Step 3.5 Flash
stepfun/step-3.5-flash
StepFun: Step 3.5 Flash is a text‑only model from stepfun released on 2026‑01‑29. It supports a context window of 262,144 tokens, tool integration, and reasoning features, with open weights available. Pricing is $0.10 per M input tokens and $0.30 per M output tokens.
- tool use
- reasoning
- open-weight
At a glance
Specifications
What the API gives you
- Context window
- 262K tokens
- Max output
- 66K tokens
- Input price
- $0.100 / 1M tokens
- Output price
- $0.30 / 1M tokens
- Cache read
- —
- Modalities
- text → text
- Knowledge cutoff
- —
- Released
- Jan 29, 2026
Recommendation coverage
Where this model appears
Not currently included in a published recommendation. This means the available task-specific evidence did not support a ranking yet—not that the model was reviewed and rejected.
Benchmarks
No independent benchmark results are linked to this model yet. We keep it visible while withholding quality claims until usable results arrive.
Open-weight model on Hugging Face.
Catalog data via OpenRouter and models.dev. Last checked within the past 6 hours.