# Step 3.5 Flash 2603 API pricing

The official API price of Step 3.5 Flash 2603 is $0.10461 per 1M input tokens and $0.31384 per 1M output tokens (as of 2026-11-12). Context window: 256K tokens, up to 256K output tokens per request. 6 providers sell it. The lowest is EmpirioLabs AI: $0.1 input, $0.3 output.

- Type: Text
- Context: 256K
- Max output: 256K
- Released: 2026-04-02
- Open weights: Yes

## Price by provider (USD per 1M tokens)

| Provider | Model id | Input | Output | Cached | Notes |
| --- | --- | --- | --- | --- | --- |
| [StepFun (China)](https://platform.stepfun.com/docs/zh/overview/concept) | step-3.5-flash-2603 | $0.10461 | $0.31384 | $0.02092 | Official |
| [EmpirioLabs AI](https://docs.empiriolabs.ai) | step-3-5-flash-2603 | $0.1 | $0.3 | $0.02 | Lowest |
| [NanoGPT](https://docs.nano-gpt.com) | stepfun-ai/step-3.5-flash-2603 | $0.1 | $0.3 | $0.05 |  |
| [StepFun (Global)](https://platform.stepfun.ai/docs/en/overview/concept) | step-3.5-flash-2603 | $0.1 | $0.3 | $0.02 |  |
| [StepFun Step Plan (Global)](https://platform.stepfun.ai/docs/en/step-plan/integrations/reasoning-api) | step-3.5-flash-2603 | — | — | — |  |
| [StepFun Step Plan (China)](https://platform.stepfun.com/docs/zh/step-plan/integrations/reasoning-api) | step-3.5-flash-2603 | — | — | — |  |

Providers are those listed by models.dev. This site has not vetted them one by one; each provider's own page has the binding price.

Prices and specs come from models.dev (MIT licence), updated 2026-11-12. Each provider's name links to its official docs. A provider priced at 0 usually includes the model in a subscription; it is not necessarily a free API.

https://apibook.ai/models/stepfun/step-3.5-flash-2603/