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Text · Released Oct 2026

OpenAI GPT 6.1 Terra Pro

GPT 6.1 Terra in OpenAI's pro reasoning mode, which works longer on each answer for higher quality on hard tasks.

OpenAI's GPT 6.1 Terra Pro is a cloud text model. It is multimodal: alongside a text prompt it accepts images, then replies with generated text. Its context window handles up to 1.05M input tokens and up to 128K output tokens, and it supports adjustable reasoning effort for harder problems. Generation can be tuned with system instructions. It runs through OpenRouter using your own API key, from $1.00 per million input tokens.

Modality
Text
Available on
Model ID
openai/gpt-6.1-terra-pro
Specs
Released
Oct 2026
Pricing
$1.00 / 1M in · $5.00 / 1M out
Inputs
Text, Images
Context window
1.05M in · 128K out
Reasoning
Adjustable effort
Controls
System prompt
Real outputs

Samples

Generated with GPT 6.1 Terra Pro via OpenRouter. The same three prompts run against every text model in the catalog, shown verbatim, so the only thing that changes between two models’ answers is the model.

Short answer42 / 50 words

Explain what an API is to someone who has never written code. Do not use a restaurant or waiter analogy. Plain prose only — no headings, bullet points, or markdown formatting. Maximum 50 words.

An API is a set of rules that lets one piece of software request information or services from another. For example, a weather app can use an API to get a forecast from a weather service, rather than collecting the data itself.

Medium answer87 / 150 words

A two-person startup is deciding whether to build their own user authentication or use a hosted provider. Give them a clear recommendation, then the single strongest argument against your own recommendation. Plain prose only — no headings, bullet points, or markdown formatting. Maximum 150 words.

Use a reputable hosted authentication provider. For a two-person startup, it’s usually better to spend limited engineering time on the product than on securely implementing and maintaining login, password recovery, account protection, and security updates. The strongest argument against this choice is dependency: if the provider has an outage, raises prices, or makes migration difficult, access to your product and your costs may be outside your control. Before choosing one, check its reliability, pricing at your expected scale, and how easily you can export users and migrate.

Long answer205 / 190–220 words

Write a briefing for a non-technical executive explaining why their company's spending on AI is hard to predict, and what they can do about it. Cover at least three distinct causes. Plain prose only — no headings, bullet points, or markdown formatting. Write exactly 205 words.

AI spending is difficult to forecast because costs depend on more than the price of a model. Demand, technology choices, and organizational behavior can all change quickly, often at the same time. First, usage is unpredictable. A successful assistant may attract far more requests than expected, and longer conversations or larger documents cost more to process. Set budgets and usage alerts, test demand before a broad rollout, and charge costs to the teams generating them. Second, prices and performance vary across providers and models. A powerful model may be unnecessarily expensive for routine tasks, while a cheaper one may require extra checking. Compare total cost and quality, use simpler models where appropriate, and retain the ability to switch suppliers. Third, model fees are only part of the bill. Preparing data, connecting systems, securing information, monitoring results, and training staff can exceed initial estimates. Fund these activities explicitly, with an owner accountable for the full cost. Finally, benefits are uncertain. Errors, regulation, and changing business needs can force rework or delay savings. Review spending against measurable outcomes regularly, run small pilots, and stop or redesign projects that do not deliver. Forecast a range rather than a single number, and keep a contingency reserve for unexpected expenses.

About the creator

OpenAI

OpenAI builds GPT, DALL·E, the Sora family, and the open-weight gpt-oss models, and has been a central force behind the modern wave of generative AI.

openai.com ↗
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