Compare AI models
| Specifications | ||
Context windowHow much text the model can hold in mind at once — your question, any documents you attach, the conversation so far, and its own reply. Go past it and the earliest part falls out of view. | 1M | 128k |
| API pricingUSD per 1M tokens · lower wins | ||
Input priceWhat you pay for everything you send the model — your question, plus any documents or earlier conversation you include with it. | — | $10.00 |
Output priceWhat you pay for the text the model writes back. It is normally the dearer half: producing an answer costs more than reading one. | — | $30.00 |
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. | — | $10.00OpenAI |
Cheapest outputLowest output rate across every provider on OpenRouter, the lab included. May come from a different provider than the cheapest input. | — | $30.00OpenAI |
| — | $3,500OpenAI list price | |
| 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% | — |
GPQA DiamondScience — Graduate-level science questions in biology, physics, and chemistry — hard enough that subject-matter PhDs score around 65%. Higher is better. | — | 42.5% |
| Overview | ||
| Company | Anthropic | OpenAI |
| Release date | Sep 1 2026 | Nov 6 2023 |
| Access | Closed | Closed |
| Model details | View model | View model |
Other comparisons
Claude Mythos 5.1vsGemini 4 ArgonGPT-4 TurbovsGemini 4 ArgonClaude Mythos 5.1vsMuse Spark OpenGPT-4 TurbovsMuse Spark OpenClaude Mythos 5.1vsGrok 4.7GPT-4 TurbovsGrok 4.7Claude Mythos 5.1vsDeepSeek-V4.1-FlashGPT-4 TurbovsDeepSeek-V4.1-FlashClaude Mythos 5.1vsMistral Large 4GPT-4 TurbovsMistral Large 4Claude Mythos 5.1vsKimi K3GPT-4 TurbovsKimi K3Frequently asked questions
Claude Mythos 5.1 and GPT-4 Turbo don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. Only GPT-4 Turbo has a verified first-party API price: $10.00 per million input tokens and $30.00 per million output tokens. No pay-as-you-go API rate is tracked for Claude Mythos 5.1. GPT-4 Turbo shipped 1030 days before Claude Mythos 5.1, so benchmark comparisons should account for the intervening progress.
Context windows are 1M (Claude Mythos 5.1) vs 128k (GPT-4 Turbo).
Direct benchmark comparisons are unavailable — Claude Mythos 5.1 and GPT-4 Turbo don't publish scores on any of the same benchmarks.