Surfaces
A surface is how a large language model may be accessed for inference at a given time, distinguished by independent lifecycle clocks. For example, GPT-4.5’s surfaces include the OpenAI API and ChatGPT, whose access was retired in 2025 and 2026 respectively.
| Display name | Type | Developer / provider organization |
|---|---|---|
| Anthropic | API | Anthropic |
| Arcee Platform | API | Arcee |
| AWS Bedrock | API | Amazon |
| ChatGPT | App | OpenAI |
| Claude Code | App | Anthropic |
| Claude.ai | App | Anthropic |
| Gemini API | API | |
| Google Cloud | API | |
| Microsoft Copilot | App | Microsoft |
| Microsoft Foundry | API | Microsoft |
| OpenAI | API | OpenAI |
| OpenRouter | API | OpenRouter |
| Vercel AI Gateway | API | Vercel |
| xAI API | API | xAI |