Step 3.5 Flash API Cost Calculator
Estimate your monthly API costs for Step 3.5 Flash from Stepfun.
Pricing per 1M tokens
Pricing last verified: Mar 21, 2026
30-Day Price History
Solid line: input price · Dashed line: output price
Estimate Your Costs
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Cost Breakdown
Compare with Similar Models
| Model | Input/1M | Output/1M |
|---|---|---|
| Step 3.5 Flash (free) Stepfun | $0.00 | $0.00 |
| Molmo2 8B Allenai | $0.2000 | $0.2000 |
| Gemini 2.5 Flash Lite Google | $0.1000 | $0.3000 |
| Devstral Small 1.1 Mistralai | $0.1000 | $0.3000 |
| Ministral 3 14B 2512 Mistralai | $0.2000 | $0.2000 |
Frequently Asked Questions
How much does Step 3.5 Flash cost per token?
Step 3.5 Flash is priced at $0.1000 per 1M input tokens and $0.3000 per 1M output tokens. Use the calculator above to estimate your monthly costs based on your usage volume.
What is the context window for Step 3.5 Flash?
Step 3.5 Flash has a context window of 256K tokens (256,000 tokens). The maximum output length is 256K tokens.
Does Step 3.5 Flash support function calling (tool use)?
Yes, Step 3.5 Flash supports function calling (also called tool use). You can define custom functions that the model can invoke as part of its responses.
How does Step 3.5 Flash compare to similar models?
Step 3.5 Flash costs $0.1000 input and $0.3000 output per 1M tokens. Step 3.5 Flash (free) is less expensive at $0.00 input and $0.00 output per 1M tokens. See the "Compare with Similar Models" table above, or visit the Step 3.5 Flash (free) page at /tools/cost-calculator/stepfun/step-3-5-flash-free.