# GPT-5.3 Instant API Pricing

GPT-5.3 Instant is available through LiteLLM. It has a 128,000-token context window and returns up to 64,000 tokens per response.

- Page: https://models.litellm.ai/models/gpt-5.3-instant
- Lab: OpenAI
- Context window: 128,000 tokens
- Max output: 64,000 tokens
- Added to LiteLLM: March 2026
- Prices updated: October 10, 2026

## Pricing by provider

Token prices in USD per 1M tokens.

| Provider | Model name | Input | Output | Cache read | Per image | Per second | Context |
|---|---|---|---|---|---|---|---|
| ChatGPT Subscription | `chatgpt/gpt-5.3-instant` | – | – | – | – | – | 128K |

## Features

Supported: Function calling, Parallel tool calls, Structured output, Image input.

## FAQ

### What is the context window of GPT-5.3 Instant?

GPT-5.3 Instant has a 128,000-token context window and returns up to 64,000 tokens per response.

### What features does GPT-5.3 Instant support?

GPT-5.3 Instant supports function calling, parallel tool calls, structured output and image input.

### When did LiteLLM add GPT-5.3 Instant?

GPT-5.3 Instant was added to LiteLLM's model price file in March 2026.

Source: LiteLLM model price file, https://github.com/BerriAI/litellm/blob/main/model_prices_and_context_window.json