OpenAI released GPT-5.6 on July 9, 2026, opening its most powerful system to the public with three variants named Sol, Terra, and Luna. The release also introduced ChatGPT Work, a new agent designed to execute complete tasks rather than just answer questions.

The three tiers represent different performance and cost points. Sol is the flagship, achieving state-of-the-art results across coding, knowledge work, cybersecurity, and science while outperforming competing models with fewer tokens at lower estimated cost. Terra strikes a balance for everyday work, and Luna offers maximum efficiency at less than half the estimated cost of the previous GPT-5.5.

Pricing and Availability

Pricing is per million tokens. Sol costs $5 for input and $30 for output. Terra runs $2.50 input and $15 output. Luna is $1 input and $6 output. ChatGPT Work is rolling out to Pro, Enterprise, and Edu users immediately, with Plus and Business plans receiving access within days.

The model introduces a new max reasoning effort, allowing Sol extra time to reason deeply on complex tasks. OpenAI also added ultra mode, which deploys subagents to accelerate work on complex problems beyond single-agent setups.

Work Features

ChatGPT Work gathers context across connected apps and files to create documents, spreadsheets, and presentations. It works across web, phones, and computers, initially rolling out to Mac and Windows apps before reaching web browsers. Users can now hand work to an AI agent that understands their existing workflow rather than starting from scratch with each prompt.

The government delayed this release. OpenAI previewed GPT-5.6 on June 26 but held back from public access per U.S. government request, running the models through a safety review before the July 9 public launch.