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OpenAI announced a limited preview on 2026-06-26 for three GPT-5.6 variants

2026-06-26 · 17:10 UTC ·@OpenAI ·0 min read

Brief

OpenAI previewed three GPT-5.6 models on 2026-06-26: Sol, a frontier model focused on stronger coding, scientific, and cybersecurity capabilities with an advanced safety stack; Terra, a balanced model for efficient everyday tasks; and Luna, a fast, affordable option aimed at high-volume workloads.

Why it matters

OpenAI announced a limited preview on 2026-06-26 for three GPT-5.6 variants: Sol (frontier), Terra (balanced), and Luna (fast/affordable).

Key details

  • GPT-5.6 Sol is described as a next-generation frontier model with stronger capabilities in coding, science, and cybersecurity and is paired with OpenAI's most advanced safety stack.
  • GPT-5.6 Terra is positioned for efficient everyday work; GPT-5.6 Luna is positioned for high-volume, cost-sensitive usage.
Source evidence

Introducing a limited preview of GPT-5.6 Sol, our next generation frontier model, as well as GPT-5.6 Terra, a balanced model for efficient, everyday work, and GPT-5.6 Luna, a fast and affordable model for high-volume work.

openai.com/index/previewing-…

Link

Previewing GPT-5.6 Sol: a next-generation model

OpenAI previews GPT-5.6 Sol, a next-generation model with stronger capabilities in coding, science, and cybersecurity, paired with its most advanced safety stack.
openai.com