GPT-5.6 Terra
Balanced tier of the GPT-5.6 series, between the flagship Sol and the cost-efficient Luna, for everyday coding, reasoning, and agent workloads.
Pricing
Input$2.50 / 1M checked Jul 19, 2026
Output$15 / 1M checked Jul 19, 2026
A Pro serving mode (reasoning.mode=pro) is available at the same list price.
Cost bandBalanced
Free tierNo free API tier.
Limits
Context window1M checked Jul 19, 2026
DeploymentOpenAI API
OpenAI-compatible APIYes
ModalitiesText, Image input, PDF input
Where it fits
Best forProduction assistants, coding, and agent backplanes at moderate cost.
Business fitThe mid-price default for teams on the OpenAI stack.
Capabilities
Reasoning modesFunction callingStructured outputsWeb searchMCP
Change history
- Jul 9, 2026New modelGPT-5.6 Terra added to the index $2.50 / 1M in / $15 / 1M out, 1M context. Terra tier of the GPT-5.6 series. OpenAI models index
Data
Last checkedJul 19, 2026
Cross-checked againstopenrouter.ai/openai/gpt-5.6-terra
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