GPT-5.6 Feels Like an Upgraded GPT-5.5
mark_k · x · 2026-07-11
The author describes GPT-5.6 as feeling like an "upgraded 5.5," noting that its performance is essentially built on the same base model named "Spud," but with added RL training. This makes it highly capable in agentic tasks, processing work rapidly like a machine.
However, the author feels it hasn't necessarily become "smarter" or "more knowledgeable," but rather functions as a reinforced execution-oriented version. The post also predicts that the next release will be GPT-6, which will be an entirely new and larger model.
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