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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.
—1.8B/3.25B
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.
1M32k
These models have no shared benchmark scores.
Overview
CompanyAnthropicGoogle
Release dateSep 1 2026Dec 6 2023
AccessClosedClosed
Model detailsView modelView model

Frequently asked questions

Claude Mythos 5.1 and Gemini 1.0 Nano don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. Gemini 1.0 Nano shipped 1000 days before Claude Mythos 5.1, so benchmark comparisons should account for the intervening progress.

Context windows are 1M (Claude Mythos 5.1) vs 32k (Gemini 1.0 Nano).

Direct benchmark comparisons are unavailable — Claude Mythos 5.1 and Gemini 1.0 Nano don't publish scores on any of the same benchmarks.