My response is going to be about Gemini generally and less about NotebookLM.

Google's last frontier model release was Gemini 3.1 Pro, which was in February of this year[1]. At the time, it was ahead of the (at the time) flagship models of Opus 4.6 and GPT 5.2/5.3. From my recollection of the time, it was the best model in the world.

Anthropic released Opus 4.5 Nov '25, 4.6 in Feb '26, 4.7 in April, 4.8 in (late) May. Then Fable in June. 4.7 beat 3.1 Pro on multiple metrics. Fable eats it for breakfast. However, I want to note the 3 month gap between those first two Opus versions.

OpenAI released 5.2 Dec '25, 5.3 Codex Feb '26, 5.3 Instant Mar, 5.4 Mar, 5.5 (late) May, 5.6 July. 5.4 beats 3.1 Pro on agentic benchmarks[2], seems to be similar/losing on non-agentic. 5.5 seems stronger than 3.1 Pro[3].

Gemini 3.5 Pro is alleged to be launching within the week. Why do I type this all out? Because I think Google is getting a bad rap. They are delayed on a frontier release by a month or two and are being regarded as if they cannot release frontier models. I think their last release demonstrates strength and we need to see a weak release before we call them "behind" (in any reasonable sense). These companies swap back and forth constantly. I recall a multi-month span where 2.5 Pro was just the best thing out there by a large margin (in my opinion).

[1]: https://blog.google/innovation-and-ai/models-and-research/ge...

[2]: https://www.anthropic.com/news/claude-opus-4-7

[3]: https://www.anthropic.com/news/claude-opus-4-8

My wild guess is Google isn’t willing to play as dirty as the others wrt data acquisition.

I share your sentiment. I'm still paying for Gemini but it's almost useless to me. Google has some serious internal problems. Perhaps Gemini is merely being plagued by aggressive cost controls, or perhaps there are deeper flaws in Google’s approach. Either way, I can't trust NotebookLM with serious work and have stopped using it.

Apple is placing a major bet on Google and Gemini for iOS 27. If Gemini's decline is any indication of what's to come, Apple could be in serious trouble in six month's time.

Antigravity sucks so bad that I have started to feel that google really doesn't wanna compete, they just wanna hang in there at number 2 or 3, to just annoy the number 1 and 2.

I was still using Gemini CLI even though Claude is better, just cause of inertia. Then one day it started refusing to work, saying I need to install Antigravity instead. Idk if that's an IDE or has a leaner CLI, but doesn't matter, I'm gone. I don't care how the sausage is made, don't randomly break the thing I'm using.

Also enshittification is slowly starting. Yesterday I asked Gemini (in the Android app) for a recommendation for an app for sound recording. Instead of it answering I got a popup to allow Gemini access to open the app store (or something like that, I didn't allow it). When I declined it just stopped the conversation. It was actually hard to get it to just reply with a list of apps. And I have an AI subscription with Google!

Yeah, it grinds my gears. They could probably have lightning speed inference and the best model if they were interested in doing so.