Mistral retires Medium 3.1 and Medium 3 today; migrate to 3.5
Both endpoints go dark after 3 months' notice; the drop-in is Medium 3.5 at 256K context, and OpenAI's Sora-2 and last GPT-3.5 models retire next month.
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The deadline is today
Mistral shuts off the mistral-medium-3.1 and mistral-medium-3 API strings today, Aug 31, after roughly three months' notice from May 22. Any request still pointed at those model IDs stops resolving — check yours before it breaks.
Medium 3.5 is a same-endpoint swap
The named replacement, Mistral Medium 3.5, keeps your endpoint, auth, and region unchanged — you change the model string and you're done. It's a 256K-context multimodal model tuned for agents and coding at $1.50/$7.50 per million tokens, shipped as open weights under a Modified MIT license.
Grep for hard-coded model IDs first
The clean migration: search your codebase for medium-3 and medium-3.1, route them to medium-3.5, and test latency and outputs before flipping production. Same provider means no infrastructure changes.
What's next on the retirement calendar
The cleanup wave continues: OpenAI's Videos API and every Sora-2 variant retire Sept 24 with no replacement named, and the last GPT-3.5 models — gpt-3.5-turbo-instruct, babbage-002, davinci-002 — shut down Sept 28 in favor of gpt-5.6-terra. Mark the dates.