AI Model Release Tracker - Timeline of Major AI Models from 2022-2026

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Mistral Medium vs Kimi K2.5

0 vs 2 benchmarks won

Mistral
Mistral Medium
Moonshot AI
Kimi K2.5
Overview
CompanyMistralMoonshot AI
Release dateDec 2023Jan 27 2026
Model type
Open sourceNoYes
Specifications
Parameters
1T
Context window
256k
Benchmarks
Science reasoning
GPQA Diamond
87.6%
Software engineering
SWE-Bench Verified
76.8%
Multimodal understanding
MMMU
Timeline
Release gapMistral Medium shipped 788 days before Kimi K2.5

Which is better: Mistral Medium or Kimi K2.5?

Kimi K2.5 leads Mistral Medium on 2 of the tracked benchmarks (GPQA Diamond, SWE-Bench Verified, MMMU). Mistral Medium shipped 788 days before Kimi K2.5, so benchmark comparisons should account for the intervening progress.

Kimi K2.5 is an open-source / open-weight model; Mistral Medium is proprietary.

Direct benchmark comparisons are unavailable — at least one of these models has not published scores on GPQA Diamond, SWE-Bench Verified, or MMMU.

Frequently asked questions

When was Mistral Medium released?
Mistral Medium was released by Mistral on Dec 2023.
When was Kimi K2.5 released?
Kimi K2.5 was released by Moonshot AI on Jan 27 2026.
Is Mistral Medium or Kimi K2.5 open source?
Kimi K2.5 is an open-source / open-weight model released by Moonshot AI. Mistral Medium is a proprietary model released by Mistral.

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