What Happened
On 2026-07-09, OpenAI released GPT-5.6 for general availability, comprising flagship Sol, balanced Terra, and lower-cost Luna.
Why It Matters
It established a tiered model family around agent capability and cost, while introducing explicit coordination of parallel agents for demanding work. The family also separated the choice of model from the amount of work assigned to it. That distinction matters as deployment decisions increasingly depend on task completion, latency, and total resource use rather than token price alone.
Technical Details
The ultra setting coordinated multiple agents across parallel tasks. OpenAI emphasized token efficiency, coding, professional workflows, and computer use. The general release followed a June 26 limited preview, which should not be confused with July 9 availability.