OpenAI launches GPT-5.6 family: Sol, Terra and Luna

OpenAI announced general availability of the GPT-5.6 family on July 9, 2026.

The family includes Sol (flagship), Terra (balanced) and Luna (cost-efficient).

Pricing is $5/$30 per million tokens for Sol, $2.5/$15 for Terra, and $1/$6 for Luna.

A new "ultra" mode coordinates four parallel agents for complex tasks, and Sol outperformed Claude Fable 5 on the Agents’ Last Exam benchmark.