Mistral · Mistral Medium line · lightweight · open weights
Mistral Medium 3.5 was released by Mistral on April 29, 2026, as an open-weights lightweight model in the Mistral Medium line.
Mistral Medium 3.5 merges instruction-following, reasoning and coding into one 128B dense model released with open weights, with configurable reasoning effort and a 256k-token context window, double Mistral Medium 3.1's 128k.
Compared with Mistral Medium 3.1 · the model it replaces
Fixes almost 8 in 10 real bugs from real software projects
SWE-Bench Verified — fixing real bugs in real software projects
77.6%
✦ ahead of Devstral 2, which it replaces in Mistral Vibe
What developers pay to use it through Mistral's API
API price per 1M tokens — input / output
$1.50 / $7.50
✦ launch price on Mistral's API
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Mistral Medium 3.5 is the current model in this line. The card shows how long it has been since the last release against the line's usual gap and its recent ones — the rhythm, not a date.
Latest: Mistral Medium 3.5 · Apr 29, 2026
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