Models & pricing

GPT-5.6 Terra

Model ID

gpt-5.6-terra

Context window

272k

Provider

OpenAI

Speed

Fast

Cost

Medium

Intelligence

High

GPT-5.6 Terra is the balanced model in OpenAI's GPT-5.6 family. It sits between Sol and Luna in capability and price, making it a strong choice for everyday Ask ASUME work that benefits from substantial reasoning without requiring the cost of GPT-5.6 Sol.

Selecting GPT-5.6 Terra changes how an Ask is answered. It does not change how ASUME builds or maintains the underlying company understanding.

Strengths

Strong everyday reasoning

Well suited to questions that require several reasoning steps without necessarily requiring the highest-capability model available.

Capability and cost

Terra provides more capability than Luna while remaining significantly less expensive than Sol.

Fast responses

A strong choice when reasoning quality matters but response speed is also important.

Substantial context

Suitable for Asks that require a meaningful amount of maintained company context to be considered together.

Limitations

Not the strongest GPT-5.6 option

GPT-5.6 Sol is better suited to the most demanding questions or cases where deeper reasoning capability is worth the additional cost.

Less suited to highly open-ended reasoning

Terra has less capacity than Sol for difficult problems requiring extended reasoning across many competing considerations.

More expensive than Luna

Straightforward questions with limited context may be handled more economically by GPT-5.6 Luna.

Available context

Maintained understanding

Uses the structured company understanding ASUME has already constructed and maintains over time. Answers come from that context rather than rebuilding the company from the beginning for every question.

Evidence & assumptions

Can use relevant evidence, sources, and explicit assumptions associated with the maintained understanding when they are made available to the Ask.

Multi-company context

Can reason across the maintained understanding of multiple companies when a question involves comparison, relationships, or portfolio-level analysis.

Available capabilities

Can use the capabilities ASUME makes available for the Ask. Availability depends on the product, workspace permissions, and the capabilities supported at the time of the request.

When to use GPT-5.6 Terra

GPT-5.6 Terra is a strong default when you want more reasoning capability than a lightweight model without paying for GPT-5.6 Sol on every question.

Everyday company analysis

Use Terra for company questions that require several reasoning steps while still benefiting from fast responses.

Comparing companies

Use Terra when comparing companies across several factors or considering differences between their needs, capabilities, constraints, or priorities.

Evaluating evidence

Use Terra when several pieces of evidence need to be considered together before forming an answer.

Detailed answers

Use Terra when you want a more substantial analysis while maintaining a balance between reasoning quality, speed, and cost.

Pricing

GPT-5.6 Terra is a directly selectable third-party model in Ask ASUME. Usage is billed at the ASUME rates below. All prices are per million tokens.

Name	Input	Cache Write	Cache Read	Output
GPT-5.6 Terra	€2.15	€2.70	€0.22	€12.90

The rates above are billed by ASUME and may differ from OpenAI's own API pricing. Choosing GPT-5.6 Terra affects only the model usage associated with the Ask.