Detailed comparison of capabilities, features, and performance.
| Feature | GPT-5.1 codex | Claude 3.5 Haiku |
|---|---|---|
| AI Lab | OpenAI | Anthropic |
| Context Size | 400,000 tokens | 204,800 tokens |
| Max Output Size | 128,000 tokens | 4,096 tokens |
| Frontier Model | Yes | No |
| Vision Support | Yes | No |
| Description | A version of GPT-5.1 optimized for agentic coding tasks. | The latest Haiku 3.5 model from Anthropic |
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