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AI / Google Antigravity Gemini Fundamentals Interview Questions

What are the current Gemini model families and which should you use for different tasks?

As of mid-2026, the Gemini model ecosystem spans multiple generations. The Gemini 3.x series is the primary production line, with Gemini 3.5 Flash being the newest generally-available flagship.

Current Gemini models mid-2026
ModelAPI IDBest forNotes
Gemini 3.5 Flashgemini-3.5-flashFrontier agentic and coding tasksGA; Pro-level intelligence at Flash price
Gemini 3.1 Pro Previewgemini-3.1-pro-previewComplex reasoning, highest qualityPreview only; no free tier via API
Gemini 3.1 Flash-Litegemini-3.1-flash-liteHigh-volume cost-sensitive tasksMost cost-efficient in Gemini 3 series
Gemini 2.5 Flashgemini-2.5-flash-001Stable production workloadsStable; 10 RPM / 250 RPD free tier
Gemini 2.5 Progemini-2.5-proStrong reasoning on stable modelStable; very restricted free tier
Gemini 2.5 Flash-Litegemini-2.5-flash-liteCheapest option$0.10/1M input; 15 RPM free tier

Decision guide:

  • Prototyping/testing: Gemini 2.5 Flash (free tier, stable)
  • Production with cost sensitivity: Gemini 3.1 Flash-Lite or 2.5 Flash-Lite
  • Production needing reasoning: Gemini 2.5 Pro (stable) or 3.1 Pro Preview (higher capability but preview)
  • Agentic and coding tasks: Gemini 3.5 Flash (flagship as of June 2026)

Important: Gemini 2.0 Flash and 2.0 Flash-Lite were shut down on June 1, 2026. All Gemini 1.0 and 1.5 models already return 404 errors.

Which Gemini model became generally available in June 2026 as the flagship for agentic and coding tasks?
What happened to Gemini 2.0 Flash on June 1, 2026?

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