GPT-5.6 Terra is served by 3 providers and supports tool calling, structured outputs, and reasoning.
GPT-5.6 Terra is a balanced model in OpenAI's GPT-5.6 series, positioned between the flagship Sol tier and the cost-efficient Luna tier. It is suited for everyday coding, reasoning, and agentic tasks where capability and cost need to be balanced, offering strong performance at roughly half the cost of Sol.
Modalities
In / out price
$2 / $12per 1M
Context
1.1M
Released
Jul 9, 2026
Knowledge cutoff
Feb 2026