A.X K2 measured on 3 of 28 Coding benchmarks3
BenchmarkByScoreRank
Coding1
Agents2
No benchmark matches
—per task?
self-host onlyprice
—output speed?
262Kcontext
Alternatives?
ModelScoreCostPer taskWhat changes
BetterGPT-6 Lunamedium+2.5—$0.017Function calling only with none · Chat Completions+3
OpenGLM 5.3max+41.9—$2.01Memory (4-bit): 415 GB → 452 GB+4
BetterClaude Haiku 5.5low+12.6—$0.024Remove sampling parameters+5BetterGPT-5.6 Lunahigh+2.5—$0.044
BetterMiMo v2.6 FlashthinkingOpen+22.7—$0.062Pass back reasoning_content+3ModelScoreCostPer taskWhat changes
Nothing here yet.
ModelScoreCostPer taskWhat changes
GPT-6 Lunamedium+2.5—$0.017Function calling only with none · Chat Completions+3Claude Haiku 5.5low+12.6—$0.024Remove sampling parameters+5GPT-5.6 Lunahigh+2.5—$0.044MiMo v2.6 FlashthinkingOpen+22.7—$0.062Pass back reasoning_content+3GPT-6.1 Sollow+30.8—$0.13Remove unsupported parameters+5ModelScoreCostPer taskWhat changes
GLM 5.3maxOpen+41.9—$2.01Memory (4-bit): 415 GB → 452 GB+4MiMo v2.6 ProthinkingOpen+34.8—$0.13Memory (4-bit): 415 GB → 615 GB+4
DeepSeek V4.1 Flash 1017maxOpen+33.8—$0.26Memory (4-bit): 415 GB → 458 GB+5
Ling 3.1 FlashOpen+33.3—$1.00
Step 5 PreviewthinkingOpen+33.3—$1.03web_search not available · Chat Completions+2Run it yourself
estimateFits on✗ 8 GB (phone, laptop)✗ 16 GB✗ 24 GB GPU✗ 48 GB GPU✗ 80 GB GPU
LicenceApache-2.0free for commercial use
FAQ
How much does A.X K2 cost?›
There is no per-unit API price: self-host only.
Is A.X K2 free to use?›
There is no free API. The weights are open, so you can run it yourself.
How good is A.X K2, and what is it best at?›
#83 of 334 in Chat & Knowledge, #75 of 132 in Coding, #94 of 133 in Agents & Tool Use, #76 of 133 in Vision & Documents. Strongest at: Reasoning, Science.
Is A.X K2 better than MiMo v2.5 Pro?›
On Terminal-Bench 4.0, A.X K2 scores 0 vs 0 — about the same.
What is the context window of A.X K2?›
262K tokens.
When was A.X K2 released? Is there a newer version?›
Released 2026-08-12. It is the current version in its line.
Is A.X K2 open source?›
Yes, the weights are open (Apache-2.0 licence).
Can I run A.X K2 locally?›
The weights are open and can be self-hosted; hardware needs are not confirmed yet.
Can A.X K2 read images?›
No, it accepts text only.
What is A.X K2?›
A.X K2 is an open-weights language model from SK Telecom, released Aug 2026.
What are the best alternatives to A.X K2?›
GPT-6 Luna (better), GLM 5.3 (open weights).