OpenAI Pauses ChatGPT Pro Signups on GPT-6 Astra Demand, Rules Out 2026 IPO

The demand shock is the concrete news: OpenAI stopped accepting new $200/month ChatGPT Pro subscribers after GPT-6 Astra's rollout overwhelmed capacity, while keeping API access, ChatGPT Go, and Plus open. It's a rare admission that the company can't provision compute fast enough for its flagship reasoning model — a striking signal of both Astra's appeal and the compute crunch across the industry.

GPT-6 Astra itself reached general availability on Amazon Bedrock this week with a 1M-token context window and, notably, is OpenAI's first model rated 'Critical' on cybersecurity — the same classification thread running through the autonomous-hacking disclosures. AWS's Matt Garman highlighted Astra's ability to 'reason across competing inputs' and work across large document collections and codebases.

Alongside the capacity pause, Altman made two governance moves. He publicly endorsed Anthropic's 'pace the frontier' slowdown call, and he confirmed OpenAI will not pursue an IPO in 2026, saying it would be 'an ill-advised moment' given safety concerns — a pointed contrast with Anthropic's reported $2T Nasdaq ambitions.

The skeptical read is that a signup pause is also convenient scarcity marketing, and that Altman's safety-first framing coincides neatly with a moment when going public would invite exactly the scrutiny the autonomous-hacking incidents are generating. Readers should watch whether Pro signups reopen quickly (suggesting a genuine capacity fix) or stay closed, and whether the IPO stance holds into 2027.