Best GitHub Copilot alternatives

Anthropic's agentic coding tool, running in the terminal, IDE, desktop app, and browser, reading your codebase and editing files with explicit approval.

Open-source VS Code extension that turns the editor into an autonomous coding agent, using your own API key and an approval gate before each action.

AI-first code editor forked from VS Code, with Tab autocomplete, multi-file Agent mode, Composer, and background agents running on Claude, GPT, or Gemini.

Cognition AI's agentic IDE (formerly Codeium), built on VS Code, with the Cascade agent handling codebase-wide reasoning and multi-file edits.

Open-source AI coding assistant for VS Code and JetBrains, routing between model providers through one config file, with custom context and Agent mode.

Open-source agentic coding platform with five agent modes, support for 500+ models at no markup, an MCP marketplace, and parallel subagents.