Claude Opus 5.5 vs GPT-6 Astra.
Claude Opus 5.5 is 2.5x cheaper.
For a chatbot doing 100K requests a month with 1,000 input and 500 output tokens each: $1,400.00 vs $3,500.00.
Anthropic
Claude Opus 5.5
| Input / 1M | $4.00 |
| Cached / 1M | $0.20 |
| Output / 1M | $20.00 |
| Context | 1M |
| Chatbot at 100K req/mo | $1,400.00 |
Source · Oct 20, 2026
OpenAI
GPT-6 Astra
| Input / 1M | $10.00 |
| Cached / 1M | $1.00 |
| Output / 1M | $50.00 |
| Context | — |
| Chatbot at 100K req/mo | $3,500.00 |
Source · Oct 20, 2026
Sponsored
Your API or dev tool here. Reach developers comparing model costs right now.Price isn't everything: check quality on your own prompts. Claude Opus 5.5 wins on list price for this workload, but output-heavy jobs (long answers, agents, reasoning) shift the math toward whichever model has the lower output price, which here is Claude Opus 5.5.