Claude Code updates: When to use Haiku 4.5, Claude Code on web, and more.

Key Concepts

• Claude Code on the Web: A cloud-based platform for delegating coding tasks directly from a browser or mobile app.
• GitHub Integration: Connects to GitHub accounts to access and modify repositories.
• Isolated Sandbox: Claude Code runs tasks in a secure, isolated environment with full Git access.
• Parallel Task Execution: Ability to run multiple coding tasks simultaneously across different repositories.
• Claude Haiku 4.5: A new, highly performant and cost-effective coding model.
• Claude Sonnet 4.5: A previously launched, state-of-the-art coding model.
• Multi-Agent Approach: Utilizing different Claude models (e.g., Sonnet for planning, Haiku for implementation) for complex tasks.
• Open in CLI Button: A feature that allows seamless transfer of code changes from the web interface to a local terminal.
• Follow-up Questions: Claude Code's ability to ask clarifying questions to ensure accurate implementation of coding requests.

Claude Code on the Web: Cloud-Based Development

Claude Code is now accessible via the web, enabling users to delegate coding tasks directly from their browser or the cloud mobile app, eliminating the need to open a terminal or IDE for every change.

Functionality and Workflow

1. GitHub Connection: Users connect their GitHub account.
2. Repository Selection: A specific repository is chosen for the task.
3. Prompting: A description of the required coding task is provided. For example, a prompt could be: "Add input validation to the user registration endpoint. Also make sure we're using a strong password on both the front end and backend API."
4. Execution: Claude Code runs the task in an isolated sandbox with full Git access.
5. Real-time Progress Monitoring: Users can observe the progress of the task as it unfolds.

Key Features

• Parallel Task Execution: The platform supports running multiple tasks concurrently across different repositories. This is beneficial for managing bug backlogs, performing routine fixes, or implementing new features simultaneously.
• "Open in CLI" Button: A significant feature that allows users to seamlessly transfer code changes from the web interface to their local development environment. Clicking this button provides a command to paste into the terminal, preserving all context and progress from the web session. This enables continuation of work on a local machine, mobile phone, or browser.
• Smarter Local Workflows with Multi-Question Support: Claude Code can engage in a dialogue with the user by asking follow-up questions to gather necessary details for accurate implementation. For instance, when asked to add caching, Claude Code might inquire about:
  • Caching Level: Database query caching, API response caching.
  • Goals: Improve performance, reduce database load.
  • Target Area: Workout data, user data, analytics.
  • Technology: Redis, in-memory, PostgreSQL. Once these details are provided, Claude Code can proceed with the implementation.

Claude Haiku 4.5 and Sonnet 4.5: Advanced Coding Models

The video highlights the recent advancements in Claude's coding models, specifically Claude Haiku 4.5 and Claude Sonnet 4.5.

Performance and Cost-Effectiveness

• Claude Sonnet 4.5: Launched a few weeks prior, it was recognized as the world's best coding model at the time.
• Claude Haiku 4.5: Launched the week before the video, it offers comparable coding performance to Sonnet 4 at a significantly lower cost and higher speed.
  • Cost: One-third the cost of Sonnet 4.
  • Speed: More than twice the speed of Sonnet 4.
  • Performance: Surpasses Sonnet 4 in certain tasks, such as computer vision.

Benchmarks for Haiku 4.5

• Sweetbench Verified: 73.3%
• Terminal Bench: 41%
• Agentic Coding Evaluations: Achieves 90% of Sonnet 4.5's performance.

Recommended Usage Patterns

The community has observed a pattern where:

• Claude Sonnet 4.5 is used for high-level problem decomposition and planning.
• Claude Haiku 4.5 is then employed for the actual implementation and code writing.

This multi-agent approach is proving effective for tasks like large-scale refactors and addressing technical debt.

Availability and Pricing

• Claude Haiku 4.5 is available wherever Claude is accessed.
• Pricing: $1 per million input tokens and $5 per million output tokens.

Conclusion and Call to Action

Claude Code on the web provides a platform for parallel, cloud-based development, accessible from anywhere. Coupled with the speed and cost-efficiency of Claude Haiku 4.5 and the intelligent workflow support of features like multi-question prompts, it aims to enhance developer productivity.

Claude Code on the web is currently available for Pro and Max users at cloud.ai/code. Users are encouraged to try it and provide feedback.