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Zenithon raises $10 million in new funding to develop world models for extreme physics Funding
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TLDRocket
30 September 2026
The biggest thread today wasn’t just another model update—it was OpenAI tightening its grip on the plumbing of AI products. At DevDay, OpenAI launched “Sign in with ChatGPT,” letting users authenticate partner apps with a ChatGPT account and, crucially, route usage through a single ChatGPT subscription. Starting with 16 launch partners, app requests can be deducted from a user’s Plus or Pro allowance instead of forcing separate subscriptions or API keys. It’s a subtle shift: OpenAI moves from being a backend provider to becoming the identity and budget layer that sits in front of many AI experiences.
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