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Moonshot AI
Kimi K2 Thinking
Released Nov 6, 2025 · knowledge cutoff 2025-04
- Status
- Superseded
- Location
- China
- Modality
- Text
- Context window
- 262K
- Max output
- 66K
- Speed
- —
- Price ($/MTok in / out)
- $0.60 / $2.50
- Cost per task
- —
- Open weights
- Yes
Benchmarks6 of 8 reported
MMLU-Pro
84.6%
GPQA Diamond
84.5%
SWE-bench Verified
71.3%
AIME (latest)
94.5%
Humanity's Last Exam
23.9%
LMArena Elo
1417
Terminal-Bench 2.1
—
ARC-AGI-2
—
Strengths & weaknesses
Strengths
- Chains hundreds of tool calls without losing the goal — rare stamina for an open model
- Research-style depth close to closed models of its moment
- Weights available, so the entire agent loop can run in-house
Weaknesses
- Slow, and it deliberates on nearly everything whether or not it needs to
- Needs low-precision serving to be practical, which is fiddly to set up correctly
The strongest open reasoning model as of late 2025.
For developers
API model strings
Not researched
Licence
Not researched
Retirement
No retirement announced
Lineage
No recorded predecessor