Claude Opus 5.5 vs Claude Sonnet 5.5: cost
For a typical support chatbot, Claude Sonnet 5.5 is about 2.0× cheaper than Claude Opus 5.5 ($140 vs $274 per month). Price is only one factor: test both on your own prompts before switching.
| Claude Opus 5.5 | Claude Sonnet 5.5 | |
|---|---|---|
| Input /1M | $4.00 | $2.00 |
| Output /1M | $20.00 | $10.00 |
| Cached input /1M | $0.20 | $0.20 |
| Batch input /1M | $2.00 | $1.00 |
| Batch output /1M | $10.00 | $5.00 |
| Context | 1,000,000 | 1,000,000 |
Monthly cost by workload
| Scenario (per month) | Claude Opus 5.5 | Claude Sonnet 5.5 |
|---|---|---|
| Customer support chatbot 1,000 req/day · 1,500 in · 300 out | $274 | $140 |
| RAG over documents 500 req/day · 6,000 in · 400 out | $377 | $191 |
| Agent loop (10 calls/task, 200 tasks) 2,000 req/day · 8,000 in · 500 out | $1,243 | $655 |
| Batch summarization 10,000 req/day · 3,000 in · 200 out · batch | $2,400 | $1,200 |