●ARGON — gemini-4-argon is generally available as of 10/13, aimed at complex coding, agents, math and science●DEEP RES — The old Deep Research agent shut down on 10/23. If calls fail, move to deep-research-preview-04-2026●NANO — gemini-nano-banana-2.1 is GA (10/06). gemini-3.1-flash-image is deprecated with no shutdown date yet●MCP — One write-up cut an 85,000-token tool result to 310 tokens by wrapping it in an ADK FunctionTool●FLASH — gemini-3.7-flash and 3.5-flash now route automatically to newer Flash models (10/08)●NEW — Stop Re-Reading Every Crash Report: Gre…●ARGON — gemini-4-argon is generally available as of 10/13, aimed at complex coding, agents, math and science●DEEP RES — The old Deep Research agent shut down on 10/23. If calls fail, move to deep-research-preview-04-2026●NANO — gemini-nano-banana-2.1 is GA (10/06). gemini-3.1-flash-image is deprecated with no shutdown date yet●MCP — One write-up cut an 85,000-token tool result to 310 tokens by wrapping it in an ADK FunctionTool●FLASH — gemini-3.7-flash and 3.5-flash now route automatically to newer Flash models (10/08)●NEW — Stop Re-Reading Every Crash Report: Gre…

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gemini-3.8-flash¹ model selection¹ evaluation¹

◎ Updates/2026-09-15Intermediate

How I Decide Between 3.8 Flash and 3.7 Flash — A Fixed Set of 20 Questions

After swapping a model ID to a newer generation, the same input can start producing answers that feel split. Here is the 20-question evaluation set I keep, how I run both generations on equal footing, and the two numbers I use to decide.