Late Night Rumor Roundup: Gemini 3.1 Is Coming, and Google Isn't Being Subtle About It
Google employees are posting cryptic hints on X, a Gemini 3.1 Pro Preview showed up on a leaderboard tracker, and Deep Think just got a major upgrade. Here's everything we know. UPDATE: It shipped.
Update: It Shipped (February 19)
Called it. Less than 24 hours after this post went up, Google launched Gemini 3.1 Pro. Not a preview, not a limited rollout. The full model, available in the Gemini app, the API, Vertex AI, Gemini CLI, and Android Studio. Same pricing as Gemini 3 Pro.
The benchmarks are real:
| Benchmark | Gemini 3.1 Pro | Gemini 3 Pro | Claude Opus 4.6 |
|---|---|---|---|
| SWE-Bench Verified | 80.6% | 76.2% | 78.2% |
| ARC-AGI-2 | 77.1% | ~38% | N/A |
| GPQA Diamond | 94.3% | 84.0% | 83.3% |
| LiveCodeBench Pro | 2887 Elo | N/A | N/A |
The ARC-AGI-2 score doubled compared to Gemini 3 Pro. SWE-Bench Verified jumped to 80.6%, which puts it ahead of Claude Opus 4.6’s 78.2%. Google is claiming it “retakes the AI crown” and multiple outlets are reporting it beats both Claude Opus 4.6 and GPT 5.2 on most benchmarks.
Whether benchmark wins translate to better real-world coding is a different question. We’ll be testing it in Gemini CLI and reporting back. But the rumors below? Every single one of them turned out to be right.
Welcome to the first Late Night Rumor Roundup. This is a new series where we collect the hints, leaks, and cryptic tweets that show up after business hours. Tonight: Gemini 3.1.
The Tweets
Logan Kilpatrick is Google’s Product Lead for AI Studio and the Gemini API. At 5:56 PM on February 18 he posted a single word to X:
Gemini
No context, no link, no follow-up. Just “Gemini.” It pulled 184K views and 302 comments in a few hours.
Then Ammaar Reshi, a Product and Design Lead at Google DeepMind who helped introduce Gemini 3 Pro at the AI Engineer Code Summit, posted this at 7:21 PM:
Read the numbers in the word. G3m1ni. Gemini 3.1.
The replies figured it out fast. One person wrote “So it’s 3.1.” Ammaar’s follow-up was just as obvious: “sorry today was a busy prep day” plus the eyes emoji.
When someone in the replies said they were “kinda pissed” Ammaar didn’t announce Lyria 3 (Google’s music model) that morning, Ammaar replied: “hahahaha sorry today was a busy prep day.” Prep for what?
The Leaderboard Leak
This isn’t just reading tea leaves from tweets. On February 11, a model ID labeled “Gemini 3.1 Pro Preview” appeared in the Artificial Analysis Arena database, a third-party model comparison and leaderboard tracker. No benchmark scores were attached. Just the model ID. MacObserver covered it on February 12, calling it “a credible breadcrumb, not a confirmed product release.”
Google’s official docs still list Gemini 3 Pro and Gemini 3 Flash as the current models. No changelog entry, no pricing update, no documentation for a 3.1 variant. But the model ID is sitting right there in a public tracker, and a week later Google employees are posting thinly veiled hints.
Where Gemini 3 Pro Stands Right Now
Some context on what a 3.1 upgrade would build on. Gemini 3 Pro leads the LMArena leaderboard at 1501 Elo and tops WebDev Arena at 1487 Elo. On SWE-bench Verified it scores 76.2%, though Gemini 3 Flash actually beats it at 78%. JetBrains reported a 50%+ improvement over Gemini 2.5 Pro in solved benchmark tasks.
Where it falls short is real-world coding. Claude Opus 4.6 still beats it on SWE-bench and Terminal-bench for practical software engineering work. A 3.1 release that closes that gap would matter a lot.
The Deep Think Connection
Google shipped a major upgrade to Gemini 3 Deep Think on February 12, the same day the 3.1 model ID leaked. Deep Think is Gemini’s specialized reasoning mode. The upgrade expanded it from math and competitive coding into chemistry, physics, and other scientific domains.
The numbers: 48.4% on Humanity’s Last Exam, 84.6% on ARC-AGI-2, Legendary Grandmaster on Codeforces. It solved 18 previously unsolved research problems and disproved a mathematical conjecture from 2015.
That’s a big release by itself. Shipping a 3.1 model upgrade on top of it would fit a pattern: roll out the reasoning improvements first, then follow with the full model refresh.
What We Think Is Happening
Here’s the timeline:
- February 11: “Gemini 3.1 Pro Preview” model ID shows up on Artificial Analysis Arena
- February 12: Google ships the Deep Think upgrade
- February 18: Two Google employees post obvious hints on X
- February 18: Ammaar Reshi calls it a “busy prep day”
“Prep day” means something is about to ship. The timing (Tuesday evening tweets, prep day comments) points to a Thursday announcement. Google has a track record of launching Gemini updates on Thursdays.
If Gemini 3.1 Pro is real, the question developers actually care about is whether it closes the gap with Claude Opus 4.6 on practical coding. Gemini 3 Pro already wins on general benchmarks and web development. But most working developers care more about whether the model can handle real codebases, multi-file refactors, and debugging sessions. That’s where Claude has held the lead.
Update: It was real, and it shipped the next day. See the update at the top of this post.
Sources
- Gemini 3.1 Pro launch announcement (Google Blog, Feb 19)
- Gemini 3.1 Pro “retakes AI crown” (VentureBeat, Feb 19)
- Gemini 3.1 Pro beats Claude Opus 4.6, GPT 5.2 on most benchmarks (OfficeChai, Feb 19)
- Gemini 3.1 Pro Preview spotted on Artificial Analysis Arena (MacObserver, Feb 12)
- Gemini 3 Deep Think upgrade announcement (Google Blog, Feb 12)
- Deep Think upgrade details (9to5Google, Feb 12)
- Logan Kilpatrick’s “Gemini” tweet (X, Feb 18)
- Ammaar Reshi’s “G3m1ni” tweet (X, Feb 18)
- Gemini 3 Pro benchmarks (Vellum)
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