2026
OpenAI Releases the GPT-5.6 Model Family, Led by Flagship 'Sol'
OpenAI made its GPT-5.6 model family generally available, led by the flagship 'Sol' variant alongside the mid-tier 'Terra' and low-cost 'Luna.' The models target complex reasoning, agentic workflows, coding, science, and cybersecurity, and followed a limited preview begun on June 26; the launch had been delayed pending a U.S. cybersecurity and national-security review. Sol was priced at $5 per million input tokens and $30 per million output tokens and rolled out across ChatGPT, Codex, and the API.