# Step 3.5 Flash API Pricing

As of November 7, 2026, Step 3.5 Flash costs $0.10 per 1M input tokens and $0.30 per 1M output tokens on EmpirioLabs AI, with cache reads at $0.02 per 1M tokens. It has a 262,144-token context window and returns up to 131,072 tokens per response.

- Page: https://models.litellm.ai/models/step-3-5-flash
- LiteLLM model name: `empiriolabs/step-3-5-flash`
- Context window: 262,144 tokens
- Max output: 131,072 tokens
- Added to LiteLLM: September 18, 2026
- Prices updated: November 4, 2026

## Pricing by provider

Token prices in USD per 1M tokens.

| Provider | Model name | Input | Output | Cache read | Per image | Per second | Context |
|---|---|---|---|---|---|---|---|
| EmpirioLabs AI | `empiriolabs/step-3-5-flash` | $0.10 | $0.30 | $0.02 | – | – | 256K |

## Cost examples

1,000 requests with 2,000 input and 500 output tokens each:

- EmpirioLabs AI: $0.35

100 long-document requests with 100,000 input and 2,000 output tokens each:

- EmpirioLabs AI: $1.06

## Features

Supported: Function calling, Reasoning, Prompt caching, Web search.

## Use it with LiteLLM

```python
from litellm import completion

response = completion(
    model="empiriolabs/step-3-5-flash",
    messages=[{"role": "user", "content": "Hello!"}],
)
```

## Cost calculator

10,000 requests a day with 1,000 input and 500 output tokens each, at EmpirioLabs AI's price: $0.00025 per request, $2.50 per day, $75.00 per month (30 days). Try other numbers at https://models.litellm.ai/calculator?model=step-3-5-flash

## FAQ

### How much does Step 3.5 Flash cost?

Step 3.5 Flash costs $0.10 per 1M input tokens and $0.30 per 1M output tokens on EmpirioLabs AI, with cache reads at $0.02 per 1M tokens.

### What is the context window of Step 3.5 Flash?

Step 3.5 Flash has a 262,144-token context window and returns up to 131,072 tokens per response.

### Which providers offer Step 3.5 Flash?

Step 3.5 Flash is available from EmpirioLabs AI through LiteLLM, using the model name empiriolabs/step-3-5-flash.

### How do I call Step 3.5 Flash with an OpenAI-compatible API?

Use the LiteLLM Python SDK with model="empiriolabs/step-3-5-flash", or add the model to the LiteLLM proxy's config.yaml and send requests to /v1/chat/completions from any OpenAI client. LiteLLM tracks the cost of every request at the prices on this page.

### What features does Step 3.5 Flash support?

Step 3.5 Flash supports function calling, reasoning, prompt caching and web search.

### When did LiteLLM add Step 3.5 Flash?

Step 3.5 Flash was added to LiteLLM's model price file on September 18, 2026.

Source: LiteLLM model price file, https://github.com/BerriAI/litellm/blob/main/model_prices_and_context_window.json. Maintainers update it from each provider's published pricing, and this page is usually rebuilt within 20 minutes of every change.