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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.
—24B
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.
1M128k
Benchmarks
SWE-Bench VerifiedCoding — Real coding tasks pulled from open-source projects — the AI has to find and fix actual bugs. A human-checked version of the original SWE-Bench. Higher is better.
95.5%46.8%
Overview
CompanyAnthropicMistral
Release dateJun 9 2026May 21 2025
AccessClosedOpen Weight
Model detailsView modelView model

Frequently asked questions

Claude Mythos 5 leads Devstral Small on 1 of the 1 benchmark they both report (SWE-Bench Verified). Devstral Small shipped 384 days before Claude Mythos 5, so benchmark comparisons should account for the intervening progress.

Context windows are 1M (Claude Mythos 5) vs 128k (Devstral Small). Claude Mythos 5 is closed, while Devstral Small is open weight.

On SWE-Bench Verified, Claude Mythos 5 leads at 95.5% vs Devstral Small at 46.8%.