Summary
On October 26, 2026, OpenAI released GPT-6.1 Terra, a new mid-tier model in the GPT-6 family: according to OpenAI, it scores 15% higher than GPT-5.6 Terra at medium reasoning effort on the Agents' Last Exam benchmark, with standard API pricing of $1 per million input tokens and $5 per million output tokens, a 50% cut versus GPT-5.6 Terra and GPT-6.1 Sol, and it completes tasks over 3 times faster than GPT-6 Astra and GPT-6.1 Sol.
Event Overview
- Date: October 26, 2026 (OpenAI official announcement).
- Company: OpenAI.
- Event: OpenAI launched GPT-6.1 Terra, positioned as a fast, efficient mid-tier model for high-volume professional tasks. OpenAI said it delivers a "significant upgrade" over GPT-5.6 Terra, with strengths in drafting plans, reading technical drawings, filling in spreadsheets, and editing videos.
- Availability: Starting on the launch date, GPT-6.1 Terra is available to Plus, Pro, Enterprise, and Edu users in ChatGPT Work and Codex; developers can call it via the OpenAI API under the model name gpt-6.1-terra.
Key Facts
| Item | Detail |
|---|---|
| Launch date | October 26, 2026 |
| Company | OpenAI |
| Model | GPT-6.1 Terra (API model name gpt-6.1-terra) |
| Positioning | Fast mid-tier model: fine-grained visual reasoning + precise computer use + more natural writing |
| Availability | Plus / Pro / Enterprise / Edu users in ChatGPT Work & Codex; API developers |
| Standard API pricing | $1/M input, $0.05/M cached input, $5/M output tokens |
| Price change | 50% lower than GPT-5.6 Terra and GPT-6.1 Sol standard pricing |
Official Performance Claims
- Agents' Last Exam (medium reasoning): OpenAI reports GPT-6.1 Terra scores 15% higher than GPT-5.6 Terra at roughly one-third the per-task cost; it matches flagship GPT-6 Astra on score while costing about one-tenth the price per token.
- Highest reasoning effort: GPT-6.1 Terra uses tokens over 3 times more efficiently than Claude Opus 5.5 at roughly one-quarter the price, translating to about 9x lower per-task cost; it completes tasks over 3 times faster than GPT-6 Astra and GPT-6.1 Sol.
- Quota note: OpenAI said the same usage quota in ChatGPT Work and Codex covers far more tasks than with GPT-5.6 Terra, and much more than with GPT-6.1 Sol or GPT-6 Astra.