When was Mistral Medium 3.5 released?

Mistral Medium 3.5 was released by Mistral on Apr 29 2026.

When was GPT-5.2 released?

GPT-5.2 was released by OpenAI on Dec 11 2025.

Which is better at coding, Mistral Medium 3.5 or GPT-5.2?

On SWE-Bench Verified (real-world software-engineering tasks), GPT-5.2 leads — Mistral Medium 3.5 scores 77.6% and GPT-5.2 scores 80%.

Is Mistral Medium 3.5 or GPT-5.2 open source?

Mistral Medium 3.5 is an open-source / open-weight model released by Mistral. GPT-5.2 is a proprietary model released by OpenAI.

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Mistral Medium 3.5

Apr 29 2026

Home/Compare/Mistral Medium 3.5 vs GPT-5.2

Mistral Medium 3.5 vs GPT-5.2

0 vs 2 benchmarks won

	Mistral Mistral Medium 3.5	OpenAI GPT-5.2
Overview
Company	Mistral	OpenAI
Release date	Apr 29 2026	Dec 11 2025
Model type	—	—
Open source	Yes	No
Specifications
Parameters	128B	—
Context window	256k	—
Benchmarks
Science reasoning GPQA Diamond	—	92.4%
Software engineering SWE-Bench Verified	77.6%	80%
Multimodal understanding MMMU	—	—
Timeline
Release gap	GPT-5.2 shipped 139 days before Mistral Medium 3.5

Which is better: Mistral Medium 3.5 or GPT-5.2?

GPT-5.2 leads Mistral Medium 3.5 on 2 of the tracked benchmarks (GPQA Diamond, SWE-Bench Verified, MMMU). GPT-5.2 shipped 139 days before Mistral Medium 3.5, so benchmark comparisons should account for the intervening progress.

Mistral Medium 3.5 is an open-source / open-weight model; GPT-5.2 is proprietary.

On SWE-Bench Verified, GPT-5.2 scores 80%, 2.4 points above Mistral Medium 3.5 at 77.6%.

Frequently asked questions

When was Mistral Medium 3.5 released?: Mistral Medium 3.5 was released by Mistral on Apr 29 2026.
When was GPT-5.2 released?: GPT-5.2 was released by OpenAI on Dec 11 2025.
Which is better at coding, Mistral Medium 3.5 or GPT-5.2?: On SWE-Bench Verified (real-world software-engineering tasks), GPT-5.2 leads — Mistral Medium 3.5 scores 77.6% and GPT-5.2 scores 80%.
Is Mistral Medium 3.5 or GPT-5.2 open source?: Mistral Medium 3.5 is an open-source / open-weight model released by Mistral. GPT-5.2 is a proprietary model released by OpenAI.