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Anthropic

Claude Opus 5.5 API

Successor to Claude Opus 5 for demanding reasoning, coding and long-running agentic work.

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Starting at

$1.8

input price per 1M tokens

4 token price options

Claude Opus 5.5 playground

Input

anthropic
2048
1.0
1.00

Input

$1.8 / 1M

Output

$9 / 1M

Output

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Ask Claude Opus 5.5 anything. Messages are sent directly to the API and charged by token usage.

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Claude Opus 5.5 API pricing

OptionPrice per 1M tokens
input$1.8
output$9
cacheRead$0.09
cacheWrite$2.25

Quick start

Full API reference →
1curl -X POST https://api.api-stock.com/api/v1/messages \
2  -H "Authorization: Bearer $API_STOCK_KEY" \
3  -H "Content-Type: application/json" \
4  -d '{
5    "model": "claude-opus-5-5",
6    "max_tokens": 1024,
7    "messages": [
8      {
9        "role": "user",
10        "content": "A cinematic shot of a city at dusk"
11      }
12    ]
13  }'

Frequently asked questions

How much does Claude Opus 5.5 cost?

Claude Opus 5.5 starts at $1.8 per 1M input tokens through the API Stock API. You pay per use from a single prepaid balance — there is no subscription — and the final price scales with parameters such as resolution or duration.

How do I get an API key for Claude Opus 5.5?

Sign up for API Stock, top up your balance by any amount and create an API key in the dashboard — it takes a couple of minutes and needs no contract. The same key works with every model in the catalog, so there is no separate key to obtain for Claude Opus 5.5.

How do I call the Claude Opus 5.5 API?

Send a POST request to https://api.api-stock.com/api/v1/messages with your API key and the model "claude-opus-5-5", using the anthropic-compatible request format shown in the quick start above.

What happens if a Claude Opus 5.5 request fails?

API Stock automatically retries the request on a reserve provider. If every provider fails, the charge is refunded to your balance.

Can I use Claude Opus 5.5 with the same API key as other models?

Yes. Every model on API Stock — video, image, music and chat — shares one API key and one prepaid balance, so you can switch to Claude Opus 5.5 without new credentials.

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