Step 3.5 Flash pricing
Source: openrouter · updated 2026-10-28
Short answer: Step 3.5 Flash costs $0.100 per million input tokens and $0.300 per million output tokens. That is a 3:1 blended rate of $0.150 per million tokens, ranking it #126 of 713 tracked models by input price.
Price breakdown
| Metric | USD |
|---|---|
| Input, per 1M tokens | $0.100 |
| Output, per 1M tokens | $0.300 |
| Output รท input multiple | 3.00× |
| 3:1 blended, per 1M tokens | $0.150 |
| Context window | 262,144 tokens |
What a typical workload costs
| Monthly volume | Input cost | Output cost | Total | 1M in / 250K out | $0.100 | $0.075 | $0.175 |
|---|---|---|---|---|---|---|---|
| 10M in / 2.5M out | $1.00 | $0.750 | $1.75 | ||||
| 100M in / 25M out | $10.00 | $7.50 | $17.50 |
Other stepfun models
| Model | Input | Output |
|---|---|---|
| Step 3.7 Flash | $0.200 | $1.15 |
| Step 5 Preview | $1.00 | $2.70 |
Compare against
Cheaper alternatives
Next cheaper option: Qwen 3 14 B at $0.120 per 1M input tokens. Next step up: Us Gov Openai GPT OSS 20 B1.0 at $0.084 per 1M input tokens.