Key highlights for week of 12/15/2025 - v0.21.0

[NTaylorMullen]

Here is Gemini CLI’s December 15th weekly update for v0.21.0

• ⚡️⚡️⚡️ Gemini 3 Flash + Gemini CLI: Better, faster and cheaper than 2.5 Pro and in some scenarios better than 3 Pro! For paid tiers + free tier users who were on the wait list enable "Preview Features" in /settings. Our goal is to expand availability in the coming weeks. Looking forward to sharing its awesomeness with everyone!
• feat: launch Gemini 3 Flash in Gemini CLI ⚡️⚡️⚡️ #15196
• Blog: https://developers.googleblog.com/gemini-3-flash-is-now-available-in-gemini-cli/
• 🎉 Gemini CLI Extensions:
  • Rill: Utilize natural language to analyze Rill data, enabling the exploration of metrics and trends without the need for manual queries.
    gemini extensions install https://github.​com/rilldata/rill-gemini-extension
  • Browserbase: Interact with web pages, take screenshots, extract information, and perform automated actions with atomic precision.
    gemini extensions install https://github.com/browserbase/mcp-server-browserbase
• Quota Visibility: The /stats command now displays quota information for all available models, including those not used in the current session. (pic, pr by @sehoon38)
• Fuzzy Setting Search: Users can now quickly find settings using fuzzy search within the settings dialog. (pr by @sehoon38)
• MCP Resource Support: Users can now discover, view, and search through resources using the @ command. (pr by @MrLesk)
• Auto-execute Simple Slash Commands: Simple slash commands are now executed immediately on enter. (pr1, pr2, pr3 by @jackwotherspoon)
• Small features, Polish, Reliability & Bug Fixes: A large amount of changes, smaller features, UI updates, reliability and bug fixes + general polish made it in this week!