Google Adds Gemini 3.8 Flash To AI Mode

Google has added Gemini 3.8 Flash to AI Mode's model menu on the same day it released the model, making it available to Google AI Pro and Ultra subscribers worldwide, according to Robby Stein, VP of Product for Google Search. This marks the third Flash release in six weeks, following Gemini 3.7 Flash on August 14, and means the model options in AI Mode can change within a single reporting cycle, so testers should log the model name with every test. Free-tier AI Mode users still get only the default model, and Google has not announced whether 3.8 Flash will become the default.

Google has added Gemini 3.8 Flash to AI Mode’s model menu on the same day it released the model. Robby Stein, VP of Product for Google Search, announced https://x.com/rmstein/status/2095176293751124182 the rollout on X, writing that 3.8 Flash is “available today in AI Mode for Google AI Pro & Ultra subs around the world.” Google’s launch post https://blog.google/innovation-and-ai/models-and-research/gemini-models/3-8-flash-and-3-8-flash-cyber/ lists AI Mode alongside the Gemini app and Google Sheets under the consumer products where Pro and Ultra subscribers can use the model. That’s a change from three weeks ago, when the 3.7 Flash post https://blog.google/innovation-and-ai/models-and-research/gemini-models/introducing-gemini-3-7-flash/ named only Spark in the Gemini app and AI Mode followed a day later. Search is now part of the model launch itself, which means the model you can select in AI Mode changes on Google’s model schedule. What Changed You pick 3.8 Flash from the “+” icon in AI Mode’s “Ask anything” bar. Stein’s screenshot shows it under “Gemini 3 models” between “Auto” and “Pro,” the same section where 3.7 Flash appeared on August 14. 3.7 Flash isn’t visible in the screenshot. Stein’s post doesn’t say what Auto routes to, and it doesn’t state a language. The 3.7 Flash rollout was English only. Background Google says https://blog.google/innovation-and-ai/models-and-research/gemini-models/3-8-flash-and-3-8-flash-cyber/ 3.8 Flash is its third Flash release in six weeks, three weeks after 3.7 Flash. The model behind AI Mode has changed at a similar pace. Gemini 3 Pro arrived as an option https://www.searchenginejournal.com/google-brings-gemini-3-to-searchs-ai-mode/561376/ in November, Gemini 3 Flash became the default https://www.searchenginejournal.com/google-gemini-3-flash-becomes-default-in-gemini-app-ai-mode/563572/ in December, and Gemini 3.5 Flash replaced it https://www.searchenginejournal.com/gemini-3-5-pro-delayed-over-coding-bloomberg-reports/582660/ as the global default at I/O in May. Gemini 3.7 Flash joined the menu https://www.searchenginejournal.com/google-brings-gemini-3-7-flash-to-ai-mode-in-search/585923/ on August 14. In February, I covered https://www.searchenginejournal.com/why-google-runs-ai-mode-on-flash-explained-by-googles-chief-scientist/567807/ why Google runs AI Mode on Flash models. Lower latency and cost let them run at Search scale, and each new generation gets distilled into a Flash version for production. Why This Matters Anyone who tested AI Mode citations on 3.7 Flash in the past three weeks was testing a model that doesn’t appear in the menu Stein screenshotted today. Three Flash releases in six weeks means the options in a paid AI Mode test can change inside a single reporting cycle. A reading taken on 3.7 Flash in mid-August and one taken on 3.8 Flash today came from different models, so a gap between them doesn’t isolate anything your content did. Log the model name with every test. Free-tier AI Mode users don’t get a model choice. They get the default, and nothing announced today changes it. Looking Ahead The next thing to watch is whether 3.8 Flash moves from an option to the default, which is the path both earlier Flash tiers took. A default change would reach the free tier, and neither Stein’s post https://x.com/rmstein/status/2095176293751124182 nor Google’s launch post https://blog.google/innovation-and-ai/models-and-research/gemini-models/3-8-flash-and-3-8-flash-cyber/ says whether that’s coming. Google’s support page https://support.google.com/websearch/answer/16011537 for AI Mode’s model menu is where that would show up, and it still lists only “Fast” and “Pro,” unchanged since 3.7 Flash arrived on August 14. Until it moves, the menu in front of you is the only record of which model answered. Featured Image: Samuel Boivin/Shutterstock