Comparison · Anthropic
Claude Opus 5.5 vs Claude Sonnet 5.5
Listed API prices of Claude Opus 5.5 and Claude Sonnet 5.5 turned into the cost of the same three standard tasks, with speed from our own test requests in the United States. Output quality and answer length are not compared.
Calculated impact cost per task and per month
For an L2 task (deep analysis over a 50,000-token document, 3 steps), Claude Opus 5.5 costs $0.696 and Claude Sonnet 5.5 $0.348 at the prices listed in the United States on , so Claude Opus 5.5 is 100.0 % more than Claude Sonnet 5.5, counting visible output only, without cache discounts or hidden reasoning.
| Task | Claude Opus 5.5, per task | Claude Sonnet 5.5, per task | Claude Opus 5.5, per month | Claude Sonnet 5.5, per month | Claude Opus 5.5 vs Claude Sonnet 5.5, per task |
|---|---|---|---|---|---|
| L1Micro-task (classification or strict JSON extraction) | $0.010per L1 task | $0.0050per L1 task | $146.00per month | $73.00per month | +100.0 % |
| L2Deep analysis over a 50,000-token document | $0.696per L2 task | $0.348per L2 task | $10,161.60per month | $5,080.80per month | +100.0 % |
| L3Agentic coding loop, 15 steps | $5.44per L3 task | $2.72per L3 task | $79,453.20per month | $39,726.60per month | +100.0 % |
Calculated Per month: 20 tasks an hour around the clock, 730 hours.
Prices USD per 1M tokens
| Price | Claude Opus 5.5 | Claude Sonnet 5.5 |
|---|---|---|
| Input, per 1M tokens | $4.00 | $2.00 |
| Output, per 1M tokens | $20.00 | $10.00 |
| Price from | Provider's price list · source page Published | Provider's price list · source page Published |
| Read | · the United States | · the United States |
| Context window | 1,000,000 tokens | 1,000,000 tokens |
What can I use it for? six common tasks, our data checks
Quality on your task: not measured by Measured Lab yet.
| Task | Claude Opus 5.5 | Claude Sonnet 5.5 |
|---|---|---|
| Answer customer messages | Fits on price and context | Fits on price and context |
| Pull data from invoices and documents with strict JSON and page images | Fits on price and context | Fits on price and context |
| Summarize documents and meetings | Fits on price and context | Fits on price and context |
| Translate content | Fits on price and context | Fits on price and context |
| Chat assistant on your website | Fits on price and context | Fits on price and context |
| Write and review code with tool calls | Fits on price and context | Fits on price and context |
| Tasks it fits | 6 of 6 | 6 of 6 |
Checks of our data for six common tasks: a published price, a context window and answer length for the task and, where the task needs them, strict JSON output, page images and tool calls; prices, cost a month and terms for each model on its model card. Compare models for your own task in the model picker.
Speed in the US Observed our test requests
In our test requests from the United States, the median time to the first answer token was 3,129 ms for Claude Opus 5.5 (Direct API · Anthropic) and 961 ms for Claude Sonnet 5.5 (Direct API · Anthropic).
| Model and route | Time to first answer token, median | Output speed, median | Answers |
|---|---|---|---|
| Claude Opus 5.5Direct API · Anthropic | 3,129 ms range 689 ms–4,982 ms | 154 tokens/s range 101 tokens/s–229 tokens/s | 115 answers on 23 dates |
| Claude Sonnet 5.5Direct API · Anthropic | 961 ms range 363 ms–8,537 ms | 115 tokens/s range 67.7 tokens/s–244 tokens/s | 115 answers on 23 dates |
The same short request to every model, sent from a measurement point in the United States; medians of successful answers on at least 2 different dates, latest on . How we measure