Model by OpenAI

GPT-5.6 Terra

GPT-5.6 Terra is the middle tier of OpenAI's 5.6 series, and it suits teams that want everyday coding and agent work at a lower price than Sol.

Checked 2026-11-05

GPT-5.6 Terra is the middle tier of OpenAI's 5.6 series, and it suits teams that want everyday coding and agent work at a lower price than Sol. OpenAI's page says it is comparable to the mini tier of earlier GPT-5 families. The context window is 1,050,000 tokens, with up to 922,000 for input and 128,000 for output. It takes text and images and returns text. Knowledge cutoff is 16 February 2026. Price is $2 per million input tokens and $12 per million output tokens, which matches OpenRouter. That is half of Sol's current promotional input rate and 60 percent of its output rate. Prompts above 272,000 input tokens cost double on input and one and a half times on output for the whole request. It runs on Chat Completions, Responses and Batch. Realtime, fine-tuning and embeddings are not supported. OpenAI's page gives no release date or lifecycle status, and OpenRouter listed it on 9 July 2026. One catch: the 272,000 token line means long-context jobs cost more than the headline price suggests. We would use it as a default worker model and send only the hardest tasks to Sol. Figures come from OpenAI's model page and OpenRouter. We have not run it ourselves.

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Questions

What is the context window of GPT-5.6 Terra?

1,050,000 tokens, with up to 128,000 tokens of output.

How much does GPT-5.6 Terra cost?

$2 per million input tokens and $12 per million output tokens, checked 31 October 2026.

Can I run GPT-5.6 Terra on my own hardware?

No. The weights are not published, so you use it through the maker's API or a hosting provider.

Who makes GPT-5.6 Terra?

OpenAI makes it, and released it on 9 July 2026.

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