GPT-5.6 Terra is the mid-tier model in OpenAI’s GPT-5.6 family. It sits between Sol and Luna on intelligence and price, making it a strong pick for everyday agentic coding when you want more capability than Luna without Sol’s cost.

Strengths

  • Solid multi-step coding and tool use at well under Sol’s per-token price.
  • Faster and cheaper than Sol for routine agent workflows.
  • Same GPT-5.6 family behavior: reasoning, tool calling, and agent loops.

Limitations

  • Not the peak of the GPT-5.6 family. For the hardest long-running tasks, GPT-5.6 Sol is the stronger pick.
  • Less capacity for open-ended reasoning chains than Sol.

Tools

GPT-5.6 Terra has access to all agent tools when used with Cursor including:

Learn more about how tools work and tool calling fundamentals.

Pricing

Cursor plans include two usage pools. GPT-5.6 Terra draws from the third-party Other Models pool, which charges at the rates below. All prices are per million tokens.

A Fast mode tier (gpt-5.6-terra-fast) is available for priority processing at 2x the standard rates.