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The Hugging Face[4] weights for Mistral[1][7]-Medium-3.5-128B first appear on 29 April 2026 and creativeainews's[5] 29 April report says 'On April 29, 2026, Mistral released Medium 3.5'; Mistral's docs changelog dates the API entry one day earlier (April 28) and its announcement page carries a later 22 May stamp, so 29 April is the public launch day.Mistral AI releases Mistral Medium 3.5, its first merged flagship: a 128B dense open-weight model with a 256K context window that scores 77.6% on SWE-Bench Verified and costs $1.50 per million input tokens and $7.50 per million output tokens.
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