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Devstral 2 (123B) vs Kimi K2.5

0 vs 2 benchmarks won

Mistral
Devstral 2 (123B)
Moonshot AI
Kimi K2.5
Overview
CompanyMistralMoonshot AI
Release dateDec 9 2025Jan 27 2026
Model type
Open sourceYesYes
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 gapDevstral 2 (123B) shipped 49 days before Kimi K2.5

Which is better: Devstral 2 (123B) or Kimi K2.5?

Kimi K2.5 leads Devstral 2 (123B) on 2 of the tracked benchmarks (GPQA Diamond, SWE-Bench Verified, MMMU). Devstral 2 (123B) shipped 49 days before Kimi K2.5, so benchmark comparisons should account for the intervening progress.

Published specifications for these two models are limited — see each model page for the latest details.

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 Devstral 2 (123B) released?
Devstral 2 (123B) was released by Mistral on Dec 9 2025.
When was Kimi K2.5 released?
Kimi K2.5 was released by Moonshot AI on Jan 27 2026.

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