Compare AI models
| Specifications | ||
ParametersA rough measure of how big the model is. More parameters usually means more capable and more expensive to run, though it is a poor guide on its own — a smaller, newer model often beats a larger, older one. | — | 816B |
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 | 1M |
| These models have no shared benchmark scores. | ||
DeepSWE 1.1Agentic coding — Artificial Analysis' independent test of deep, agentic software-engineering work — the AI has to plan and carry out substantial coding tasks end to end. (Version 1.1 of the test.) Higher is better. | — | 60% |
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% | — |
Terminal-Bench 2.1Agentic terminal coding — Can the AI work in a command-line terminal — running commands and finishing technical setup tasks the way a developer would? Higher is better. | — | 76.4% |
MCP AtlasMulti-step tool use — Can the AI chain together many tools and steps to complete one bigger task, rather than doing just a single thing? Higher is better. | — | 89.2% |
JobBenchProfessional tool use — Tests the AI on professional workplace tasks that require using real work tools — the kind of multi-step jobs an office worker handles. Higher is better. | — | 61.8% |
GDPval-AA v2Knowledge work — economically valuable knowledge work (v2, re-based Elo) | — | 1401 |
| Overview | ||
| Company | Anthropic | Meta |
| Release date | Sep 1 2026 | Oct 15 2026 |
| Access | Closed | Open Weight |
| Model details | View model | View model |
Other comparisons
Claude Mythos 5.1vsGPT-6.1 SolMuse Spark OpenvsGPT-6.1 SolClaude Mythos 5.1vsGemini 4 ArgonMuse Spark OpenvsGemini 4 ArgonClaude Mythos 5.1vsGrok 4.7Muse Spark OpenvsGrok 4.7Claude Mythos 5.1vsDeepSeek-V4.1-FlashMuse Spark OpenvsDeepSeek-V4.1-FlashClaude Mythos 5.1vsMistral Large 4Muse Spark OpenvsMistral Large 4Claude Mythos 5.1vsKimi K3Muse Spark OpenvsKimi K3Frequently asked questions
Claude Mythos 5.1 and Muse Spark Open don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. Claude Mythos 5.1 shipped 44 days before Muse Spark Open, so benchmark comparisons should account for the intervening progress.
Context windows are 1M (Claude Mythos 5.1) vs 1M (Muse Spark Open). Claude Mythos 5.1 is closed, while Muse Spark Open is open weight.
Direct benchmark comparisons are unavailable — Claude Mythos 5.1 and Muse Spark Open don't publish scores on any of the same benchmarks.