GPT-5.5
Overview
GPT-5.5 is OpenAI’s previous-generation flagship, strong at autonomously completing multi-step tasks: writing and debugging code, researching online, analyzing data, creating documents and spreadsheets, operating software, and switching between tools until the task is done. It accepts text and image input with a 1.05M-token context window.
Key Features
- Previous Flagship: Strong overall capability
- Autonomous Agentic: Plans, uses tools, verifies, and keeps progressing
- Multimodal: Supports text and image input
Best Use Cases
- Multi-Step Autonomous Tasks: Cross-tool long-horizon execution
- Research and Analysis: Online research and data analysis
- Creative Projects: Long-form and content creation
Specifications
| Item | Detail |
|---|---|
| Platform model ID | gpt-5.5 |
| Context window | 1,050,000 tokens |
| Input modalities | Text, image |
| Reasoning / thinking | Supported |
| First released (market) | 2026-04 |
| Live pricing | See the model marketplace |
Capabilities and Limitations
| Capability | Description |
|---|---|
| Reasoning | Strong. Previous-flagship overall capability |
| Multimodal | Supports text and image input |
| Context Window | 1,050,000 tokens |
| Speed | Moderate |
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