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Step 3.5 Flash: price, performance and context
Open Step 3.5 Flash by StepFun costs $0.10 per 1M input and $0.30 per 1M output tokens, handles up to 262.1K tokens in one request (≈ 790 pages of text) and scores 17 points on the AgentKernel performance index, rank 108 of 212.
Privacy: zero data retention with one provider, not in the EU. Availability over the last 24 h: 100%.
Open in the interactive comparisonKey facts
- Licence
- Open weights: free to download and self-host
- Input / 1M tokens
- $0.10
- Output / 1M tokens
- $0.30
- Context window
- 262.1K tokens
- Max. output
- 65.5K tokens
- Performance index
- 17 points · rank 108 of 212
- Coding index
- n/a
- Agentic index
- n/a
- Cost at your usage
- $0.175 / month
- Knowledge cutoff
- n/a
- In the catalog since
- Jan 29, 2026
- Capabilities
- Reasoning, Tool Calling
What do you get for $10.00?
Rules of thumb from the cost calculator, base rates without caching or taxes.
| Task | Cost per task | For $10.00 |
|---|---|---|
| Chat repliesA question with a short history, a detailed answer | $0.00 | 56,000 |
| Email draftsBullet points in, a finished email out | $0.00 | 69,000 |
| Document summariesRead 10 pages, write a one-page summary | $0.00 | 21,000 |
| Code reviewsReview and comment on 500 lines of code | $0.001 | 12,000 |
| Book analysesAnalyse a 300-page book in one go | $0.011 | 940 |
Cheaper with similar performance
| Model | Licence | Performance | Your cost / month |
|---|---|---|---|
| Ling 3.1 FlashinclusionAI | Proprietary | 41.1 | $0.00 |
| Ling 3.0 Flash VLinclusionAI | Open | 24.6 | $0.036 |
| Ling 3.0 FlashinclusionAI | Open | 20.1 | $0.037 |
Stronger models
| Model | Licence | Performance | Your cost / month |
|---|---|---|---|
| Muse Glimmer 30BMeta | Open | 17.5 | $0.60 |
| Qwen3.5-122B-A10BQwen | Open | 17.7 | $0.78 |
| Qwen3.6 35B A3BQwen | Open | 18.2 | $0.40 |