Step 3.5 Flash API Pricing / Price per 1M tokens
阶跃星辰 (StepFun) • API Price Comparison
Also known as: stepfun-step-3-5-flash · stepfun step 3 5 flash · stepfunstep35flash · stepfun-step3-5-flash · stepfun step3 5 flash · step-3.5-flash · step3.5flash · step3.5-flash · step3.5 flash
API pricing and token costs at a glance
Updated on · Published currencies / per 1M tokens; cheapest ranked by input
| Channel | Input / 1M | Output / 1M | Cache read / 1M | Updated / verified on |
|---|---|---|---|---|
| 阶跃星辰 (StepFun)Official | CNY 0.7 | CNY 2.1 | CNY 0.14 | 2026-10-31 |
| OpenRouterLowest input | USD 0.1 | USD 0.3 | — | 2026-10-31 |
Metered API cost = input tokens / 1M × input rate + output tokens / 1M × output rate. At the lowest-input-rate channel, 1M input plus 250K output tokens costs approximately USD 0.175. This excludes caching, tools, retries and other service fees; the lowest input rate does not guarantee the lowest total bill.
— means the price or date is not recorded. Cross-currency ranking uses exchange rates.
Step 3.5 Flash is a large language model by 阶跃星辰 (StepFun) with a 256K-token context window. Across the 2 API channels tracked here, input pricing ranges from $0.10–$0.10 per 1M input tokens (USD-normalized); the cheapest is OpenRouter at $0.10 per 1M input tokens. The official channel (阶跃星辰 (StepFun)) charges ¥0.70 per 1M input tokens and ¥2.10 per 1M output tokens. Channels reachable from mainland China without a VPN include 阶跃星辰 (StepFun). Prices are collected daily from official provider pages and every tracked channel, then cross-checked by a data-accuracy audit.
Model performance benchmarks
Scores retain their original benchmark, version and metric. We do not combine them into a site-wide score; results from different versions are not directly comparable.
| Channel | Type | Input / 1M | Output / 1M | Rate Limit | China | vs Official | |
|---|---|---|---|---|---|---|---|
OpenRouter3 variants💰 Best Price | Aggregator | $0.10 | $0.30 | - | - | -1.4% | |
Show all price variants for this channelOpenRouter Auto / default routeDefault $0.10 / $0.30 per 1M default_route Cheapest endpoint: SiliconFlow $0.10 / $0.30 per 1M cheapest_endpoint SiliconFlow | stepfun/step-3.5-flash $0.10 / $0.30 per 1M upstream_provider | |||||||
阶跃星辰 (StepFun)🏢 Official | Official | ¥0.70 | ¥2.10 | - | Baseline | ||
| Usage Level | Tokens/Month | OpenRouter | 阶跃星辰 (StepFun) |
|---|---|---|---|
| 🐣 Light | 0.1M in + 0.1M out | $0.03 | $0.03 |
| 📊 Medium | 1.0M in + 0.5M out | $0.25 | $0.25 |
| 🚀 Heavy | 10.0M in + 5.0M out | $2.50 | $2.54 |
| 🏢 Enterprise | 100.0M in + 50.0M out | $25.00 | $25.36 |
Frequently asked questions about step-3.5-flash
How much does the Step 3.5 Flash API cost?
The lowest input rate is USD 0.1 per 1M tokens; output on that channel is USD 0.3 per 1M tokens.
Which channel has the cheapest Step 3.5 Flash API?
OpenRouter has the lowest input rate: USD 0.1 per 1M tokens. Cross-currency ranking uses exchange rates; compare output and cache prices separately.
What is the Step 3.5 Flash cache-read price?
阶跃星辰 (StepFun): CNY 0.14 per 1M cache-read tokens.
When was Step 3.5 Flash pricing last updated?
Updated on 2026-10-31. This is the latest recorded price update or verification; see the table for individual channel dates.
Is there a free Step 3.5 Flash API?
No available recorded channel lists both input and output at zero. Missing prices, free cache reads or a free chat tier do not establish a free API; check provider terms for trial credits.
How do I calculate Step 3.5 Flash token costs and monthly spend?
Metered API cost = input tokens / 1M × input rate + output tokens / 1M × output rate. At the lowest-input-rate channel, 1M input plus 250K output tokens costs approximately USD 0.175. This excludes caching, tools, retries and other service fees; the lowest input rate does not guarantee the lowest total bill.