Claude Code, Antigravity CLI, and OpenClaw Reshape AI Terminal Agent Landscape in 2026

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Terminal-based AI agents have seen significant shifts in 2026, with Google retiring Gemini CLI for individual users and replacing it with Antigravity CLI, a closed-source successor that has faced pushback from the open-source community. Claude Code has been updated to run on the Opus 4.8 and Fable 5 models, featuring a 1-million-token context window and a new Dynamic Workflows capability. OpenClaw, an open-source always-on agent, has gained widespread traction on GitHub but carries a documented security vulnerability that developers should review before deployment. A detailed comparison covering costs, context windows, open-source status, and setup complexity has been published to help developers evaluate all three tools. The Gemini-to-Antigravity transition is particularly relevant for teams with existing scripts or CI/CD pipelines built around the older CLI.

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