Step 3.5 Flash
The cheapest provider for Step 3.5 Flash is SiliconFlow at $0.15 per 1M tokens (blended), charging $0.10 per 1M input and $0.30 per 1M output tokens. It is served by a single provider. Context window: 256K tokens. Prices tracked since Oct 3, 2026.
Best price
$0.15
at SiliconFlow
Input / output
$0.10 / $0.30
per 1M tokens
Providers
1
no spread
7 days
—
best price
30 days
—
best price
Context
256K
tokens
Providers
Active offers ranked by blended price. Bars are relative to the most expensive.
| Provider | Input | Output | Blended | vs cheapest | Context | Uptime 1d | Price since |
|---|---|---|---|---|---|---|---|
SiliconFlowCheapest fp8 | $0.10 | $0.30 | $0.15 | best |
- SiliconFlowCheapest$0.15$0.10 in · $0.30 outbest256K ctx99.1% uptimefp8
Blended = (3 × input + output) / 4.
Price history
Hover to compare providers at any point in time. Click a legend item to hide it.
USD per 1M tokens · each step is a price change
Not enough history yet
Tracking since Oct 3, 2026. The chart fills in as new crawls arrive every 6 hours.
Change log
Every recorded change for this model since Oct 3, 2026.
No changes yet
Tracking since Oct 3, 2026. Price changes, new providers and delistings will show up here.
About this model
Step 3.5 Flash is StepFun's most capable open-source foundation model. Built on a sparse Mixture of Experts (MoE) architecture, it selectively activates only 11B of its 196B parameters per token....
- Released
- Jan 29, 2026
- First tracked
- Oct 3, 2026
- Canonical slug
- stepfun/step-3.5-flash
- Weights
- stepfun-ai/Step-3.5-Flash