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Specifications
ParametersThe learned values that shape how a model responds. B means billion and T means trillion. For mixture-of-experts models, the total count is larger than the number active for each token. Parameter count alone does not measure quality.
—314B
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.
1M8k
These models have no shared benchmark scores.
Overview
CompanyAnthropicSpaceXSI
Release dateSep 1 2026Nov 3 2023
AccessClosedOpen Weight
Model detailsView modelView model

Other comparisons

Claude Mythos 5.1vsGPT-6.1 SolGrok‑1vsGPT-6.1 SolClaude Mythos 5.1vsGemini 4 ArgonGrok‑1vsGemini 4 ArgonClaude Mythos 5.1vsMuse Spark OpenGrok‑1vsMuse Spark OpenClaude Mythos 5.1vsDeepSeek-V4.1-Flash-1017Grok‑1vsDeepSeek-V4.1-Flash-1017Claude Mythos 5.1vsMistral Large 4Grok‑1vsMistral Large 4Claude Mythos 5.1vsKimi K3Grok‑1vsKimi K3

Frequently asked questions

Claude Mythos 5.1 and Grok‑1 don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. Grok‑1 shipped 1033 days before Claude Mythos 5.1, so benchmark comparisons should account for the intervening progress.

Context windows are 1M (Claude Mythos 5.1) vs 8k (Grok‑1). Claude Mythos 5.1 is closed, while Grok‑1 is open weight.

Direct benchmark comparisons are unavailable — Claude Mythos 5.1 and Grok‑1 don't publish scores on any of the same benchmarks.