GPT-5.6 Sol Matches Mythos Preview, Gains Ultra Subagent Mode
- Source
- OpenAI
- Time
- 6:04 PM
- Weight
- 94/100
OpenAI has announced a limited preview of its GPT-5.6 model series, featuring the flagship Sol, the balanced Terra, and the entry-level Luna models. This update introduces a "max" reasoning effort for deep analytical tasks and an "ultra" subagent mode, which coordinates multiple agents to handle complex workflows.
According to early benchmarks, Sol demonstrates significant improvements in coding, biology, and cybersecurity, matching the performance of specialized models like Mythos Preview while significantly reducing the number of output tokens required for similar tasks. The new models are supported by a layered safety stack and an extensive red-teaming process that utilized 700,000 GPU hours to test for vulnerabilities and potential misuse.