AI Model Atlas / Stepfun
Step 3.7 Flash
One million input tokens cost $0.20 and one million output tokens $1.15. Context window: 262k tokens, about 437 A4 pages.
What it costs in practice
Pricing per million tokens doesn't mean anything to anyone, so I convert it to three tasks that people actually give to models. The usage assumptions are listed for each row so you can verify them.
| Task | Input | Output | Cost |
|---|---|---|---|
| 1500-word articlebrief plus finished text in English | 1,500 tokens | 2,200 tokens | $0.0028 |
| 100 chat queries700 tokens per question and 400 per answer | 70,000 tokens | 40,000 tokens | $0.06 |
| Hour of work with an agentagent reads repository and writes fixes | 250,000 tokens | 30,000 tokens | $0.08 |
Technical details
| Provider | Stepfun |
| Modalities | text + image + video → text |
| Context window | 262k tokens (~437 A4 pages) |
| Maximum response | 230k tokens |
| Step-by-step reasoning | yes |
| Tool calling | yes |
| Forced JSON format | yes |
| Knowledge cutoff | not specified |
| Cache read | $0.040 per million |
| Content moderation | no extra filter |
How it compares to the rest
The database contains 468 models. In terms of input pricing Step 3.7 Flash is more expensive than 29 percent of paid models. A longer context window is available in 255 models.
Input price history
2026-09-08 · $0.202026-11-12 · $0.20
The chart shows the price of a million input tokens on consecutive measurement days. History starts on the day I launched the atlas and grows with each day. I don't backfill data.
Alternatives at a similar price
Models from other providers whose cost for the same article comes out closest.
| Model | Input / M | Output / M | 1500-word article | Context |
|---|---|---|---|---|
| MiniMax M2.5MiniMax | $0.27 | $1.08 | $0.0028 | 200k |
| GLM 5.3 (batch)Z.ai | $0.35 | $1.08 | $0.0029 | 1M |
| GLM 5.2 (batch)Z.ai | $0.35 | $1.08 | $0.0029 | 1M |
| Morph V3 Large (batch)Morph | $0.45 | $0.95 | $0.0028 | 262k |
Compare Step 3.7 Flash with another model or go back to the full database 468 models.