Step-3

step-3

BackTry Model

Step-3

step-3

BackTry Model

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

Benchmarks

Performance metrics and benchmarks

Sourced from LMArena.

Arena Score

1348.2

Overall Rank

#174 / 367

Votes

6,541

Confidence Interval

1340.8 - 1355.6

Category Scores

Coding

#160 / 362

1,233 votes

1408.0

Math

#161 / 356

351 votes

1363.7

Longer Query

#177 / 345

1,259 votes

1348.0

Creative Writing

#182 / 365

785 votes

1308.1

Instruction Following

#166 / 367

1,638 votes

1345.2

Hard Prompts

#160 / 367

3,005 votes

1378.3

Additional Categories

Providers

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