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 | 128k |
| 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 | Feb 27 2025 |
| Access | Closed | Closed |
| Model details | View model | View model |
Other comparisons
Claude Mythos 5.1vsGemini 4 ArgonGPT-4.5vsGemini 4 ArgonClaude Mythos 5.1vsMuse Spark OpenGPT-4.5vsMuse Spark OpenClaude Mythos 5.1vsGrok 4.7GPT-4.5vsGrok 4.7Claude Mythos 5.1vsDeepSeek-V4.1-Flash-1017GPT-4.5vsDeepSeek-V4.1-Flash-1017Claude Mythos 5.1vsMistral Large 4GPT-4.5vsMistral Large 4Claude Mythos 5.1vsKimi K3GPT-4.5vsKimi K3Frequently asked questions
Claude Mythos 5.1 and GPT-4.5 don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. GPT-4.5 shipped 551 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-4.5).
Direct benchmark comparisons are unavailable — Claude Mythos 5.1 and GPT-4.5 don't publish scores on any of the same benchmarks.