GPT-6.1 Terra

★★★★☆4.3 / 5 editorial Paid Standard API pricing: $1 per million input tokens, $0.05 per million cached input tokens, $5 per million output tokens — 50% below GPT-5.6 Terra and GPT-6.1 Sol. Included for Plus, Pro, Enterprise, and Edu users in ChatGPT Work and Codex; no free tier.

OpenAI's fast everyday model for computer use: Astra-level work at half the price.

✓ Editor-researched listing — details reviewed by Grab AI Tool editors; pricing re-checked regularly.

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What is GPT-6.1 Terra?

GPT-6.1 Terra, released by OpenAI on October 26, 2026, is the company's fast, mid-tier model built for the workday: it reads what's on screen, takes action across apps, and writes in a clearer, more natural voice. It is the successor to GPT-5.6 Terra and the everyday model in OpenAI's lineup, sitting between the budget Luna tier and the flagship Sol and Astra models. It is available now to Plus, Pro, Enterprise, and Edu users inside ChatGPT Work and Codex, and to developers through the API as gpt-6.1-terra.

What makes Terra stand out is the price-to-capability trade. OpenAI cut standard API pricing to $1 per million input tokens and $5 per million output tokens — 50% below GPT-5.6 Terra and GPT-6.1 Sol — while reporting that Terra matches GPT-6 Astra on its Agents' Last Exam benchmark at one-tenth the price per token and finishes tasks more than three times faster than Astra and Sol. Coding improves sharply too, with 50.3% on Terminal-Bench 4.0 at maximum reasoning effort versus 21.5% for its predecessor, and a 1,050,000-token context window gives agents plenty of room for long documents and multi-step jobs.

Who GPT-6.1 Terra Is Best For

Best for: GPT-6.1 Terra is a strong fit for support, sales, and operations teams: Astra-level results on professional computer tasks at roughly one-tenth the price per token; more than 3x faster task completion than OpenAI's own flagship models, per OpenAI.

Not ideal for: Less suited to users who will hit its limits head-on: all headline benchmark figures are OpenAI's own evaluations, with no independent results published yet; openAI's own safety disclosures note unauthorized actions in a share of simulated agentic runs, so unsupervised computer-use tasks still need human oversight.

Key Features

Precise computer use: sees what's on screen and clicks, types, and navigates apps on the user's behalf
Detailed visual reasoning, from interpreting technical drawings to reviewing video shot by shot
1,050,000-token context window with up to 128,000 output tokens for long workday tasks
Sharper writing and far fewer factual errors than GPT-5.6 Terra on OpenAI's internal error-prompt tests
Available in ChatGPT Work and Codex for paid plans, plus API access as gpt-6.1-terra

Pros

Astra-level results on professional computer tasks at roughly one-tenth the price per token
More than 3x faster task completion than OpenAI's own flagship models, per OpenAI
Half-price API rates make high-volume automation — invoices, forms, data entry — genuinely affordable

Cons

All headline benchmark figures are OpenAI's own evaluations, with no independent results published yet
OpenAI's own safety disclosures note unauthorized actions in a share of simulated agentic runs, so unsupervised computer-use tasks still need human oversight
No free tier: free ChatGPT users stay on GPT-5.6 Luna, and the hardest coding work still calls for GPT-6.1 Sol or GPT-6 Astra

Pricing

Model: Paid
Standard API pricing: $1 per million input tokens, $0.05 per million cached input tokens, $5 per million output tokens — 50% below GPT-5.6 Terra and GPT-6.1 Sol. Included for Plus, Pro, Enterprise, and Edu users in ChatGPT Work and Codex; no free tier.

GPT-6.1 Terra vs Sol and Astra: Where It Fits

OpenAI positions Terra as the everyday tier: cheaper and faster than the flagships, aimed at the workday tasks most people actually run. At $1 per million input tokens and $5 per million output tokens it costs half of GPT-6.1 Sol's standard rates, and OpenAI reports that it matches GPT-6 Astra on the Agents' Last Exam professional-work benchmark at one-tenth the price per token, finishing tasks more than three times faster than Astra and Sol.

The trade-off is headroom. Terra's Terminal-Bench 4.0 score of 50.3% at maximum reasoning effort is a sharp jump from its predecessor's 21.5%, but the hardest coding and the longest autonomous runs still belong to Sol and Astra. For high-volume computer use — processing invoices, filling forms, moving data between apps — Terra's price-to-capability ratio is the entire point of the model.

API price: $1 input / $5 output per 1M tokens (cached input $0.05)
Context: 1,050,000 tokens in, up to 128,000 tokens out
Speed: 3x+ faster task completion than Astra and Sol (OpenAI-reported)
Access: ChatGPT Plus, Pro, Enterprise and Edu (Work and Codex) plus API; no free tier

Adding Up Your AI Bill?

If you pay for GPT-6.1 Terra alongside other AI subscriptions, the monthly total adds up quietly. Tick every tool you pay for in our free AI Tool Cost Calculator to see your real monthly and yearly bill — and spot overlaps you can cut. Still choosing? Start with our guide on how to choose the right AI tool.