Best Claude Code alternatives

OpenAI's cloud-based autonomous coding agent, powered by the GPT-5 family, reading a codebase and opening pull requests from written instructions.

Open-source, git-aware AI pair programmer that runs in your terminal. Same project as "Aider Chat" elsewhere in this directory, now maintained at Aider-AI/aider.

Cognition AI's autonomous software engineer that plans, writes, debugs, and ships code with limited human oversight, across several model backends.

Open-source terminal coding agent with a TUI that works with any model provider, including local models, and supports LSP, MCP and custom agents.

Open-source platform for autonomous coding agents built by All Hands AI, running in a sandboxed Docker environment to fix issues and open pull requests.

Open-source AI agent from Block, runnable as a desktop app or CLI, connecting to external systems via MCP and now governed by the Agentic AI Foundation.

Google's open-source terminal coding agent built on Gemini models with a 1M-token context window. Shut down for free consumer accounts June 18, 2026.