GPT-5.6 Terra
GPT-5.6 Terra is the middle tier of the GPT-5.6 family. OpenAI describes its position as similar to the mini tier used in earlier GPT-5 releases.
Tier names do not define the context limit
Despite that middle-tier position, it has a 1,050,000-token window and a 128,000-token output ceiling. Reasoning ranges from none to max. The published prices apply different full-request rates when input exceeds 272,000 tokens.GPT-5.6 Terra official model documentation
Compare visual and text work separately
Practical guidance. For a document workflow, review field extraction, chart interpretation and final writing as separate outcomes. Use the same source documents and reasoning settings when comparing models. A lower price is useful only if the required work remains accurate.
Specifications & access
| Detail | Value and conditions |
|---|---|
| Access | API |
| Model identifiers | gpt-5.6-terra |
| Context window | 1,050,000 tokens Published model context; input and output share this budget GPT-5.6 Terra official model documentation |
| Maximum output | 128,000 tokens Published maximum output; bounded by the remaining context GPT-5.6 Terra official model documentation |
| Input price | 2 USD per million tokens Standard text processing; inputs up to 272,000 tokens GPT-5.6 Terra official model documentation |
| Output price | 12 USD per million tokens Standard text processing; inputs up to 272,000 tokens GPT-5.6 Terra official model documentation |
| Input and output | text, image in; text outGPT-5.6 Terra official model documentation |
| Maximum input | 922,000 tokensGPT-5.6 Terra official model documentation |
| API routes | Chat Completions (v1/chat/completions); Responses (v1/responses); Batch (v1/batch)GPT-5.6 Terra official model documentation |
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