2026-05-20 Google I/O 2026 - Gemini 3.5, Antigravity, and the Agent Bet

Canonical version: 2026-05-20 Google I/O 2026 - Gemini 3.5, Antigravity, and the Agent Bet.

Google I/O 2026 took place yesterday. Google announced new models, a reworked developer platform, and agents across its products. Here's what changed, what matters for knowledge work, and the Gemini CLI migration deadline.

The models got faster (and the cheap one isn't cheap anymore)

Gemini 3.5 Flash is the headline model. Google claims 4× faster output than other frontier models, and it beats the previous Gemini 3.1 Pro on coding and agentic tasks. It's also much more expensive: input pricing is roughly 5× that of Gemini 2.5 Flash. AI API prices are rising across all three big labs, Google included.

Gemini Omni is the other new model: conversational video generation and editing, "like Nano Banana, but for video." Early reactions are mixed: people praise the editing flow but report that the physics still breaks in demanding scenes. Gemini 3.5 Pro was announced too, with better reasoning, due next month.

The developer story: one platform, and a CLI being retired

Google folded its developer tooling into a single platform, Google Antigravity, with four surfaces over one shared agent system: Antigravity 2.0 (the desktop app), Antigravity CLI, Antigravity SDK, and Antigravity IDE.

Gemini CLI is being retired, and Antigravity CLI replaces it. If you use Gemini CLI through a free account or Google AI Pro/Ultra, you have until June 18, 2026 to migrate. Enterprise Gemini Code Assist licences and API-key users keep it. Your Agent Skills, Hooks, Subagents and Extensions all carry over, so the migration should be easy if you do it before the deadline.

The scale, for context

A few numbers from the keynote: Google now processes over 3.2 quadrillion tokens a month, up 7× year over year. The Gemini app is at 900 million monthly users, more than double last year. 8.5 million developers build with these models every month.

Everything else, briefly

Other announcements: Gemini Spark (a personal 24/7 agent), Daily Brief, Ask YouTube and Ask Maps, voice in Docs and Gmail, Google Pics for image editing, Project Genie and Co-Scientist on the research side, 15 Chrome features for the agentic web, and a new $100/month Google One AI Ultra tier.

References

• Google I/O 2026 collection: https://blog.google/innovation-and-ai/technology/developers-tools/google-io-2026-collection/
• Sundar Pichai on I/O 2026: https://blog.google/innovation-and-ai/sundar-pichai-io-2026/
• Gemini 3.5 Flash announcement: https://blog.google/innovation-and-ai/models-and-research/gemini-models/gemini-3-5/
• Gemini CLI to Antigravity CLI transition: https://developers.googleblog.com/en/an-important-update-transitioning-gemini-cli-to-antigravity-cli/

Related

• Gemini 3.5 Flash
• Gemini 3.5 Pro
• Gemini Omni
• Nano Banana
• Gemini Spark
• Google Antigravity
• Antigravity 2.0
• Antigravity CLI
• Antigravity SDK
• Antigravity IDE
• Gemini CLI
• Gemini Code Assist
• AI API prices are rising
• Gemini 3
• Gemini
• Agentic Era

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