Claude Opus 4.5 vs gpt-5-nano
| Anthropic Claude Claude Opus 4.5 | OpenAI gpt-5-nano | |
|---|---|---|
| Vendor | Anthropic Claude | OpenAI |
| Context window | 200,000 | 400,000 |
| Max output | 64,000 | 128,000 |
| Reasoning | Yes | Yes |
| Tool calling | Yes | Yes |
| File input | Yes | Yes |
| Input | text, image, file | text, image |
| Output | text | text |
| Released | 2025-11-24 | 2025-08-07 |