Claude Sonnet 4.6
Claude Sonnet 4.6 is an AI model developed by Anthropic designed for professional tasks, coding, and agentic workflows. It supports a large context window of one million tokens and can process both text and image inputs to assist with complex projects.
Claude Sonnet 4.6 specs and pricing
- Provider: Anthropic
- Released: February 17, 2026
- Context window: 1M tokens
- Max output: 128K tokens
- Input: text, images, files
- Output: text
- Price: $3.00 input / $15 output per 1M tokens
- Reasoning: yes
- Tool calling: yes
What Claude Sonnet 4.6 is good at
- Navigating and modifying complex codebases
- Managing end-to-end professional projects
- Reasoning through multi-step tasks using tool calling
To-dos to try with Claude Sonnet 4.6
- Analyze this 500-page technical manual and summarize the safety protocols.
- Review this entire software repository and suggest refactoring for the authentication module.
- Process these project requirement documents and generate a step-by-step implementation plan.
FAQ
- What types of input can Claude Sonnet 4.6 process? The model accepts text, images, and files as input.
- What is the primary focus of this model? It is built for high-level performance in coding, professional work, and supporting AI agents.
- How much does Claude Sonnet 4.6 cost? Claude Sonnet 4.6 costs $3.00 per million input tokens and $15 per million output tokens through OpenRouter. In todo.is a typical agent step costs about 10.5 credits ($1 = 100 credits).
- What is the context window of Claude Sonnet 4.6? Claude Sonnet 4.6 can read up to 1M tokens at once and write up to 128K tokens in one reply.
- Can I use Claude Sonnet 4.6 without coding? Yes. In todo.is you pick Claude Sonnet 4.6 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.