemini 4 ArgonGPT-5.1-Codex-MaxvsGemini 4 ArgonClaude Mythos 5.1vsMuse Spark OpenGPT-5.1-Codex-MaxvsMuse Spark OpenClaude Mythos 5.1vsGrok 4.7GPT-5.1-Codex-MaxvsGrok 4.7Claude Mythos 5.1vsDeepSeek-V4.1-Flash-1017GPT-5.1-Codex-MaxvsDeepSeek-V4.1-Flash-1017Claude Mythos 5.1vsMistral Large 4GPT-5.1-Codex-MaxvsMistral Large 4Claude Mythos 5.1vsKimi K3GPT-5.1-Codex-MaxvsKimi K3Frequently asked questions
Claude Mythos 5.1 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-5.1-Codex-Max shipped 286 days before Claude Mythos 5.1, so benchmark comparisons should account for the intervening progress.
Context windows are 1M (Claude Mythos 5.1) vs 400k (GPT-5.1-Codex-Max).
Direct benchmark comparisons are unavailable — Claude Mythos 5.1 and GPT-5.1-Codex-Max don't publish scores on any of the same benchmarks.