Detailed comparison of capabilities, features, and performance.
| Feature | GPT-5.1 codex | Claude 4.5 Opus |
|---|---|---|
| AI Lab | OpenAI | Anthropic |
| Context Size | 400,000 tokens | 200,000 tokens |
| Max Output Size | 128,000 tokens | 64,000 tokens |
| Frontier Model | Yes | Yes |
| Vision Support | Yes | Yes |
| Description | A version of GPT-5.1 optimized for agentic coding tasks. | The latest Opus 4.5 model from Anthropic |
View detailed specifications and capabilities
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View model details →Access both GPT-5.1 codex and Claude 4.5 Opus in a single workspace without managing multiple API keys.
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