GPT-5.6 Terra

Available

OpenAIFrontierProprietary

Balanced, everyday-work tier of OpenAI's GPT-5.6 series, officially previewed June 26, 2026. OpenAI positions Terra as competitive with GPT-5.5 while being roughly 2x cheaper. Shares the series' new `max` reasoning effort and `ultra` subagent mode and OpenAI's GPT-5.6 safety stack. Begins as a limited preview via the API and Codex for vetted partners after U.S. government review, with broad availability planned in the following weeks. Priced at $2.50 / $15 per million input/output tokens.

Official page ↗

Specifications

License: Proprietary
Weights: Not released
Architecture: unknown
Parameters: Undisclosed
Context window: 1.5M tokens
Max output: 128K tokens
Knowledge cutoff: Jan 31, 2026
Price (in / out, $/M): $2.5 / $15
Modalities: TextVisionAudioCode

Benchmarks

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Vendor-reported figures are claims until independently verified. See methodology.