Claims

Promise · Their own work or organisation

“And Pro to come…”

Demis Hassabis, Google DeepMind CEO, on X · 20 May 2026 · Post by @demishassabis on X, 2026-05-20 (X)

Google DeepMind will release a Gemini 3.5 Pro model following Gemini 3.5 Flash.

Resolved false The record shows it did not happen or was not so.

Said for an organisation they lead or work for; it counts on both records.

What would count as true or false

No deadline given; judged as of the date of evaluation. True: Google or Google DeepMind released a model named Gemini 3.5 Pro after Gemini 3.5 Flash, available to outside users or developers (a public preview or experimental release through the Gemini app, AI Studio or Vertex AI counts). Mostly true: a Gemini 3.5 Pro was released, but under a slightly different name or in a different order from what was implied, or only to a broad paid tier. Mostly false: it was only announced, or shown to a small group of trusted testers, with no wider release. False: Google states it was cancelled or replaced (for example, it went straight to a different model with no 3.5 Pro), or a dated model lineup published well after the claim shows no 3.5 Pro release.

Evidence

1. Gemini 3.5: frontier intelligence with action Google (blog.google) · 19 May 2026 Own record

   “We’re also hard at work on 3.5 Pro. It's already being used internally, and we look forward to rolling it out next month.”

2. Google AI Studio Google (ai.google.dev, Gemini API release notes) Own record

   “**Gemini 3.6 Flash and Gemini 3.5 Flash-Lite generally available (GA)**: Released stable, production-ready versions of our latest 3.x Flash models:”

3. Gemini 3.5 Pro: what happened to Google's delayed model AIWIZ Digital Marketing (aiwiz.uk) · 17 July 2026

   “On 30 September a Google spokesperson told Reuters that Google no longer plans to release 3.5 Pro.”

4. Google AI Studio Google AI for Developers (Gemini API release notes) · 19 May 2026

   “Released `gemini-3.5-flash`, the generally available (GA) version of [Gemini 3.5 Flash](/docs/models/gemini-3.5-flash), our most intelligent model for sustained frontier performance on agentic and coding tasks.”

5. Google AI Studio Google AI for Developers (Gemini API release notes) · 13 October 2026

   “Released [Gemini 4 Argon](/docs/models/gemini-4-argon) (`gemini-4-argon`), our most capable model built for complex coding, agentic, math, and science tasks.”

6. Google AI Studio Google AI for Developers (Gemini API release notes) · 18 September 2026

   “For any new projects, use our latest models: 3.5 Flash-Lite or 3.8 Flash.”

7. DD News DD News (republishing Reuters) · 4 November 2026

   “Google no longer plans to release Gemini 3.5 Pro, which CEO Sundar Pichai originally said would be released in June, according to the company spokesperson.”

8. Gemini 4 Carbon tops AI index; cyber defenders get it first R&D World · 28 October 2026

   “When Google announced Argon on September 30, a spokesperson told Reuters that the company no longer plans to release 3.5 Pro and that Argon is larger than Google’s earlier Pro models.”

9. Gemini 4 Carbon tops AI index; cyber defenders get it first R&D World · 28 October 2026

   “At its I/O conference, Google promised Gemini 3.5 Pro in June. That model slipped repeatedly, and Bloomberg reported its coding performance fell short of internal goals.”

10. Gemini 4 Enters Pre-Training as Gemini 3.5 Pro Stays in Testing WindowsForum · 28 July 2026

    “The current status is clearer than the rumor cycle around it: Gemini 3.5 Pro is still in testing with partners.”

Reasoning

Google's Gemini 3.5 post said 3.5 Pro would roll out the next month (E1), and the API release notes record the release of 3.5 Flash on May 19, 2026 (E4). Independent reports say the model slipped repeatedly and was still in partner testing in July (E10, E11). Reuters, republished by DD News, and R&D World both report that a Google spokesperson said the company no longer plans to release Gemini 3.5 Pro. Google announced Gemini 4 Argon on September 30, when a spokesperson said 3.5 Pro was no longer planned, and released Argon in October (E9, E8, E6). This meets the criterion for cancellation or replacement, so the claim resolved false.

Cite this claim

Demis Hassabis, “Google DeepMind will release a Gemini 3.5 Pro model following Gemini 3.5 Flash.” (said 20 May 2026). Verdict: resolved false. Reliability API, claim c_9ac02f397a48, method 0.1.0+c876030c. https://epistacklabs.com/claims/c_9ac02f397a48