Gemini 3.5 Pro 2026: Coding, Agents, 2M Context, and the CodeFast Gemini Package
Google shipped Gemini 3.5 Flash at I/O on May 19, 2026 and held Pro back for June while it stays in internal testing. This guide explains what to expect from Gemini 3.5 Pro, the benchmarks Flash already revealed, its coding and agentic performance, expected pricing, and API access via the CodeFast Gemini package.
Gemini 3.5 Pro is the flagship model of the Gemini 3.5 family that Google DeepMind announced at Google I/O on May 19, 2026. The family launched the same day with Flash; Pro was held back in internal testing and, per Google's official wording, will arrive "next month" — that is, in June 2026. Sundar Pichai named coding, agents, reasoning, and memory as Pro's focus areas.
Expectations are high because Flash already beats Gemini 3.1 Pro on coding and agentic benchmarks. That implies Pro is not just a step ahead but a genuine SOTA candidate for harder reasoning and long-term memory. Google holding Pro back is telling: per the official statement, the capability step change is large enough that an extra testing round was chosen for a responsible rollout.
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