OpenAI: GPT-6.1 Terra
GPT-6.1 Terra is a reasoning model from OpenAI released on Oct 26, 2026. It reads text, images and files and writes text, with a 1.05M token context window and up to 128K tokens per reply.
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It costs $1 per million input tokens and $5 per million output tokens. Cached input bills at $0.05, 95% less than fresh input.
It supports tool calling, structured JSON output and prompt caching.
15 providers serve it, including Azure, Vercel AI Gateway and AI/ML API.
- Modalities
- In / out price
- $1 / $5 per 1M
- Context
- 1.05M
- Max output
- 128K
- Released
- Oct 26, 2026
- Knowledge cutoff
- Jun 2026
- Tool calling
- Structured output
- Reasoning
- Prompt caching
- Open weights
- Free to use
GPT-6.1 Terra pricing
USD, as listed on Oct 27, 2026. Most bills are input heavy, so the cached input rate matters as much as the headline price.
| Input | $1 / 1M tokens | |
|---|---|---|
| Output | $5 / 1M tokens | |
| Cached input (read) | $0.05 / 1M tokens | 95% off input |
| Cache write | $1.25 / 1M tokens | |
| Prompts over 200K | $2 in, $7.50 out | long context rate |
| Prompts over 272K | $2 in, $7.50 out | long context rate |
GPT-6.1 Terra providers
15 providers serve it, including Azure, Vercel AI Gateway and AI/ML API. Each host sets its own price and limits, so the cheapest one is not always the one with the longest context.
| Provider | Input /M | Output /M | Cache read /M | Context | Max output |
|---|---|---|---|---|---|
| OpenAI First party | $1 | $5 | $0.05 | 1.05M | 128K |
| Azure | $1 | $5 | $0.05 | 1.05M | 128K |
| Vercel AI Gateway | $2 | $10 | $0.10 | 1.05M | 128K |
| AI/ML API | $1 | $5 | $0.05 | 1.05M | 128K |
| Azure Cognitive Services | $1 | $5 | $0.05 | 1.05M | 128K |
| CommandCode | $1 | $5 | $0.05 | 1.05M | 128K |
| DevPass (LLM Gateway) | $1 | $5 | $0.05 | 1.05M | 128K |
| Eden AI | $1 | $5 | $0.05 | 1.05M | 128K |
| Kilo Gateway | $1 | $5 | $0.05 | 1.05M | 128K |
| LLM Gateway | $1 | $5 | $0.05 | 1.05M | 128K |
| LowRouter | $1 | $5 | $0.05 | 1.05M | 128K |
| Merge Gateway | $1 | $5 | $0.05 | 1.05M | 128K |
Showing 12 of 15 providers: the lab first, then the major clouds, then the cheapest resellers.
What GPT-6.1 Terra costs per month
Pick a workload close to yours or type your own volumes.
Supported request parameters
What you can set when you call GPT-6.1 Terra through an OpenAI compatible API.
- Tools
tools - Structured outputs
structured_outputs - Reasoning
reasoning
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GPT-6.1 Terra questions
How much does the GPT-6.1 Terra API cost?
$1 per million input tokens and $5 per million output tokens, with cached input at $0.05. Prompts over 200K tokens bill at $2 input and $7.50 output. The estimator on this page turns that into a monthly bill for your own workload.
What is the context window of GPT-6.1 Terra?
1,050,000 tokens of input, and it can write up to 128,000 tokens in one reply. As a rough guide, a million tokens is around 750,000 English words.
Which providers serve GPT-6.1 Terra?
15 providers serve it, including Azure, Vercel AI Gateway and AI/ML API. Prices differ by host, so the Providers table on this page lists each one with its input and output price.
Does GPT-6.1 Terra support tool calling?
Yes. It accepts tool definitions and can return JSON that matches a schema, which is what an agent needs to call your APIs.
Is GPT-6.1 Terra open source?
No. OpenAI serves it through an API only, so you cannot download the weights or host it yourself.
When was GPT-6.1 Terra released?
Oct 26, 2026, with training data up to Jun 2026.
Catalog data from models.dev (MIT licensed), refreshed daily, last on Oct 27, 2026. The summary is written from these facts.