Guess what? Claude Opus 4.5 is here, and people are saying it is the world's best coding agent. But I needed some proof, so I put Opus 4.5 head-to-head with Gemini 3 Pro.
- The Showdown: Building a probate estate dashboard from scratch using "Idea Browser" concepts.
- The Tools: Comparing Cursor vs. Google's new "Anti-Gravity" IDE.
- The Secret Sauce: How to set up "Elevated Direct Response" skills in Claude for better copy.
I built a SaaS app to see who would win, and the results might shock you. I did it with my friend James, the "Boring Marketer," and in this article, we are going to show you how Opus 4.5 stacks against Gemini 3 Pro and also how you can get the most out of Opus 4.5. Hint: it has to do with setting up Claude skills, and we show you exactly how to do it.
1. The Setup: Opus 4.5 vs. Gemini 3 Pro
James is going to open the curtains and show everyone sort of how he's using the latest models. We want to dig into Claude Opus 4.5, jam a little bit on Gemini 3.0 Pro, and show people how to build landing pages and websites as a non-designer, non-engineer that are driving great conversion.
We decided to do a live play test. Let's use Opus 4.5 with a front-end design skill to see what we can come up with, and then let's do Gemini 3 Pro with the same prompt and see what we can come up with there as well.
The Challenge: "Estate Clear"
We grabbed an idea from Idea Browser: an estate dashboard for keeping families informed during probate. Estate executives face constant phone calls and texts from anxious relatives saying "What's happening with dad's estate?"
Estate Clear creates a real-time family dashboard where executives can post updates, upload documents, and track progress while family members get instant notifications instead of playing phone tag.
📷 [IMAGE_PROMPT: A clean, modern SaaS dashboard UI for "Estate Clear" showing a timeline of probate milestones, a document upload section, and family member activity feed. The style should be trustworthy and calm, using soft blues and greys.]
Visualizing the "Estate Clear" dashboard concept.
2. The Landing Page Face-Off
I think that if I were to create a prediction here, Gemini is going to come up with something more outside of the box, while Claude is going to create something a little more of what you'd expect.
I pasted the full description into Cursor for Claude and Google AI Studio for Gemini. The prompt was simple: "I want to create a conversion optimized landing page for my new startup build ahtml that I can view locally you must use the front end design skill to generate the page."
Claude Opus 4.5 Results
This is Opus 4.5 with the front-end design skill one shot. We have the description and literally like a one to two-sentence prompt. The copy hits hard: "Stop answering the same questions from everyone in the family."
I like the overall aesthetic. Going through probate and dealing with family issues isn't exciting, so it has a nice, subtle tone. It’s not screaming in my face with wild colors. It is clearly not just using the same typical purples and AI stuff.
Gemini 3 Pro Results
Gemini’s version goes hard with the headline: "Keep the family united." It positions it as the private dashboard for executives to share updates, documents, and milestones with the whole family at once.
It is very clear, but I don't know—it doesn't have the same polish. However, Gemini did something interesting: it put AI features in the MVP. It suggested, "Don't know what to say? Let AI write the update." That is really interesting. If you're trying to create a startup right now that gets traction, having some of these AI-first ideas built into the landing page really helps.
| Model | Design Aesthetic | Unique Features |
|---|---|---|
| Claude Opus 4.5 | Clean, subtle, professional. Avoids "AI Purple." Excellent layout without scrolling. | Solid execution, production-ready look. |
| Gemini 3 Pro | More "vibrant" but slightly standard. Good use of emojis/illustrations. | Auto-included AI features (e.g., "AI Update Writer"). |
3. Deep Dive: The "Anti-Gravity" IDE & Nano Banana
One of the things I really like about Gemini and Google generally is how vertically integrated it is.
We decided to test Google's Anti-Gravity (their agentic IDE) to see if it performed differently than Gemini inside AI Studio. My hunch was that we'd get worse design out of Anti-Gravity, but it surprised us.
When we ran the prompt, it didn't just code—it generated a custom dashboard mockup image first to make the page look real using Nano Banana (Google's latest image model, officially Gemini Image). It generated a high-fidelity visual mockup that we could see before it wrote the HTML.
The result from Anti-Gravity was really cool. It used Nano Banana to create a visual, then built the code. The mockup had some alpha in it—wireframing it out visually before coding is how a real design team works.
4. How to Setup Claude Skills (The "Sauce")
Don't sleep on Claude 4.5 Opus with the front-end design skill—most people don't even know this skill exists.
To get the best results, you need to set up "Skills" in Claude Code. A skill is just a set of instructions the model references. Here is the playbook we use:
Step 1: The "Elevated Direct Response" Skill
I used the Perplexity MCP to research leaders like Cody Sanchez and Alex Hormozi. I asked Claude to break down exactly how they write copy. We combined that with my own writing samples to create a "Brand Voice" skill.
- Contrarian Hook: Start with a point of view that challenges the norm.
- Systems over Hacks: Focus on compound growth and long-term thinking.
- Direct Response DNA: Avoid empty brand speak. Drive action in a classy way.
Step 2: The Front-End Design Skill
You can install this with two simple prompts in Claude Code to access the plugin marketplace and install the design skill.
"All you do is enter this first one in, this adds sort of this Anthropic plug-in marketplace... and then you've got plug-in install front-end design."
This skill helps Claude avoid that typical "AI look" (gradients, standard layouts) and aims for production-grade interfaces. When you combine the Elevated Direct Response skill for copy and the Front-End Design skill for visuals, you become unstoppable.
Pros & Cons: Opus 4.5 vs. Gemini 3
👍 Claude Opus 4.5
- Superior Polish: Generated a cleaner, more professional aesthetic immediately.
- Better Logic: "Just gets it" when building complex functionality.
- Skill Integration: Custom skills (Design + Copy) create production-ready results faster.
👎 Gemini 3 Pro
- Inconsistent Design: Sometimes feels a bit more generic or "vibe coded" without tuning.
- Bug Potential: More likely to have small bugs in the initial output compared to Opus.
Final Verdict
Anecdotally, it feels like we have entered a new stratosphere of "vibe coding." Both models are outstanding MVPs. However, based on the two prompts we did, Estate Clear on Opus 4.5 beat Gemini 3 Pro. The design was cleaner, the logic was tighter, and it felt more like a finished product.
That said, Google's Anti-Gravity IDE with Nano Banana integration is a massive workflow advantage. The ability to generate UI assets and code in one environment is powerful.
Frequently Asked Questions
Is Claude Opus 4.5 better than Gemini 3 Pro for coding?
In our tests, Claude Opus 4.5 produced cleaner, more production-ready code with better aesthetic choices on the first try. However, Gemini 3 Pro excels in "creative" feature additions (like suggesting AI tools within the app) and has deep integration with Google's ecosystem.
What is the "Nano Banana" model mentioned in the review?
"Nano Banana" is the community nickname for Google's Gemini Image model (specifically the Flash/Pro Image variants). It is integrated into Google's tools like Anti-Gravity to generate high-fidelity UI mockups and assets directly within the coding workflow.
How do I install the Frontend Design skill in Claude?
You can install the skill within the Claude Code CLI environment by accessing the plugin marketplace. The specific command involves referencing the `anthropic-plugin-marketplace` and then running `plugin install front-end design` to give Claude specific design constraints.
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