Step 3.5 Flash 2603
Updated Sep 11, 2026
262k context256k max outputreleased Apr 2, 2026Open weightsReasoningTool calling
Official
—
output per 1M tokens
Providers
6
offering this model
Spread
1.0×
max / min output
Offers
Metered per-token prices. Cheapest input and output are highlighted; † marks a context-tier surcharge.
| Provider | 1M input | 1M output | 1M cache read | 1M cache write | Context |
|---|---|---|---|---|---|
| EmpirioLabs AIopen | Cheapest$0.1 | Cheapest$0.3 | $0.02 | — | 256k |
| NanoGPTopen | $0.1 | $0.3 | $0.05 | — | 262k |
| StepFun (China)open | $0.1 | $0.3 | $0.02 | — | 256k |
| StepFun (Global)open | $0.1 | $0.3 | $0.02 | — | 256k |
Subscription plans (not per-token)
Billed per month, not per token — never counted as the cheapest offer.
| Provider | 1M input | 1M output | Context |
|---|---|---|---|
| StepFun Step Plan (China)plan | — | — | 256k |
| StepFun Step Plan (Global)plan | — | — | 256k |