GPT-5.5 vs Claude: The Frontier Model You Can Use vs the One You Can't
<p>There has been a lot of noise around Anthropic’s Claude Mythos: a restricted frontier model presented as so powerful, especially in cybersecurity, that it cannot be released broadly. What I hadn’t fully appreciated is that OpenAI’s GPT-5.5, released on <strong>April 23, 2026</strong>, appears to operate in the same frontier capability band — but with one crucial difference: GPT-5.5 is commercially available to users and developers now, while Mythos remains gated behind defensive cybersecurity access programs.</p><p>This episode unpacks what that means. Is Anthropic’s restriction primarily a responsible safety decision, a compute-capacity constraint, a clever positioning move — or all three? And did OpenAI just undercut the Mythos narrative by releasing a model that is broadly usable, deeply agentic, and close enough on capability to change the strategic conversation? The bigger point is not just which lab is ahead. It is that frontier AI is moving from chatbot novelty to autonomous work infrastructure — and the access model may matter as much as the benchmark score.</p><p></p>