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All comparisons · Prices checked 2026-10-01
Claude Sonnet 5.5 vs Claude Opus 5.5: API cost comparison
For a typical chatbot reply, Claude Sonnet 5.5 costs $0.0091 and Claude Opus 5.5 costs $0.018 per request: Claude Sonnet 5.5 is 2.0× cheaper. Claude Sonnet 5.5 is cheaper in every workload below.
API prices
| Claude Sonnet 5.5 | Claude Opus 5.5 | |
|---|---|---|
| Maker | Anthropic | Anthropic |
| Input / 1M tokens | $2 | $4 |
| Output / 1M tokens | $10 | $20 |
| Output vs input price | 5.0× | 5.0× |
| Context window | 1M tokens | 1M tokens |
| Tokens for the same English text | ~130% of GPT's count (estimate) | ~130% of GPT's count (estimate) |
Cost by workload
| Workload (per 1,000 requests) | Claude Sonnet 5.5 | Claude Opus 5.5 | Cheaper |
|---|---|---|---|
| Chatbot reply short question plus some chat history · 1,500 in / 400 out | $9.10 | $18.20 | Claude Sonnet 5.5 2.0× cheaper |
| Document Q&A (RAG) retrieved passages plus a question · 8,000 in / 500 out | $27.30 | $54.60 | Claude Sonnet 5.5 2.0× cheaper |
| Coding agent step large working context, short edit · 25,000 in / 800 out | $75.40 | $151 | Claude Sonnet 5.5 2.0× cheaper |
| Summarize a long report long input, short summary · 20,000 in / 300 out | $55.90 | $112 | Claude Sonnet 5.5 2.0× cheaper |
| Write an article short brief, long draft · 800 in / 2,000 out | $28.08 | $56.16 | Claude Sonnet 5.5 2.0× cheaper |
Claude Sonnet 5.5 is cheaper on both input and output, so it costs less for every kind of request. The gap is 2.0× on input and 2.0× on output.
Monthly cost
| Monthly volume | Claude Sonnet 5.5 | Claude Opus 5.5 |
|---|---|---|
| 10,000 chatbot replies / month | $91.00 | $182 |
| 100,000 chatbot replies / month | $910 | $1,820 |
| 1,000,000 chatbot replies / month | $9,100 | $18,200 |
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Token counts are for English text measured with GPT's tokenizer; each model's own tokenizer difference is applied automatically.
Questions
Which is cheaper, Claude Sonnet 5.5 or Claude Opus 5.5?
For a typical chatbot reply (1,500 input and 400 output tokens), Claude Sonnet 5.5 costs $0.0091 and Claude Opus 5.5 costs $0.018 per request, so Claude Sonnet 5.5 is 2.0× cheaper. Claude Sonnet 5.5 is cheaper in every workload below.
How much do Claude Sonnet 5.5 and Claude Opus 5.5 cost per million tokens?
Claude Sonnet 5.5 costs $2 per 1M input tokens and $10 per 1M output tokens. Claude Opus 5.5 costs $4 input and $20 output. Prices checked 2026-10-01.
Do both models count the same text as the same number of tokens?
No. Each model family has its own tokenizer, so the same text can be a different number of tokens. The costs on this page already include that difference (estimated from GPT's tokenizer).
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Open the token counter →Standard API list prices, short-context tier, no caching or batch discounts. Prices change; check each provider's pricing page before large jobs.