Claude Code alternatives: Antigravity, OpenCode and more

This tutorial presents Antigravity IDE, OpenCode, Blackbox AI and Kilo Code as alternatives to Claude Code. The speaker uses cloud models throughout, explicitly stating that none run locally. The setup therefore concerns a cloud coding assistant workflow rather than offline inference on personal hardware.

The walkthrough starts with Antigravity IDE downloads for macOS, Windows and Linux, using Apple Silicon for the demonstration. The speaker recommends starting with Gemini 3.5 Flash, then switching tools when its rate limit runs out. OpenCode runs in the IDE's terminal. Its setup includes installation with a curl command, opening the model selector and creating an OpenCode Zen API key. The speaker describes OpenCode as open source and notes that its promotional free models change.

For Blackbox AI, the tutorial changes Antigravity's extension marketplace URLs, restarts the IDE and installs the extension. A short prompt produces an HTML landing page; the speaker says this demonstration requires no login. Kilo Code follows as another extension, with browser login and authorization.

The proposed workflow keeps several agents available in one project to reduce interruptions. The presenter says model promotions and rate limits vary, with free choices changing over time.