Claude Opus 5.5 is a large language model from Anthropic's 5.5 family, accessible via the reAPI platform. It handles tasks that require looking at many files at once, such as reviewing an entire codebase or summarizing a stack of research papers. Developers and researchers use this model when smaller context windows fail to capture the full scope of their project.
The model processes both text and images, making it useful for analyzing technical diagrams alongside source code. It uses a credit-based system where you pay only for what you generate. By using the reAPI endpoint, you can integrate this model into your own tools without managing separate Anthropic accounts.
Key Features
- 1 million token context window for large document sets
- Support for both text and image inputs
- Adaptive thinking mode for complex reasoning tasks
- API access via a single reAPI endpoint
- Credit-based billing at $0.001 per credit
- Streaming output for long-form content generation
- Input pricing set at $3.20 per 1 million tokens
- Output pricing set at $16.00 per 1 million tokens
How to Use
- Create a reAPI account and go to the API keys section.
- Generate a new API key and add credits to your account balance.
- Configure your application base URL to https://reapi.ai/api/v1.
- Set the model parameter in your API request to claude-opus-5-5.
- Send your prompt and source files to the endpoint.
- Monitor your usage and credit balance in the reAPI dashboard.
Use Cases
- Reviewing a code pull request by providing the changed files and their related tests.
- Drafting a decision brief based on multiple conflicting research proposals.
- Converting a technical incident report into a clear summary for non-technical stakeholders.
- Comparing multiple source documents to find evidence for a specific recommendation.
Pricing
reAPI uses a credit-based system where 1 credit equals $0.001. Input costs $3.20 per million tokens and output costs $16.00 per million tokens. Check the official reAPI website for the latest rates.
FAQ
What is Claude Opus 5.5?
It is the first model in Anthropic's 5.5 family, designed for complex coding and high-level knowledge work.
Is Claude Opus 5.5 free?
No, it is a paid model that uses a credit-based system on the reAPI platform.
What is the context window size?
It supports up to 1 million tokens, allowing you to process very large files or long conversations.
Can it process images?
Yes, the model accepts both text and image inputs for multi-modal analysis.
How is billing calculated?
You pay for completed generations using credits, with separate rates for input and output tokens.
Does it support streaming?
Yes, you can enable streaming for longer tasks to see the output as it is generated.
