Claude Opus 5.5 vs Claude Sonnet 5.5: API cost comparison
For a typical chatbot (1,500 input + 400 output tokens, 100,000 requests a month), Claude Sonnet 5.5 is 50% cheaper: $829 vs $1,658 for Claude Opus 5.5. Paste your own prompt below to compare the exact cost of your workload.
0 characters0 words0 tokens (GPT o200k)
| Model | Per month |
|---|---|
| Claude Opus 5.5 | |
| Claude Sonnet 5.5 |
≈ = estimated token count: only OpenAI publishes its tokenizer. Claude counts use Anthropic’s published ratios; use the count_tokens API for an exact number.
Price per million tokens
USD, standard tier. Prices checked on October 28, 2026.
| Claude Opus 5.5 | Claude Sonnet 5.5 | |
|---|---|---|
| Input | $4 | $2 |
| Output | $20 | $10 |
| Cached input | $0.2 | $0.1 |
| Cache write (5 min) | $5 | $2.5 |
| Long prompts | Same price at any length | Same price at any length |
| Batch API | 50% off | 50% off |
| Provider | Anthropic (Claude) | Anthropic (Claude) |
Monthly cost for common workloads
| Workload | Claude Opus 5.5 | Claude Sonnet 5.5 |
|---|---|---|
| Chatbot 1,500 input + 400 output tokens, 100,000 requests a month | $1,658 | $829 |
| Document Q&A (RAG) 8,000 input + 500 output tokens, half the input cached, 20,000 requests a month | $680 | $340 |
| Long-document summary 150,000 input + 2,000 output tokens, 1,000 requests a month | $898 | $449 |
| Bulk classification (Batch API) 500 input + 20 output tokens, 1 million requests a month, Batch API where available | $1,630 | $815 |
Token counts are converted per model: the same text becomes a different number of tokens on each provider (see below). The cheaper option in each row is highlighted.
Frequently asked questions
Is Claude Opus 5.5 cheaper than Claude Sonnet 5.5?
Per million tokens, Claude Opus 5.5 costs $4 / $20 (input / output) and Claude Sonnet 5.5 costs $2 / $10. For a typical chatbot workload (1,500 input + 400 output tokens, 100,000 requests a month), Claude Sonnet 5.5 is 50% cheaper: $829 vs $1,658 for Claude Opus 5.5. Token counts differ between providers, so compare the cost of the same prompt rather than the price per token.
How much do Claude Opus 5.5 and Claude Sonnet 5.5 cost per million tokens?
Claude Opus 5.5: $4 / $20 for input / output, $0.2 for cached input. Claude Sonnet 5.5: $2 / $10, $0.1 for cached input. Prices in US dollars, standard tier, checked on October 28, 2026.
Do Claude Opus 5.5 and Claude Sonnet 5.5 count tokens the same way?
Claude Opus 5.5 uses Anthropic's newer tokenizer, which produces about 30% more tokens than earlier Claude models. We estimate about 1.43× the GPT o200k count for the same text. Claude Sonnet 5.5 uses Anthropic's newer tokenizer, which produces about 30% more tokens than earlier Claude models. We estimate about 1.43× the GPT o200k count for the same text.
Do Claude Opus 5.5 and Claude Sonnet 5.5 have a Batch API discount?
Both do: Claude Opus 5.5 gets 50% off and Claude Sonnet 5.5 50% off for requests sent through the Batch API, which may take up to 24 hours.
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