OpenAI broadly launched the GPT-5.6 family on July 9, 2026 — led by flagship Sol, with cheaper Terra and Luna variants and a new “ultra” capability setting. The release emphasizes performance per dollar, polished computer use, and gains across coding, knowledge work, cyber, and science.
The Family
| Model | Input | Output | Positioning |
|---|---|---|---|
| GPT-5.6 Sol | $5/M | $30/M | Flagship capability |
| GPT-5.6 Terra | $2.5/M | $15/M | Balanced workhorse |
| GPT-5.6 Luna | $1/M | $6/M | Budget tier |
Benchmarks
Sol scores 64.6% on SWE-bench Pro and 88.8% on terminal-bench — leading tool-use evaluations. Terra delivers ~90% of Sol’s capability at half the price. Luna targets high-volume cost-sensitive workloads. All three support 1M token context.
The Ultra Setting
“Ultra” is OpenAI’s highest-capability setting for the hardest tasks — extending reasoning effort similar to the o-series approach. Expect higher latency and cost per query with the benefit of better outcomes on complex multi-step problems.
Computer Use Improvements
GPT-5.6 includes the most polished computer use yet — the model can operate software interfaces with improved reliability, opening new agentic workflows for automation.
Impact on the Market
Terra’s positioning at 2x cheaper than GPT-5.5 reset the competitive pricing picture. The family approach lets teams optimize cost across use cases without changing providers.
Related: AI Model Comparison 2026 · AI Models in 2026: Complete Guide
