GPT-5.6 Terra
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:
Find files by name, read directory structures, and grep for patterns.
Generate search queries and fetch results from the web.
Read file contents, including images for vision-capable models.
Suggest edits and apply them automatically.
Execute terminal commands and monitor output.
Control a browser to take screenshots, test applications, and verify visual changes. See the Browser documentation.
Generate images from text descriptions or reference images.
Ask clarifying questions while continuing to work in the background.
Retrieve rules based on type and description.
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. Individual plans include at least $20 of third-party Other Models usage each month (more on higher tiers). All prices are per million tokens.
| Name | ||||
|---|---|---|---|---|
| $2 | $2.5 | $0.2 | $12 | |
| $4 | $5 | $0.4 | $24 |
A Fast mode tier (gpt-5.6-terra-fast) is available for priority processing at 2x the standard rates.