Shipped: GPT-5.6 Sol, Terra, and Luna
Sol, the flagship for long-horizon work. Terra balances intelligence and cost. Luna for fast, cheap, high-volume jobs. Switch with /model
GPT-5.6 Sol, GPT-5.6 Terra and GPT-5.6 Luna at a glance
- GPT-5.6 Sol: frontier model for complex professional work.
- GPT-5.6 Terra: balances intelligence and cost.
- GPT-5.6 Luna: optimized for cost-sensitive workloads.
| Model | Context | Intelligence Index | Input | Output | Cache read | Plans |
|---|---|---|---|---|---|---|
| GPT-5.6 Sol | 1.05M tokens | 47 | $5/M | $30/M | $0.50/M | GOAT and above |
| GPT-5.6 Terra | 1.05M tokens | 42.1 | $2/M | $12/M | $0.20/M | Pro and above |
| GPT-5.6 Luna | 1.05M tokens | 37.3 | $0.20/M | $1.20/M | $0.02/M | Go and above |
Prices are per 1M tokens. Specs, pricing and plans are from each model's page as of September 28, 2026, including any deal running that day, so they can differ from the launch pricing above: GPT-5.6 Sol, GPT-5.6 Terra, GPT-5.6 Luna. Intelligence Index scores are from Artificial Analysis.
Use them
1cmd --model gpt-5.6-sol
2cmd --model gpt-5.6-terra
3cmd --model gpt-5.6-lunaOr type /model in a session and pick one. You can switch mid-session without losing context.
Try Command Code
The best coding agent for open models, in your terminal or on your desktop.
1npm i -g command-codeDesktop App · Docs · X · Discord
