Claude Sonnet 5.5
Claude Sonnet 5.5 is an AI model developed by Anthropic designed for everyday professional tasks. It supports text, image, and file inputs, and features advanced reasoning capabilities for complex problem-solving.
Claude Sonnet 5.5 specs and pricing
- Provider: Anthropic
- Released: September 28, 2026
- Context window: 1M tokens
- Max output: 128K tokens
- Input: text, images, files
- Output: text
- Price: $2.00 input / $10 output per 1M tokens
- Reasoning: yes
- Tool calling: yes
What Claude Sonnet 5.5 is good at
- Developing software features
- Debugging code
- Analyzing large documents and images
To-dos to try with Claude Sonnet 5.5
- Upload a codebase and ask the model to identify and fix a specific bug.
- Upload a technical manual and ask for a summary of the maintenance procedures.
- Provide a screenshot of a user interface and ask for the corresponding code to replicate it.
FAQ
- Who developed Claude Sonnet 5.5? This model is developed by Anthropic.
- Can this model process images? Yes, Claude Sonnet 5.5 accepts both text and image inputs.
- How much does Claude Sonnet 5.5 cost? Claude Sonnet 5.5 costs $2.00 per million input tokens and $10 per million output tokens through OpenRouter. In todo.is a typical agent step costs about 7 credits ($1 = 100 credits).
- What is the context window of Claude Sonnet 5.5? Claude Sonnet 5.5 can read up to 1M tokens at once and write up to 128K tokens in one reply.
- Can I use Claude Sonnet 5.5 without coding? Yes. In todo.is you pick Claude Sonnet 5.5 as your agent's model and write to-dos in plain words, on the web, the Android app, WhatsApp or Telegram. No API key needed: credits are included, or you can bring your own key.
JavaScript is required to use the todo.is app.