This morning, I conducted an in-depth comparison test of GPT 5.6 SOL Ultra, Claude Fable 5, and Grok 4.5. I had all three models perform a comprehensive audit of my existing system backend code (approximately 185k lines), and finally aggregated the audit results and scored them separately. The conclusion is:


GPT 5.6 SOL utlra >= Claude Fable 5, and much cheaper, with the only downside being very slow speed, requiring 1.5X speed.
If Fable 5 is no longer open to ordinary users after July 12, customers will vote with their feet.
The Grok 4.5 model has basically caught up with the previous generation GPT 5.5 and Opus 4.8, making rapid progress. Its biggest advantages are very low price and extremely fast speed, with a 30U subscription that is more than enough to use. Currently, xAI has the most computing power; Musk still has deep pockets.
Will try Meta's new model Spark later.
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