GPT-5.6 Sol vs. Claude Fable 5: Comprehensive Multi-Modal AI Performance Report
Generated: 2026-07-15 · API: Gemini 2.5 Flash · Modes: Summary
GPT-5.6 Sol vs. Claude Fable 5: Comprehensive Multi-Modal AI Performance Report
Clip title: GPT-5.6 Sol vs Claude Fable 5 – The ULTIMATE Comparison Test! Author / channel: Bijan Bowen URL: https://www.youtube.com/watch?v=kRX6YEje9Bs
Summary
This video presents a comprehensive, head-to-head comparison between OpenAI’s GPT-5.6 Sol and Anthropic’s Claude Fable 5, evaluating their capabilities across a range of challenging, multi-modal tasks. The tests were designed to push the boundaries of current AI models by requiring them to perform complex, multi-step actions, interact with various tools and APIs, and produce tangible, functional outputs. The video highlights how each model approached tasks involving physical design, creative writing, game development for vintage and modern hardware, and interactive problem-solving.
One set of tests involved physical design, where models were tasked with replicating a missing computer front panel for an Acer Predator G7700. This included generating a 3D-printable model based on reference photos and measurements, with a specific requirement for the design to be separable into attachable pieces due to printer volume limitations. GPT-5.6 Sol was quicker and produced a more faithful recreation of the original design, though both required some manual intervention in CAD software to be truly printable. Claude’s initial attempt was notably inferior, lacking the correct tapering and intricate details, though a second attempt showed some improvement, it still required significant human adjustment. Both models also generated magazines, with Claude’s “Ghost Signal” being visually consistent and readable, while GPT’s “Counterweight” was more abstract and challenging to comprehend.
The video also delved into game development, testing the AIs’ ability to create functional games. For a retro PC test, models were asked to develop an open-world crime game for a vintage iBook (Mac OSX 10.4 Tiger), requiring them to handle network transfer, compilation, and execution. GPT-5.6 Sol excelled, seamlessly delivering a playable 3D game named “LowRider City” with period-correct graphics, functioning gameplay, and map areas. Claude Fable 5, while eventually producing a graphically superior game, required extensive troubleshooting, manual Xcode installations, and ultimately crashed or presented a black screen. In a similar vein, for an Apple Vision Pro mixed reality skateboard simulator, GPT-5.6 Sol successfully fixed initial menu navigation issues to deliver a playable game with procedural levels and good visual style. Claude also managed to resolve its crashing issue after feedback, but the game world turned almost entirely black, rendering it unusable.
Finally, the models were tasked with creating a 3D PC repairman game with a detailed storyline, interactive scenes, cutscenes, and text-to-speech (TTS) dialogue. GPT-5.6 Sol delivered a highly interactive game where players performed tasks like replacing a CMOS battery, complete with voice acting and cinematic elements. Claude Fable 5 also produced a functional game with a storyline, but it featured a frustrating mini-game in a server room and some invisible characters, hindering the overall experience. Overall, GPT-5.6 Sol consistently demonstrated higher autonomy, efficiency, and accuracy in these complex, multi-step challenges compared to Claude Fable 5, which often required more human intervention to achieve usable or competitive results.
Video Description & Links
Description
Timestamps:
00:00 - Intro 02:05 - 3D Model Test Overview 04:02 - 3D Model Test 10:26 - 3D Model Results 13:10 - AI Magazine Test Overview 16:10 - Fable 5 Magazine Result 18:12 - GPT-5.6 Sol Magazine Result 19:53 - Magazine Results 21:26 - Retro Mac GTA Test Overview 23:02 - GPT-5.6 Sol GTA Result 28:45 - Fable 5 GTA Result 33:58 - GTA Results 35:35 - Apple Vision Pro Test Overview 36:24 - GPT-5.6 Sol Vision Pro App Result 39:10 - Fable 5 Vision Pro App Result 43:08 - Vision Pro App Results 43:38 - UltraCode Game Test Overview 47:20 - GPT-5.6 Sol Ultra Gameplay Result 54:47 - Fable 5 UltraCode Gameplay Result 01:12:55 - Gameplay Results 01:13:58 - Closing Thoughts
In this video, we compare GPT-5.6 Sol against Claude Fable 5 in some of the most difficult tests we have run so far.
We test both models across a range of complex creative and coding tasks, including 3D model creation, an AI magazine project, a retro Mac GTA-style game, an Apple Vision Pro app, and a long UltraCode gameplay test.