GPT-5.6 Terra
GPT-5.6 Terra targets more complex text and reasoning work, but the maximum output usage required for reliable preauthorization is not yet locked. For now, this page provides verified information and alternative paths only.
Online use is currently unavailable
This page is for reviewing the model's capabilities, use cases, and public references. The model does not appear in the home workbench, and you cannot submit generation tasks with it.
At a glance
What is this model like?
A detail page does not mean the model is available. Terra stays out of the selector, and neither standard nor streaming messages can be submitted or charged. It is unavailable rather than discontinued.
Key facts
Quickly assess whether this model fits your use case.
Also known as
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Common questions
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Selection guide
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Compare currently available models such as Claude Sonnet 5 and Claude Opus 4.7.
Use this page for status updates rather than inferring context or output limits from the series name.
Save one clearly scored sample each for option analysis, editing, and decision memos.
Popular comparisons
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Model comparison
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Practical usage insights
Practical guidance based on public sources, current on-site limits, and representative tasks.
Advanced positioning increases preauthorization risk
A higher tier is not a quality guarantee
Capabilities
Structured conversation input
Tiered reasoning
Tool use
Use cases
Option analysis
Professional long-form writing
Complex research questions
Prompt tips
Rank your constraints
Request evidence layers
Control task scope
Why choose it
What to know first
Currently unavailable
This page is for reviewing the model's capabilities, use cases, and public references. The model does not appear in the home workbench, and you cannot submit generation tasks with it. An advanced GPT-5.6 candidate between the lightweight Luna and flagship Sol tiers.
FAQ
Related models
Compare these similar candidates before deciding.
Claude Opus 4.8
Claude Opus 4.8 is designed for high-complexity text analysis and consequential writing. Kyeo AI offers text-only chat with up to 20,000 characters per message and an explicit 4,096-token maximum output.
Claude Sonnet 5
Claude Sonnet 5 is the more balanced Claude candidate in this batch for research, code explanation, and structured writing. Its maximum output on this site is 4,096 tokens.
Claude Opus 5
Claude Opus 5 is a flagship candidate for high-complexity text work. Kyeo AI limits each message to 20,000 characters, includes the 40 most recent submitted messages, and caps output at 4,096 tokens.
Sources
Content is based on model documentation, feature references, and the settings available on Kyeo AI.
GPT-5.6 Terra's conversation, reasoning, tool, and token-rate contract is confirmed. Because there is no provable maximum output-usage bound, this site keeps runtime access disabled.
Records verified capabilities, rates, and the unmet preauthorization requirement.