# GPT-5.5

OpenAI's latest frontier reasoning model with enhanced capabilities and 1M context window.

## Overview

- **Provider:** OpenAI
- **Model ID:** `gpt-5.5`
- **Type:** Chat
- **Canonical URL:** https://modelstack.cc/models/chat/gpt-5.5
- **Version:** v5.5
- **Knowledge cutoff:** 2025-12
- **Best for:** Advanced reasoning, complex problem-solving, highest intelligence tasks, extended context

## Pricing

| Usage | Price |
| --- | ---: |
| Input | $5 / 1M tokens |
| Output | $30 / 1M tokens |
| Cache read | $0.5 / 1M tokens |
| Cache write (5 minutes) | $5 / 1M tokens |

## Specifications

- **Context window:** 1.05M
- **Maximum output:** 128K
- **Typical latency:** 20 ms
- **Released:** 2026-04

## Capabilities

- chat
- tool_use
- vision
- coding

## API usage

Use this model ID in a ModelStack API request:

```json
{
  "model": "gpt-5.5"
}
```

For the rendered page, visit https://modelstack.cc/models/chat/gpt-5.5.