Step 3.5 Flash API Pricing
StepFun · released 2026-01-29
Also searched as: 3.5 Flash pricing
Step 3.5 Flash price
0.010¢ / 1K
0.031¢ / 1K
0.016¢ / 1K
China-region price; check the official site; Single public source; verify on the official site
Official list price from StepFun, as recorded by models.dev
Official price changed on 2026-11-06: input $0.10 → $0.1046 (+4.6%) · output $0.30 → $0.3138 (+4.6%) per 1M tokens. All official price changes
What it actually costs
| Workload | Tokens | Cost |
|---|---|---|
| Short chat reply | 500 in / 300 out | 0.0146¢ |
| RAG query | 4,000 in / 500 out | 0.0575¢ |
| Long document summary | 50,000 in / 1,000 out | 0.554¢ |
| Code review of a 2k-line file | 30,000 in / 2,000 out | 0.377¢ |
| 1,000 chat replies/day for 30 days | 30,000 × (500 in / 300 out) | $4.39 |
Cost = (input tokens ÷ 1,000,000 × $0.1046) + (output tokens ÷ 1,000,000 × $0.3138).
Benchmarks
| Benchmark | Value | Source | As of |
|---|---|---|---|
| Epoch Capabilities Index (ECI) | No public data yet | ||
| Epoch Mock AIME accuracy | No public data yet | ||
| Epoch FrontierMath (T1–3) accuracy | No public data yet | ||
| Arena text rating | 1393 | arena | 2026-10-28 |
| Arena coding rating (human preference votes, not task accuracy) | 1449 | arena | 2026-10-28 |
| Arena math rating | 1407 | arena | 2026-10-28 |
| Arena WebDev rating | No public data yet | ||
More from StepFun
| Model | Released | Blended $/1M |
|---|---|---|
| Step 5 Preview | 2026-09-16 | $1.5318 |
| Step 3.7 Flash | 2026-05-29 | $0.4539 |
| Step 3.5 Flash 2603 | 2026-04-02 | $0.1569 |
Count tokens & estimate cost for Step 3.5 Flash
Prices: StepFun's official list price as recorded by models.dev; benchmarks: see sources below; last synced 2026-11-06.
FAQ
Who develops Step 3.5 Flash?
Step 3.5 Flash is developed by StepFun, released 2026-01-29.
How much does Step 3.5 Flash cost per million tokens?
Step 3.5 Flash costs $0.1046 per 1M input tokens and $0.3138 per 1M output tokens ($0.1569 blended), per StepFun's official list price as recorded by models.dev.
What is the Step 3.5 Flash API price?
The Step 3.5 Flash API price is $0.1046 per 1M input tokens and $0.3138 per 1M output tokens ($0.1569 per 1M blended).
How much does Step 3.5 Flash cost for a typical request?
A short chat reply (500 in / 300 out tokens) costs about 0.0146¢ on Step 3.5 Flash, at $0.1046/1M input and $0.3138/1M output.
Is Step 3.5 Flash free?
Step 3.5 Flash's official API list price is $0.1046 per 1M input tokens and $0.3138 per 1M output tokens. This site tracks list prices only, not free tiers or trial credits — check StepFun's site for those.
Where does this data come from?
Pricing for Step 3.5 Flash comes from models.dev and LiteLLM (open MIT-licensed catalogs); benchmark scores come from Epoch AI and LMArena (open CC BY 4.0 licenses) — see /data-sources/. Last synced 2026-11-06.