GPT 5.6 vs Claude Fable 5: The Best AI Model Across 6 Practical Use Cases
I tested both models for designing websites, building 3D games, publishing video clips, prototyping mobile app features, and more. Here's my verdict for each use case.
Dear subscribers,
OpenAI just made GPT 5.6 available to everyone and I’m here to answer your most burning question:
Is GPT 5.6 better than Claude Fable 5?
The answer is, it depends. 😅
Watch my tutorial to see me test both models head-to-head for building a travel website, 3D Star Fox game, mobile app, and more.
Timestamps:
(00:00) GPT-5.6 vs Claude Fable 5 compared
(01:45) Build an interactive travel website
(05:44) Create a 3D Star Fox-style game
(09:39) Edit and publish short videos with browser use
(15:10) Plan and build a mobile app feature
(19:34) Get personalized life and business advice
(22:17) Improve and clean up a personal AI OS
(24:37) My takeaway on each model’s strengths and weaknesses
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GPT 5.6 vs. Fable benchmark and cost comparison
GPT 5.6 comes in three models: Sol, Terra, and Luna.
Sol is the flagship model and based on TerminalBench it actually performs slightly better than Claude Fable 5 at coding:
But I think OpenAI’s biggest advantage is model efficiency and cost. GPT 5.6 Sol is 50% cheaper than Claude Fable 5 at API prices:
That’s a big deal because enterprises are increasingly looking for the most cost-effective model. However, benchmarks only tell half the story, let me show you how both models perform on the 6 use cases below:
1. Build an interactive travel website
GPT has historically lagged behind Claude on front-end design so I wanted to see if GPT 5.6 has closed that gap. I’m planning a trip to Japan in December so I gave both models my Google Doc itinerary and the prompt below:
Build a beautiful interactive travel website for my Japan itinerary Google Doc.
Organize it by day. For each day, include the date, area, activities, and dinner plans, plus images for major attractions.
Make it feel like a real travel catalog that I can share with my family. Add a 3D WebGL element to the hero so it looks more immersive and animated.
Tip: Ask AI to “add a 3D WebGL element to the hero banner” if you want to create websites with beautiful animated 3D graphics
I ran the same prompt through GPT 5.5, GPT 5.6, and Fable:
GPT 5.5 created a functional website but botched the 3D hero image.
GPT 5.6 created an animated torii gate and found more relevant photos.
Fable 5 created beautiful animated snowflakes in a winter scene.
Watch my video to see how all 3 websites look.
Verdict: Tied because GPT 5.6 has really closed the gap with Fable on frontend design.
P.S. We’ve started hosting regular live workshops in my Slack community for AI builders. Upcoming workshops include:
July 17 - AI native design (design.md, components, etc) with Julie Xu
July 24 - Building production apps with Colin Matthews
August - Deep dive on AI evals with Hamel Husain
All workshop recordings will be shared here for paid subscribers.
2. Create a 3D Star Fox style game
Growing up, Star Fox was one of my favorite games on the Super Nintendo. So naturally, I had to ask both GPT 5.6 and Claude Fable 5 to build a fully playable Star Fox level complete with enemies, power-ups, and even a boss battle.
Both produced incredibly impressive results:
Here’s the exact prompt that I used to build these games in one shot: