Step 3.5 Flashopen
StepFun
54.0#112 of 427 overall
- Input / output
- US$ 0,10 / US$ 0,30 US$ per 1M tokens
- Context
- 262K tokens
- Release
- 01/29/2026 release date
- Speed
- 0 tok/s first token in 0.00 s
Family history
The 2 versions of this family, from first to newest, by release date. Click a point to open that version.
See the data as a table
| Model | Released | Score | Rank | Elo Arena |
|---|---|---|---|---|
| Step 3.5 Flash | 01/29/2026 | 54.0 | #112 | 1403 |
| Step 3.7 Flash | 05/28/2026 | 59.5 | #83 | — |
Scores by source
Scores by sourcepercentile = % of ranked models it beats| Metric | Value | Percentile | Source |
|---|---|---|---|
| Arena text (Elo) weight 2 | 1403 | 46% | LMArena |
| Humanity's Last Exam weight 1 | 24.5 | 73% | Artificial Analysis |
| GPQA Diamond | 82.6 | 72% | Artificial Analysis |
| Long-context reasoning | 63.0 | 53% | Artificial Analysis |
By category
| Category | Score | Rank | Metrics |
|---|---|---|---|
| Reasoning | 65.1 | #111 | Humanity's Last Exam, GPQA Diamond |
| Research | 51.3 | #164 | Long-context reasoning |
| Chat | 48.1 | #106 | Arena text (Elo) |
History
RankingIA score on each collection day (hover to see the rank).
Daily collection started on 10/30/2026. The chart appears from the second day the model is ranked.