Step 3
StepFun
Key facts · verified Oct 29, 2026
Step 3 is a StepFun model. Its API price is $0.57 per million input tokens and $1.42 per million output tokens. Its context window is 65.5K tokens. It ranks #221 on LMArena's text leaderboard (Elo 1349, read 1 Nov 2026). Source: huggingface.co.
Step 3 is a model from StepFun. It is listed at $0.57 per million input tokens and $1.42 per million output, with a context window of 65.5K tokens. On LMArena's text leaderboard it scores 1349 Elo (rank 221). Its strongest category there is hard prompts, at 207th, and its weakest is legal and government work, at 247th. The weights are available under the Apache 2.0 licence, so it can be self-hosted. Figures here come from LMArena’s published dataset rather than from the vendor’s own documentation.
Pricing & specs checkedSource: vendor documentation · checked Oct 29, 2026LMArena: 1349 Elo (rank 221) · source · retrieved Nov 1, 2026
Full Specifications
$0.57 / $1.42 per million tokens | |
|---|---|
| Identity | |
| Developer | StepFun |
| Licence | Apache 2.0 |
| Self-hostable | Yes |
| Cost | |
| Blended $/1M tokensinput × 0.75 + output × 0.25 | $0.782 / 1M tokens |
| Input price | $0.570 / 1M tokens |
| Output price | $1.420 / 1M tokens |
| Capacity | |
| Context window | 65.5K tokens |
| Measured quality | |
| LMArena Elo | 1349 (checked Nov 2026) |
| LMArena rank | Rank 221 |
| Elo per dollarLMArena Elo ÷ blended $/1M tokens | 1724 |