Claude Opus 4.5 VS Gemini Pro 3 - who wins?

I sat down with James, the Boring Marketer, to stress-test Claude 4.5 Opus against Gemini 3 Pro for real-world coding and design work. Together we live-build and compare landing pages and clickable prototypes for an “EstateClear” probate-family dashboard, then zoom out into conversion copywriting frameworks, “elevated direct response” brand voice, and ad creative workflows. The episode is a practical walkthrough of how non-technical builders can go from idea → landing page → prototype → ads using modern AI tools without vibe-coded, low-converting sites.

Timestamps
00:00 – Intro
02:00 – Startup Idea: EstateClear
03:17 – Claude Opus 4.5
04:47 – Gemini 3.0 Pro
09:02 – Reviewing Opus’ landing page
11:16 – Reviewing Gemini’s version
12:17 – Comparing the two
17:29 – Reprompting Opus 4.5 and Gemini
19:02 – Google’s vertically integrated stack (AI Studio, Anti-Gravity, TPUs, Workspace)
21:50 – Nano Banana Pro and ad creative experiments
27:35 – Opus 4.5 builds a clickable EstateClear prototype
31:38 – Gemini’s prototype and comparing product depth
36:40 – Anti-Gravity + Nano Banana workflow for mockups and code
44:41 – Claude Skills Workflow and Best Practices
56:41 – Final Thoughts

James is running a black friday sale for his community ($199/yr) 33% off regular price: https://www.skool.com/the-vibe-market...

Key Points

Claude 4.5 Opus can act like a senior engineer for non-technical builders when paired with a tight skill and tools setup.
Conversion wins come more from “elevated direct response” copy and clear page architecture than from fancy visuals alone.
Claude’s front-end design skill meaningfully reduces “AI-looking” gradients and vibe-coded layouts, producing cleaner, production-grade UIs.
Live tests show Opus 4.5 generates more refined layouts and deeper product thinking, while Gemini often injects clever AI product features.
Google’s integration of Anti-Gravity, Nano Banana, and AI Studio points to a powerful end-to-end environment for shipping and promoting products.

Section Summaries

1. Opus 4.5, Gemini 3, and the Modern Builder Stack

Greg opens by asking what listeners will learn, and James explains his current setup: Claude Code with Opus 4.5 in the terminal, Gemini 3 Pro as a cursor/agent on the side, a handful of MCPs, and one API. He stresses that, as a non-engineer, Opus 4.5 feels like having a senior software engineer sitting beside him, especially for long, complex coding tasks. The key claim: Opus stays on track better than previous models, reducing vibe-coded-headaches and endless bug hunts. 

2. From Landing Pages to Clickable Prototypes and Full Apps

Next, they ask both models to build clickable prototypes of the EstateClear app. Opus 4.5 extends its design into a dashboard with progress tracking, recent activity, updates, documents, and family roles; James says it feels like a real product and notes Opus could also build the full backend with tools like Neon, Clerk, Stripe, and Vercel/Railway. Gemini’s prototype leans more into social-feeling updates and AI-assisted family messages. The consensus: both are strong MVPs, but Opus looks more thought-through as a product. 

3. Nano Banana Pro, Anti-Gravity, and the Bigger Ecosystem

They explore Google’s Anti-Gravity IDE, where Gemini 3 Pro first uses Nano Banana Pro to create a high-fidelity mockup and then writes HTML/CSS based on that image—mirroring how a real team would work. James also shares Nano Banana Pro ads he’s testing for Black Friday workshops and talks about using Gemini to research top-performing ad formats, then using Nano Banana for visuals. They close by zooming out to Google’s vertically integrated stack (Workspace, TPUs, devices, AI Studio, Anti-Gravity, Nano Banana) and how it, alongside Claude, is dissolving traditional design/dev bottlenecks.

The #1 tool to find startup ideas/trends - https://www.ideabrowser.com/

LCA helps Fortune 500s and fast-growing startups build their future - from Warner Music to Fortnite to Dropbox. We turn 'what if' into reality with AI, apps, and next-gen products https://latecheckout.agency/

The Vibe Marketer - Resources for people into vibe marketing/marketing with AI: thevibemarketer.com

Startup Empire - get your free builders toolkit to build cashflowing business - https://startup-ideas-pod.link/startu...
Become a member - https://startup-ideas-pod.link/startu...

FIND ME ON SOCIAL
X/Twitter:   / gregisenberg  
Instagram:   / gregisenberg  
LinkedIn:   / gisenberg  

FIND JAMES ON SOCIAL
X/Twitter: https://x.com/boringmarketer
LinkedIn:   / jadickerson