Private AI
Step3 is a cutting-edge multimodal reasoning model—built on a Mixture-of-Experts architecture with 321B total parameters and 38B active. It is designed end-to-end to minimize decoding costs while delivering top-tier performance in vision–language reasoning. Through the co-design of Multi-Matrix Factorization Attention (MFA) and Attention-FFN Disaggregation (AFD), Step3 maintains exceptional efficiency across both flagship and low-end accelerators.
Added Jul 31, 2025
Context Window
65.5K
Max Output
8.2K
Input Price (Auto)
$0.25/1M
Output Price (Auto)
$0.65/1M
Cache Read (Auto)
$0.12/1M
Performance metrics and benchmarks
Sourced from LMArena.
Arena Score
1348.4
Overall Rank
#183 / 376
Votes
6,536
Confidence Interval
1341.0 - 1355.8
Coding
#169 / 371
1,230 votes
1408.4
Math
#169 / 364
352 votes
1363.4
Longer Query
#186 / 354
1,258 votes
1347.6
Creative Writing
#190 / 374
785 votes
1309.0
Instruction Following
#175 / 376
1,638 votes
1345.5
Hard Prompts
#169 / 376
3,004 votes
1378.4
Auto routing is available for this model. Explicit provider selection is not available.
Loading provider options…
German
#135 / 279
145 votes
1362.3
Spanish
#136 / 261
194 votes
1377.9
Chinese
#156 / 346
230 votes
1394.7
Industry Mathematical
#156 / 357
306 votes
1378.3
Hard Prompts English
#160 / 375
1,562 votes
1402.7
Industry Business And Management And Financial Operations
#172 / 369
1,159 votes
1356.5
Expert
#173 / 324
258 votes
1360.4
Industry Entertainment And Sports And Media
#174 / 374
1,101 votes
1323.2
Industry Software And It Services
#175 / 376
2,180 votes
1391.8
English
#177 / 376
3,158 votes
1373.4
Industry Medicine And Healthcare
#179 / 345
347 votes
1366.8
Polish
#180 / 203
428 votes
1292.5
Exclude Ties
#183 / 376
4,640 votes
1308.7
Korean
#183 / 250
192 votes
1251.9
Multi Turn
#186 / 374
1,115 votes
1342.0
Non English
#192 / 376
3,375 votes
1321.9
Industry Writing And Literature And Language
#194 / 375
1,408 votes
1317.7
Russian
#194 / 338
404 votes
1326.2
Industry Life And Physical And Social Science
#200 / 374
1,079 votes
1351.8
Industry Legal And Government
#202 / 348
417 votes
1342.2
Published 2026-07-16 · Matched as step-3
LMArena Dataset