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Step 5 Preview
Step 5 Preview is an open-weight model from StepFun, released Oct 8, 2026. It ranks #74 of 351 on the LMArena text leaderboard with a rating of 1442. It costs $1 per million input tokens and $2.70 per million output tokens, with a 1M-token context window.
- Developer
- StepFun
- Released
- Oct 8, 2026
- Context window
- 1M
- Price in / out, per 1M tokens
- $1 / $2.70
- Weights
- Open
- Inputs
- Text, Images, Video
- Reasoning
- Yes
- Tool use
- Yes
- Hugging Face downloads, 30 days
- 2.9K
- Hugging Face likes
- 129
The rating LMArena published at each update since Oct 2, 2026. Ratings move as votes come in and new models join.
Benchmarks
| Benchmark | Score bar | Accuracy | Rank | Cost / test |
|---|---|---|---|---|
| Terminal-Bench 4.0Coding | 31.82% | 20 / 55 | $3.11 | |
| Vibe Code BenchCoding | 70.40% | 42 / 115 | $5.86 | |
| Code MigrationCoding | 47.00% | 17 / 28 | $8.61 | |
| Finance AgentFinance | 58.90% | 22 / 31 | $0.58 | |
| Finance IndexFinance | 55.43% | 23 / 31 | $0.82 | |
| Tax Agent BenchFinance | 27.27% | 34 / 76 | $0.55 | |
| Legal Research BenchLaw | 40.38% | 31 / 85 | $0.84 | |
| Terminal-Bench ScienceReasoning | 2.86% | 32 / 42 | $4.25 |
Vals AI, as of Oct 24, 2026.
LMArena, by category
| Leaderboard | Rating | Rank | Votes |
|---|---|---|---|
| TextLMArena | 1442 | 74 / 351 | 9.8K |
| CodingLMArena | 1484 | 49 / 346 | 2.3K |
| MathLMArena | 1454 | 70 / 339 | 499 |
| Creative writingLMArena | 1411 | 80 / 349 | 2.1K |
| Instruction followingLMArena | 1441 | 59 / 351 | 3.4K |
| Hard promptsLMArena | 1463 | 52 / 351 | 6.1K |
| Multi-turnLMArena | 1438 | 89 / 349 | 1.4K |
| Long queriesLMArena | 1450 | 63 / 330 | 4.1K |
| ExpertLMArena | 1477 | 55 / 305 | 981 |
| Legal and governmentIndustries | 1441 | 84 / 325 | 822 |
| Medicine and healthcareIndustries | 1439 | 100 / 325 | 681 |
| Business and financeIndustries | 1441 | 53 / 344 | 1.7K |
| ChineseLanguages | 1494 | 61 / 328 | 780 |
| SpanishLanguages | 1440 | 84 / 249 | 369 |
| GermanLanguages | 1451 | 52 / 261 | 162 |
| FrenchLanguages | 1443 | 102 / 252 | 427 |
| JapaneseLanguages | 1377 | 103 / 236 | 184 |
| WebDevLMArena | 1568 | 40 / 124 | 5.2K |
| VisionLMArena | 1265 | 49 / 146 | 1.6K |
LMArena, CC BY 4.0, as of Oct 22, 2026. Where a model is rated at several effort levels, its best is shown (Step 5 Preview, Step 5 Preview (High)).
Compare Step 5 Preview
StepFun
Builds the Step family of large multimodal models. Founded 2023, based in Shanghai. stepfun.com
Questions
Who makes Step 5 Preview?
Step 5 Preview is made by StepFun, founded 2023 and based in Shanghai.
How much does Step 5 Preview cost?
$1 per million input tokens and $2.70 per million output tokens, at its provider’s list price.
What is Step 5 Preview’s context window?
1M tokens (1,048,576).
How does Step 5 Preview rank?
#74 of 351 on LMArena’s text leaderboard, rated 1442 (95% interval 1435–1449) from 9,792 votes, as of Oct 22, 2026.
Is Step 5 Preview open source?
Step 5 Preview has open weights, downloadable from Hugging Face (stepfun-ai/Step-5-Preview).