Claude Opus 5 vs OpenAI: GPT-5.5
They cost about the same for input tokens: Claude Opus 5 $5.00 per M, OpenAI: GPT-5.5 $5.00 per M. Claude Opus 5 is 1.2× cheaper for output tokens: Claude Opus 5 costs $25.00 per M and OpenAI: GPT-5.5 costs $30.00 per M. About the same: Claude Opus 5 takes up to 1,000,000 tokens of context and OpenAI: GPT-5.5 up to 1,050,000.
| Claude Opus 5 | OpenAI: GPT-5.5 | |
|---|---|---|
| Model id | anthropic/claude-opus-5 | openai/gpt-5.5 |
| Input | $5.00 per M | $5.00 per M |
| Output | $25.00 per M | $30.00 per M |
| Context length | 1,000,000 tokens | 1,050,000 tokens |
| Accepts | file, image, text | file, image, text |
| Produces | text | text |
| Served by | anthropic | openai |
Prices are the providers' list prices per million tokens, as of . Both run on your own provider key through one OpenAI-compatible endpoint, with no fee on the tokens.