First off, Klein has introduced a super handy new feature - a favorite toggle mode. When using either Client or OpenRouter as a provider, you can now click on the star icon next to any model to pin it to the top of your list. This allows you to quickly change and switch between your go-to models in a more intuitive way.

Klein has now introduced a major performance boost when applying diff edits, especially for files with tons of changes. Whether you're iterating on big projects or making bulk updates, the lag is now gone and the speed is up, resulting in snappier responses and smoother workflows all around.

You can now see exactly what edits Klein made during each operation, giving you more control and visibility into the coding process. This overall performance boost for applying diff edits, especially for large files, is a significant improvement.

Additionally, an auto-approve option has been added for edits and reads outside your workspace, saving you time. Improved diff editing animations and an edit count indicator that shows the number of diffs Klein applied to a file are also included in this update.

Klein 4.0 introduces several features that provide more transparency and control over the code changes made by the AI agent:

• Diff Editing Visibility: You can now see exactly what edits Klein made during each operation, giving you more control and visibility into the coding process.
• Performance Boost for Diff Edits: Klein has seen a major performance boost when applying diff edits, especially for files with many changes. This results in snappier responses and smoother workflows.
• Auto Approve for Edits/Reads: An "auto approve" option has been added for edits and reads outside your workspace, saving you time.
• Edit Count Indicator: The edit count indicator will show the exact number of diffs Klein applied to a file.
• Improved Diff Editing Animations: The diff editing animations have been improved for better visual feedback.
• Checkpoint Tracking: Klein has redesigned checkpoints, creating them more frequently and allowing you to easily track progress and rewind if needed.

These features provide developers with greater transparency into Klein's actions and more control over the coding process, leading to more reliable and efficient workflows.

Klein has now integrated new API providers like XAI, which now supports the new GPT-3 models. Additionally, there are new models from providers such as Ask Sage, Olama, Byte Dance Double, Alibaba Quinn, and DeepSeek. This increase in flexibility allows users to utilize various models and API providers within Klein, expanding the capabilities and customization options available.

Klein has now redesigned the checkpoints feature, which creates checkpoints more frequently throughout your tasks. These checkpoints are shown as a line indicator on the left edge of the chat. You can simply hover over them to expand and view details like the exact time they were created. This is a subtle but powerful way to track your progress and easily rewind if needed. The improved checkpoint system provides better visibility into the coding process, allowing you to monitor your progress and quickly navigate back to previous states if required.

Klein has now introduced a local Chrome integration through the extension, allowing users to use their own Chrome browser for session-based browsing within Klein. This integration directly ties your debugging and productivity workflows to your actual browser state, unlocking more accurate context-aware interactions with web tools and apps you're building.

This feature is perfect for real-world development workflows and advanced automation. Klein can now summarize information from logged-in websites and dashboards, using your authenticated browser session, eliminating the need for copy-pasting from private portals. You can now focus on building instead of bouncing between different tabs.

Klein has introduced a new "YOLO mode" that gives full autonomy to the AI coding agent. This mode can be enabled by toggling the "auto approve" setting, which will allow Klein to execute commands without requiring user approval for every action.

This YOLO mode is a powerful feature, but it should be used with caution as it can consume a significant number of tokens if left unattended. Users are advised to carefully monitor and intervene when necessary to avoid unintended consequences.

When enabled, the YOLO mode allows Klein to operate in a fully autonomous manner, making decisions and taking actions on its own without the need for constant user oversight. This can be particularly useful for automating repetitive tasks or for allowing the AI to explore and experiment freely within the codebase.

However, it's important to note that the YOLO mode should be used judiciously, as the AI's actions can have significant impacts on the codebase. Users should be prepared to step in and take control if the AI's actions start to deviate from the intended goals or if any issues arise.

Overall, the YOLO mode is a powerful feature that can streamline and accelerate the coding process, but it should be used with caution and with a clear understanding of its potential risks and limitations.

Klein has introduced several new features that focus on streamlining the development workflow:

• Easy MCP Server Management: You can now easily manage your connected MCPs directly from the chat input with a new quick access mode.
• Drag and Drop Context: You can add files and folders to your context task list by simply dragging and dropping them into the chat window.
• Command + Shortcut: A new shortcut feature that allows you to quickly send selected code or text into the client chat.
• Prompt Caching for LLM and Cloud: Improved caching for faster response times when using language models and cloud services.
• Smarter Context Management: Enhancements to how Klein handles and manages the context of your tasks.
• MCP Autoproof Sync Fix: Fixes have been made to the MCP autoproof sync feature to improve reliability.

These workflow improvements, along with the other updates in the 4.0 release, aim to make Klein an even more seamless and efficient tool for developers to use in their daily work.

The latest updates to Klein 4.0 have brought a range of new features and improvements that streamline the developer workflow. Key highlights include:

• Favorite toggle mode for quickly switching between go-to models
• Significant performance boost for applying diff edits, especially for large files
• Auto-approve option for edits and reads outside the workspace
• Improved diff editing animations and edit count indicators
• Integrated support for new API providers like XAI, Ask Sage, and Byte Dance
• Redesigned checkpoints for easily tracking and rewinding progress
• Local Chrome integration for more accurate context-aware interactions
• Summarization of information from logged-in websites and dashboards
• Smarter file change detection and recommended model configurations
• Faster and more accurate file mention search with improved relevancy scoring
• Various bug fixes and workflow enhancements across the board

These updates demonstrate Klein's continued focus on improving developer productivity, flexibility, and control over the autonomous coding process. The platform's growing ecosystem of API providers and model options further enhances its capabilities to support diverse development needs. Overall, the Klein 4.0 release represents a significant step forward in streamlining the developer experience.