gpt-6-1-terra-pro
GPT-6.1 Terra Pro is the same underlying model as GPT-6.1 Terra, served in pro reasoning mode for higher-quality answers on complex tasks. Pro mode spends far more reasoning tokens than standard mode.
Pricing: Input 240 credits / 1M tokens (≈ $1.20), Output 1200 credits / 1M tokens (≈ $6.00).
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GPT-6.1 Terra Pro API on ModelFold
GPT-6.1 Terra Pro is the same underlying model as GPT-6.1 Terra, served in pro reasoning mode for higher-quality answers on complex tasks. Pro mode spends far more reasoning tokens than standard mode. Try GPT-6.1 Terra Pro in the ModelFold Playground, then call it from your own code through an OpenAI-compatible chat completions API.
What Is the GPT-6.1 Terra Pro API
GPT-6.1 Terra Pro at a glance
GPT-6.1 Terra Pro is a chat model from OpenAI. It accepts text, images and files (such as PDF) as input and returns text, with a context window of up to 1M tokens.
Use it without hosting anything
On ModelFold you call GPT-6.1 Terra Pro with a single API key — no model weights to download and no inference servers to run. The same key also works for the other chat, image, video and audio models on ModelFold.
Core Capabilities of GPT-6.1 Terra Pro
Up to 1M tokens of context
Keep long conversations, large documents and sizeable code in a single request, so the model can reason over the full material instead of fragments.
Understands images and files (such as PDF)
Besides text, GPT-6.1 Terra Pro accepts images and files (such as PDF) as input, so a single request can combine instructions with visual or other media.
Function calling
GPT-6.1 Terra Pro supports tool (function) calling: describe your functions in the request and the model returns structured calls your code can run — the basis for agents and integrations.
Adjustable reasoning effort
Choose a reasoning effort level (low, medium or high) per request to balance depth of thinking against speed and token usage.
Structured outputs
Ask for JSON that follows a schema (response_format), which makes extraction, classification and system integrations more reliable.
How to Use GPT-6.1 Terra Pro on ModelFold
- 1
Step 1: Try it in the Playground
Open the Playground at the top of this page, type a prompt and see how GPT-6.1 Terra Pro responds before writing any code.
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Step 2: Create an API key
Sign in to ModelFold and create an API key in the console. Keep it secret and send it as a Bearer token.
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Step 3: Send a request
Call POST https://modelfold.ai/v1/chat/completions with "model": "gpt-6-1-terra-pro" and your messages. Existing OpenAI-compatible SDKs work by changing the base URL and key.
- ✓
Step 4: Ship and monitor
Integrate the response into your product and check token usage and spend for every call in the console logs.
What You Can Build with GPT-6.1 Terra Pro
Analysis and complex reasoning
Work through research questions, data interpretation, planning and other problems that need careful step-by-step reasoning.
Autonomous agents
Build agents that plan multi-step tasks, call your tools and APIs, and keep working toward a goal across long sessions.
AI coding assistants
Generate, explain, debug and refactor code, review pull requests and work through multi-file changes in developer tools and IDE plugins.
Screenshot and image understanding
Read screenshots, charts, diagrams and photos alongside text — for UI review, visual QA or turning images into structured data.
Frequently Asked Questions
What is GPT-6.1 Terra Pro?⌄
GPT-6.1 Terra Pro is the same underlying model as GPT-6.1 Terra, served in pro reasoning mode for higher-quality answers on complex tasks. Pro mode spends far more reasoning tokens than standard mode.
Which inputs does GPT-6.1 Terra Pro support?⌄
GPT-6.1 Terra Pro accepts text, images and files (such as PDF) and returns text. Through ModelFold you can send text and images (OpenAI-style image_url content); in the Playground you can also attach documents, which are converted to text.
How long is the context window of GPT-6.1 Terra Pro?⌄
Up to 1M tokens, shared between your input and the model’s output.
Does GPT-6.1 Terra Pro support function calling?⌄
Yes. GPT-6.1 Terra Pro supports tools / function calling through the standard tools parameter of the chat completions API.
How is GPT-6.1 Terra Pro billed on ModelFold?⌄
Pay as you go by tokens: input and output tokens are charged at the per-million-token prices shown on this page. There is no monthly fee, and failed requests are not charged.
How do I call GPT-6.1 Terra Pro through the API?⌄
Send a POST request to https://modelfold.ai/v1/chat/completions with "model": "gpt-6-1-terra-pro", using your ModelFold API key as the Bearer token.
| Input | 240 credits 1M tokens≈ $1.20 |
| Output | 1200 credits 1M tokens≈ $6.00 |
Billed per token: input and output are priced separately, and thinking tokens count as output. The Playground charges exactly the same way.
Read API docs →AI Agents · Claude Code / Cursor / Trae →curl https://modelfold.ai/v1/chat/completions \
-H "Authorization: Bearer $MODELFOLD_API_KEY" \
-H "Content-Type: application/json" \
-d '{"model":"gpt-6-1-terra-pro","messages":[{"role":"user","content":"Hello"}]}'