When was Mistral Medium 3.5 released?

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

Who made Mistral Medium 3.5?

Mistral Medium 3.5 was built by Mistral. French AI company building open and commercial models. Founded in 2023 by former Meta and DeepMind researchers.

How much does Mistral Medium 3.5 cost?

Mistral Medium 3.5 costs $1.50 per million input tokens and $7.50 per million output tokens through the Mistral API. Rates are pay-as-you-go API prices verified against Mistral's published pricing on August 18, 2026.

What benchmark scores did Mistral Medium 3.5 get?

Mistral Medium 3.5 reports 1 tracked benchmark score — SWE-Bench Verified: 77.6%. Tracked scores may come from lab reports or independent benchmarks; source details accompany the benchmark data.

What is the context window of Mistral Medium 3.5?

Mistral Medium 3.5 has a context window of 256k. That is the maximum amount of input plus output the model can hold in a single request.

How many parameters does Mistral Medium 3.5 have?

Mistral Medium 3.5 is reported at 128B parameters.

Is Mistral Medium 3.5 open source?

Partly. Mistral Medium 3.5 is an open-weight model: the trained weights are free to download and run locally or on your own infrastructure, but the training data and code are not fully released and the license may restrict some commercial uses. It is not open source in the strict sense.

What came before and after Mistral Medium 3.5?

Mistral's previous tracked release was Mistral Small 4 on Mar 16 2026, 44 days earlier. It was followed by Mistral Large 4 on Oct 6 2026.

Mistral Medium 3.5Open Weight

Released Apr 29 2026

Mistral Medium 3.5 is an AI model released by Mistral on Wednesday, Apr 29 2026, 44 days after Mistral Small 4. It is an open-weight model — the trained weights are available to download and run. It is a 128B parameter model with a 256k token context window. Benchmark results (shown below) cover SWE-Bench Verified.

API pricing

Input: $1.50
Output: $7.50

Reasoning or thinking is supported.

USD per 1M tokens

Available from


Mistral	—	zdr	$1.50	$7.50	256K
Mistral	—	—	$1.50	$7.50	256K
Mistral	eu	—	$1.65	$8.25	256K

USD per 1M tokens

Benchmarks

SWE-Bench Verified

77.6%

#21 of 57

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Mistral Medium 3.5

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Frequently asked questions

: Mistral Medium 3.5 was released by Mistral on Wednesday, Apr 29 2026.
: Mistral Medium 3.5 was built by Mistral. French AI company building open and commercial models. Founded in 2023 by former Meta and DeepMind researchers.
: Mistral Medium 3.5 costs $1.50 per million input tokens and $7.50 per million output tokens through the Mistral API. Rates are pay-as-you-go API prices verified against Mistral's published pricing on August 18, 2026.
: Mistral Medium 3.5 reports 1 tracked benchmark score — SWE-Bench Verified: 77.6%. Tracked scores may come from lab reports or independent benchmarks; source details accompany the benchmark data.
: Mistral Medium 3.5 has a context window of 256k. That is the maximum amount of input plus output the model can hold in a single request.
: Mistral Medium 3.5 is reported at 128B parameters.
: Partly. Mistral Medium 3.5 is an open-weight model: the trained weights are free to download and run locally or on your own infrastructure, but the training data and code are not fully released and the license may restrict some commercial uses. It is not open source in the strict sense.
: Mistral's previous tracked release was Mistral Small 4 on Mar 16 2026, 44 days earlier. It was followed by Mistral Large 4 on Oct 6 2026.