New Open Source AI Releases — April 2026

Published on

Early April — this page will be updated throughout the month as releases ship.

Cline v3.5 — Multi-File Editing

github.com/cline/cline | Apache-2.0

Cline v3.5 improves multi-file editing with a new diff preview that shows all pending changes across files before you approve. Previously, each file edit was approved individually. The batch approval workflow reduces friction for larger refactors.

Continue — First Stable CI Release

docs.continue.dev | Apache-2.0

Continue shipped v1.0 of its CI tool after pivoting away from IDE-first development. The tool runs AI-powered code review checks in your CI pipeline — think linting but with LLM-based semantic analysis. Early reports suggest it catches logic issues that traditional linters miss, but adds 30-60 seconds to pipeline runs.

Stagewise — Expanded IDE Bridge

stagewise.io | AGPL-3.0

Stagewise added Windsurf and Roo Code to its IDE agent bridge, joining Cursor and Copilot. The bridge lets you click elements in the browser toolbar and route the edit through your preferred IDE agent. The broader bridge support makes it a more viable option for teams that aren’t on Cursor.


For a detailed comparison of all major open-source AI coding tools, see our full comparison guide.

Frequently Asked Questions

What open source AI projects were released in April 2026? +

April 2026 is still early, but notable releases so far include Cline v3.5 with improved multi-file editing workflows, Continue shipping its first stable CI-focused release after the pivot from IDE extension, and Stagewise expanding its IDE agent bridge to support Windsurf and Roo Code alongside Cursor and Copilot.

What are the newest open source AI tools in April 2026? +

The biggest theme in early April 2026 is tool convergence — established projects are adding features that overlap with competitors. Cline is borrowing multi-mode ideas from Roo Code, Continue is moving fully into CI/CD territory, and browser-based tools like Stagewise and Frontman are expanding framework coverage.