whatmodel.sh / Step 5 Preview
Step 5 Preview
↗ share
+ contribute
Step 5 Preview is a closed-weights language model from StepFun. Licence: proprietary.
Catalogue identity notes
Exact Arena entry 'Step 5 Preview' in the October 2026 pinned dataset. Comparison identity; no public run route inferred from leaderboard inclusion.
$ how it compares
The LLMs ranked either side of Step 5 Preview, out of 828 with a score, then more from StepFun.
| # | model | score | where | ||
|---|---|---|---|---|---|
| 43 |  Muse Spark 1.1 | 75±1 | api $2.00/M | ||
| 44 | Muse Spark | 75±2 | comparison only | ||
| 45 | Step 5 Preview | 75±1 | comparison only | ||
| 46 |  Claude Sonnet 5 | 75±1 | api $4.00/M | ||
| 47 |  Grok 4.7 | 75±1 | api $3.00/M | ||
| more from StepFun | |||||
| 115 | Step 3.5 Flash (196B-A11B) | 68±1 | api $0.15/M +local | ||
| 132 | Step 3.7 Flash (198B-A11B) | 67±1 | api $0.44/M +local | ||
$ what it's good at
agent tasks▁▁▂▆█▆▅▄▄▃▂▁ #39 of 340 * · 36% of its score · 1 test
Beats Gemini 3.7 Flash, Qwen3.8-Flash-Next, Qwen3.8-Omni-Flash here, though they rank higher overall. Trails GLM-5.3-Flash, Grok 4.7, Claude Sonnet 5 here, though they rank lower overall.
| test | result | vs the others in its run | counts |
|---|---|---|---|
| Arena Agent (October 2026 aggregate IPS) | 0.0048 IPS ✎ | ▁▁▁▄▂▃▇█▂▂▁▃ beats 21/49 | 36% |
coding▁▁▁▃▅▇█▇▅▄▃▁ #34 of 524 * · 32% of its score · 1 test
Beats GPT-5.5, GPT-5.6 Terra, Claude Opus 4.8 here, though they rank higher overall. Trails Qwen3.8 27B, GLM-5.2, GLM-5.3-Flash here, though they rank lower overall.
| test | result | vs the others in its run | counts |
|---|---|---|---|
| Arena WebDev (Code Arena) | 1570.2 ✎ | ▁▂▄▃▅█▄▇▆▄▁▁ beats 88/119 | 32% |
chat & writing▁▁▁▃▅▄▆█▇▇▇▃ #56 of 463 * · 18% of its score · 1 test
Beats MiMo-V2.6-Flash (309B-A15B), GPT-6 Luna, GPT-5.6 Luna here, though they rank higher overall. Trails Claude Sonnet 4.5, Gemini 3.5 Flash-Lite, MiMo-V2.5-Pro (1T-A42B) here, though they rank lower overall.
| test | result | vs the others in its run | counts |
|---|---|---|---|
| LMArena (text) | 1453.7 ✎ | ▁▁▁▂▃▃▃▆▆▇█▃ beats 319/379 | 18% |
vision & documents▁▁▃▃▂▃▅▄▇▇█▃ #43 of 182 * · 12% of its score · 1 test
Beats MiMo-V2.6-Pro, MiMo-V2.6-Flash (309B-A15B), DeepSeek V4 Flash Vision (Exp) here, though they rank higher overall. Trails Qwen3.6 Flash, Qwen3.6 Plus, Qwen3.5 397B-A17B here, though they rank lower overall.
| test | result | vs the others in its run | counts |
|---|---|---|---|
| Arena vision (style controlled) | 1259.7 ✎ | ▁▁▂▂▂▂▄▅▅▆██ beats 108/145 | 12% |
$ where to run it
No verified API or download recorded yet · add one
$ how the score was worked out · LMArena leaderboard dataset 99%
Each result implies a score on its own, after adjusting for how hard its test is and who ran it. The score is their weighted average, with a small pull toward the middle for thinly tested models. Each test's weight is its counts column above; here it's added up by who ran the tests. How it works
| source | results | share of the score |
|---|---|---|
 LMArena leaderboard dataset | 4 | 99% |
| prior · pull toward the middle | 1% | |
| weighted average | = 75.0 |
$ improve this page
Use a short GitHub form or edit the data through a pull request. Every number needs a source; here's which ones we can use.
data updated · sources and licences · json