GPT-6.1 Terra: Price, Benchmarks, API & vs Sol/Astra (Oct 2026)
GPT-6.1 Terra launched Oct 26, 2026: $1/$5 per 1M tokens, 1.05M context, 60% on Agents' Last Exam. API id, benchmarks and how it compares to Sol and Astra.
Quick answers
- What is GPT-6.1 Terra?
- OpenAI's fast, low-cost model in the GPT-6 family, released Oct 26, 2026. It is built for computer use, visual reasoning and clear writing, and replaces GPT-5.6 Terra.
- How much does GPT-6.1 Terra cost?
- $1 per 1M input tokens and $5 per 1M output tokens in the API, with cached input at $0.05. Batch and Flex are 50% off. That is half of GPT-6.1 Sol and one-tenth of GPT-6 Astra.
- Is GPT-6.1 Terra in the API?
- Yes, as gpt-6.1-terra. It takes text and image input, has a 1.05M-token context window and up to 128K output tokens.
- Who can use GPT-6.1 Terra in ChatGPT?
- Plus, Pro, Enterprise and Edu users, in ChatGPT Work and Codex.
- Is GPT-6.1 Terra better than Sol or Astra?
- Close on vision and computer use, and over 3x faster, but behind on hard coding. OpenAI recommends Sol or Astra for deep research and complex coding.
OpenAI released GPT-6.1 Terra on October 26, 2026, almost a month after GPT-6.1 Sol. It is the mid-priced model of the lineup: smarter than GPT-6 Luna, cheaper and faster than Sol and Astra, and tuned for the screen-and-document work that fills a workday.
1. GPT-6.1 Terra at a glance
Spec | GPT-6.1 Terra |
|---|---|
Release date | Oct 26, 2026 |
API model id | gpt-6.1-terra |
Input / output | Text and image in, text out |
Context window | 1,050,000 tokens |
Max output | 128,000 tokens |
Knowledge cutoff | Jun 1, 2026 |
Reasoning effort | none to max (default medium) |
Input price | $1.00 / 1M tokens |
Cached input | $0.05 / 1M tokens |
Output price | $5.00 / 1M tokens |
Batch / Flex | 50% off |
Fast mode | 2x standard |
Long prompts (>272K input) | 2x input, 1.5x output |
ChatGPT access | Plus, Pro, Enterprise, Edu (ChatGPT Work, Codex) |
2. GPT-6.1 Terra price
GPT-6.1 Terra price is the main story. At $1 in and $5 out per million tokens, it costs 50% less than GPT-5.6 Terra and GPT-6.1 Sol, and 10x less than GPT-6 Astra.
Model | Input / 1M | Output / 1M |
|---|---|---|
GPT-6.1 Terra | $1 | $5 |
GPT-6.1 Sol | $2 | $10 |
Claude Sonnet 5.5 | $2 | $10 |
Claude Opus 5.5 | $4 | $20 |
GPT-6 Astra | $10 | $50 |
Per task, the gap is bigger. On Agents' Last Exam at medium effort, Terra costs $0.29 per task versus $0.84 for GPT-5.6 Terra and $4.82 for GPT-6 Astra. In ChatGPT Work and Codex, your usage allowance also lasts longer on Terra than on Sol or Astra.
3. GPT-6.1 Terra benchmarks
Scores from OpenAI's launch charts, at max reasoning effort unless noted:
Benchmark | GPT-6.1 Terra | GPT-6.1 Sol | GPT-6 Astra | Claude |
|---|---|---|---|---|
Agents' Last Exam v1 | 60.0% ($1.01/task) | 58.6% | 59.3% ($7.24/task) | Opus 5.5: 63.2% ($8.82/task) |
Agents' Last Exam v1 (medium) | 57.6% ($0.29/task) | - | 57.6% ($4.82/task) | - |
MMMU-Pro (Vision) | 85.5% | 86.3% | 86.7% | - |
OSWorld 2.1 offline | 74.2% | 78.0% | 80.9% | Sonnet 5.5: 83.9% |
Terminal-Bench 4.0 | 50.3% | 55.9% | 58.2% | Sonnet 5.5: 70.6% |
Terminal-Bench-Science 0.1 | 58.3% | 57.0% | 68.1% | Opus 5.5: 63.3% |
- Computer use: Terra beats Sol and Astra on Agents' Last Exam at a fraction of the cost and finishes tasks over 3x faster on average.
