Previewing GPT‑5.6 Sol: a next-generation model (openai.com)

OpenAI has announced a limited preview of the GPT-5.6 series, featuring three models: Sol, Terra, and Luna, catering to various needs from flagship capabilities to cost-effective solutions. Sol, positioned as the most powerful model, incorporates a robust safety framework designed to mitigate high-risk activities and enhance system reliability against real-world attacks. Users will get access to tiered pricing across models, with Sol being priced at $5 input/$30 output. The significance of GPT-5.6 lies in its advancements across key domains such as coding, biology, and cybersecurity, demonstrating superior performance in tasks like vulnerability research while using fewer resources than its predecessor, GPT-5.5. Notably, it introduces a `max` reasoning mode for improved decision-making and an `ultra` mode leveraging subagents for complex tasks. The model employs comprehensive safeguards to restrict prohibited uses while continuing to support beneficial applications. As OpenAI explores feedback during this preview, they aim to refine these safeguards further, enhancing the balance between safety and accessibility as they prepare for broader rollout.