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Claude Sonnet 4

Nelson CLI is powered by Claude Sonnet 4, Anthropic’s most capable model for coding tasks.

Claude Sonnet 4

Fast, intelligent, and excellent at coding. The perfect balance of speed and capability.

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Model Capabilities

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Code Generation

Nelson can write code in virtually any programming language:
  • JavaScript / TypeScript
  • Python
  • Go
  • Rust
  • Java
  • C / C++
  • Ruby
  • PHP
  • And many more…

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Code Understanding

Nelson can read and understand existing codebases: 
You: Read src/api/auth.js and explain the authentication flow

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Debugging

Nelson excels at finding and fixing bugs: 
You: The tests are failing. Can you investigate and fix the issues?

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Architecture

Nelson can help design and implement software architecture: 
You: Help me design a microservices architecture for an e-commerce platform

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Model Information

PropertyValue
ModelClaude Sonnet 4
Context Window200K tokens
StrengthsCoding, analysis, tool use
Response SpeedFast

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Best Practices

The more specific your request, the better Nelson’s response. Include details about language, framework, and requirements.
If you’re working on an existing project, let Nelson read relevant files first to understand the codebase.
Don’t expect perfection on the first try. Work with Nelson iteratively to refine the output.
For complex tasks, use Nelson Loop to let the AI iterate automatically until completion.