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
#181 / 374
Votes
6,534
Confidence Interval
1341.0 - 1355.8
Coding
#167 / 369
1,231 votes
1408.3
Math
#164 / 360
352 votes
1363.7
Longer Query
#185 / 352
1,257 votes
1347.4
Creative Writing
#188 / 372
783 votes
1308.7
Instruction Following
#173 / 374
1,638 votes
1345.3
Hard Prompts
#167 / 374
3,002 votes
1378.3
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German
#133 / 277
145 votes
1362.3
Spanish
#134 / 259
194 votes
1378.0
Chinese
#152 / 342
230 votes
1394.8
Industry Mathematical
#153 / 354
305 votes
1377.4
Hard Prompts English
#158 / 373
1,562 votes
1402.2
Industry Business And Management And Financial Operations
#170 / 367
1,158 votes
1356.9
Expert
#171 / 322
259 votes
1360.7
Industry Entertainment And Sports And Media
#172 / 372
1,100 votes
1323.6
Industry Software And It Services
#173 / 374
2,180 votes
1391.5
English
#175 / 374
3,156 votes
1373.2
Industry Medicine And Healthcare
#177 / 343
347 votes
1366.6
Polish
#179 / 201
428 votes
1292.4
Korean
#180 / 247
193 votes
1250.6
Exclude Ties
#181 / 374
4,638 votes
1308.6
Multi Turn
#185 / 372
1,114 votes
1341.5
Non English
#190 / 374
3,375 votes
1322.0
Industry Writing And Literature And Language
#192 / 373
1,407 votes
1318.0
Russian
#192 / 336
403 votes
1326.1
Industry Life And Physical And Social Science
#198 / 372
1,079 votes
1351.7
Industry Legal And Government
#200 / 346
415 votes
1342.0
Published 2026-07-10 · Matched as step-3
LMArena Dataset