Head to head
Claude Mythos 5 vs GPT-5.5
On a blended workload of one million input tokens and three million output tokens, GPT-5.5 is 1.7× cheaper than Claude Mythos 5.
| Claude Mythos 5 | GPT-5.5 | |
|---|---|---|
| Provider | Anthropic | OpenAI |
| Input / MTok | $10 | $5 |
| Output / MTok | $50 | $30 |
| Cache read / MTok | $1 | $0.5 |
| Context window | 1,000,000 | — |
| Blended 1M in + 3M out | $160.00 | $95.00 |
| Status | preview | ga |