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)
$0.22/1M
Output Price (Auto)
$0.57/1M
Cache Read (Auto)
$0.11/1M
Performance metrics and benchmarks
Sourced from LMArena.
Arena Score
1348.3
Overall Rank
#190 / 383
Votes
6,531
Confidence Interval
1340.9 - 1355.7
Coding
#176 / 378
1,231 votes
1408.1
Math
#175 / 370
352 votes
1363.3
Longer Query
#194 / 361
1,256 votes
1347.6
Creative Writing
#197 / 381
783 votes
1308.6
Instruction Following
#182 / 383
1,635 votes
1345.2
Hard Prompts
#176 / 383
3,001 votes
1378.2
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German
#143 / 287
145 votes
1362.6
Spanish
#146 / 269
194 votes
1377.3
Industry Mathematical
#164 / 365
305 votes
1376.8
Chinese
#165 / 355
230 votes
1394.1
Hard Prompts English
#167 / 382
1,560 votes
1401.9
Industry Business And Management And Financial Operations
#179 / 376
1,158 votes
1356.3
Industry Entertainment And Sports And Media
#181 / 381
1,099 votes
1323.6
Expert
#182 / 332
258 votes
1360.0
Industry Software And It Services
#182 / 383
2,181 votes
1391.3
English
#184 / 383
3,155 votes
1372.9
Industry Medicine And Healthcare
#187 / 353
347 votes
1367.0
Polish
#188 / 211
428 votes
1292.7
Exclude Ties
#190 / 383
4,636 votes
1308.6
Korean
#192 / 259
192 votes
1252.0
Multi Turn
#194 / 381
1,112 votes
1341.0
Non English
#199 / 383
3,373 votes
1322.1
Industry Writing And Literature And Language
#201 / 382
1,404 votes
1317.6
Russian
#203 / 346
404 votes
1325.7
Industry Life And Physical And Social Science
#207 / 381
1,079 votes
1351.9
Industry Legal And Government
#208 / 356
411 votes
1343.7
Published 2026-08-03 · Matched as step-3
LMArena Dataset