- Vision: within about 1 point of Sol and Astra on MMMU-Pro.
- Factuality: on OpenAI's error-inducing prompt set, the low-effort error rate fell from 53.6% (GPT-5.6 Terra) to 16.7%; at max effort it fell to 4.3%.
- Coding: Terminal-Bench 4.0 more than doubled from 21.5%, but Terra still trails Sol, Astra and Claude Sonnet 5.5.
- Third party: on DualEntry's accounting benchmark Terra scored 78.2% (18th of 22) but was the fastest OpenAI model at 16.1 seconds per task.
4. GPT-6.1 Terra API
The GPT-6.1 Terra API id is gpt-6.1-terra. Tool calling runs through the Responses API, with computer use, hosted shell, code interpreter, web search, file search and MCP. Set reasoning effort from none to max; medium is the default. Good fits, per OpenAI: filling out forms, matching product photos to catalog entries, interpreting technical drawings, drafting proposals and editing videos.
Safety note: OpenAI's system card addendum treats Terra as Critical capability in cybersecurity, the same as GPT-6 Astra, so the same safeguards apply.
5. GPT-6.1 Terra vs. Sol vs. Astra: which to use
- GPT-6.1 Terra: high-volume agent work, screens, forms, documents, writing. Best price per task.
- GPT-6.1 Sol: harder reasoning and coding, at 2x Terra's price.
- GPT-6 Astra: the top model for deep research and the hardest coding, at 10x.
- GPT-6 Luna: cheapest, about one-tenth of Terra, for simple tasks.
6. Use GPT-6.1 Terra with your team
Yes, you can use GPT-6.1 Terra side by side with other top models in Sumus. Sumus is a group chat where AI employees work next to your team, and you can switch models per task: Terra for fast, cheap screen and document work, a heavier model when the job needs it. One thread, every model, no separate subscriptions.
FAQ
When was GPT-6.1 Terra released?
October 26, 2026, in ChatGPT Work, Codex and the OpenAI API.
What is the GPT-6.1 Terra price?
$1 per 1M input tokens, $0.05 cached input and $5 per 1M output tokens. Batch and Flex are 50% off; prompts over 272K tokens cost more.
What is the GPT-6.1 Terra context window?
1.05M tokens, with up to 128K output tokens.
Is GPT-6.1 Terra free?
Not on the free ChatGPT plan; it is for Plus, Pro, Enterprise and Edu users. In the API it is paid per token.
GPT-6.1 Terra vs GPT-5.6 Terra?
Terra 6.1 is cheaper (half price) and much stronger: 57.6% vs 42.6% on Agents' Last Exam at medium effort, and 50.3% vs 21.5% on Terminal-Bench 4.0.
Is GPT-6.1 Terra good for coding?
For everyday coding, yes. For complex coding, OpenAI recommends GPT-6.1 Sol or GPT-6 Astra; Claude Sonnet 5.5 also scores higher on Terminal-Bench 4.0.
Sources
- OpenAI: Introducing GPT-6.1 Terra
- OpenAI API model page: gpt-6.1-terra
- OpenAI Deployment Safety Hub: GPT-6.1 Terra system card addendum
- DualEntry accounting benchmark via Yahoo Finance
Update log
- — Oct 27: First published. GPT-6.1 Terra released Oct 26, 2026; specs, price and benchmarks from OpenAI.