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2026-07-09GPT-5.6 Explained: Sol, Terra, and Luna — The Model Family That Cleared a White House Review
OpenAI's new model family GPT-5.6 became the first AI model to clear a White House review before shipping. Here's how Sol, Terra, and Luna differ, and how the rollout unfolded.
OpenAI launched GPT-5.5 on April 23, 2026 — six weeks after GPT-5.4. The model delivers better results with fewer tokens, a 400K context window in Codex, and meaningful gains on scientific research and agentic coding. API pricing is 2x GPT-5.4. API access is coming soon.