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Claude Sonnet 4.5: The Best Coding Model for Agents and Computer Use

3 min read

Introduction

Code powers everything from web apps to spreadsheets, enabling modern knowledge work and complex workflows. Claude Sonnet 4.5 enables developers and PMs to solve harder problems, use computers more effectively, and create sophisticated agents faster.

Major Product Upgrades

Claude Sonnet 4.5 ships alongside significant enhancements to Anthropic’s suite.

Claude Code Enhancements

  • Checkpoints: Save progress and roll back instantly.
  • Refreshed UI: Cleaner terminal interface.
  • Native VS Code Extension: Direct integration for faster iteration.

Claude API Improvements

  • Context Editing: Modify agent context mid-run.
  • Memory Tool: Run longer and handle greater complexity.

Claude App Features

  • Code Execution in Chat: Execute Python, Node.js, and more.
  • File Creation: Auto-generate spreadsheets, documents, and slide decks.

Chrome Extension Release

  • Claude for Chrome: Now available to Max users from the waitlist.
  • In-Browser Workflows: Navigate sites, edit spreadsheets, automate tasks.

Alignment and Model Performance

Claude Sonnet 4.5 is the most aligned frontier model Anthropic has released.

SWE-bench Verified Results

  • State-of-the-Art: Leads real-world coding tasks.
  • Focus Endurance: Handles 30+ hours of multi-step programming tasks efficiently.

OSWorld Benchmark Gains

  • Score Increase: 61.4% vs 42.2% just four months ago.
  • Real Computer Use: Automates complex desktop and web tasks.

Reasoning and Math Improvements

  • Outperforms prior models in mathematical proofs and complex logic chains.
  • More consistent multi-step reasoning results across benchmarks.

Domain Expertise Advancements

Experts across:

  • Finance
  • Law
  • Medicine
  • STEM fields report substantial improvements over Claude Opus 4.1:
  • Accurate domain-specific responses.
  • Context-sensitive legal logic.
  • Extended medical reasoning for case study analysis.

Pricing and Availability

  • API Name: claude-sonnet-4-5
  • Pricing: $3 per million input tokens, $15 per million output tokens.
  • Available globally via Claude API today.

Practical Applications for Developers and PMs

For developers:

  • Build agents that use actual desktop workflows.
  • Create stateful assistants for persistent projects.
  • Implement advanced code review bots.

For PMs:

  • Prototype complex product logic quickly.
  • Automate market data analysis.
  • Use in live collaboration for task assignments and tracking.

Conclusion

Claude Sonnet 4.5 is not just another model release. It reshapes what developers and product managers can achieve with AI:

  • Unmatched performance on coding and computer-use benchmarks.
  • Tools for building persistent and capable agents.
  • Accessible via the Claude API at no extra cost.

Start leveraging Claude Sonnet 4.5 today to build the future of AI-assisted work.