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OpenAI CEO Sam Altman announces new models Sol and Terra, with Sol matching GPT-5.5 at the same price and Terra offering 5.5-level performance at half the price, but launching in limited preview due to US government request.
GPT-5.6 has been released for a limited preview, with availability restricted due to government regulations.
GPT-5.5-Cyber is now in limited preview for defenders, offering a capable model for securing critical infrastructure.