ChatGPT's powerful GPT-5.6 models arrive, but not for you

OpenAI has released its most powerful GPT-5.6 models (Sol, Terra, and Luna) but only to trusted partners and organizations following a U.S. government request for limited rollout. PCWorld reports that the flagship Sol model directly competes with Anthropic's restricted Fable and Mythos models, featuring enhanced layered safeguards against misuse. A wider public release remains uncertain due to regulatory concerns about the models' advanced capabilities and potential security implications. The U.S. government ban on Anthropic's powerful Fable and Mythos models has everybody spooked. That's why it's a little surprising that OpenAI, Anthropic's biggest rival, is slowly rolling out its latest and most powerful GPT models.