OpenAI launches GPT-5.6 Sol, Terra and Luna — the most consequential day in AI model history

What happened

OpenAI launched three GPT-5.6 models on July 9, 2026: Sol (flagship), Terra (mid-range), and Luna (budget). This marks the first day in AI history when three frontier labs (OpenAI, SpaceXAI, and Anthropic) simultaneously had publicly accessible models.

Context and impact

The models were delayed by a government security review under Trump's new AI cybersecurity executive order from June 2026, requiring 30-day review before releasing powerful models. This is the first release following Department of Commerce approval. GPT-5.6 Sol Ultra achieves 91.9% on Terminal-Bench 2.1, surpassing all competitors including Claude Fable 5 (83.4%) and Grok 4.5.

Details

• Sol: $5/$30 per million tokens (input/output), Ultra mode deploys parallel subagents
• Terra: $2.50/$15 per million tokens, targeting production workloads
• Luna: $1/$6 per million tokens, surprisingly outperforms Terra on some benchmarks
• GPT-5.6 Sol runs on Cerebras hardware at up to 750 tokens/second (15x faster than GPU)
• Strong performance in coding, biology, and cybersecurity
• GPT-5.6 Sol Ultra leads Terminal-Bench 2.1 at 91.9%