Start Gemini CLI with the flagship Gemini 3.1 Pro model
gemini-3.1-pro-preview is the current flagship as of April 2026 (released Feb 19, 2026). It supports Deep Think extended reasoning, Computer Use (autonomous UI interaction), MCP tool calling, and a massive context window. Use for complex multi-step reasoning and agent tasks. Replaces the deprecated gemini-3-pro-preview (shut down March 9, 2026).
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