OpenAI Previews GPT-5.6 Sol with Restricted Access and Cyber Guardrails

OpenAI released GPT-5.6 Sol, Terra, and Luna in a limited preview for government engagement. Sol is the most capable model for cybersecurity, competitive with Anthropic Mythos Preview on ExploitBench using one-third the tokens, but may block some legitimate requests due to dual-use safeguards.