GPT-5.6 Terra
OpenAI's mid tier — above the previous flagship on capability, below it on price.
GPT-5.6 Terra specifications
| Provider | OpenAI |
|---|---|
| Context window | 1,050,000 tokens (1.1M) |
| Input price | $2.00 / 1M tokens |
| Output price | $12.00 / 1M tokens |
| Inputs | Text, Images |
| Reasoning mode | Yes |
| Vision (image input) | Yes |
| Tool / function calling | Yes |
| Native real-time web | Yes |
| Open-weight | No |
| Released | July 2026 |
| Knowledge cutoff | February 2026 |
Pricing & context web-verified August 2026 — confirm on OpenAI's pricing page. Mid tier. Prompts over 272K input tokens bill at 2x input and 1.5x output for the whole request.
What GPT-5.6 Terra is best for
- Workloads balancing capability against cost
- High-volume production traffic that still needs reasoning
- Long-context tasks on a tighter budget
How to prompt GPT-5.6 Terra
- Reach for Terra first and escalate to Sol only when a task measurably fails — it clears GPT-5.5 on capability at a lower price.
- Same 1.05M window as Sol, so context strategy carries over unchanged.
- Use structured outputs to keep results machine-readable at volume.
Work with GPT-5.6 Terra
- Build an optimized prompt with the OpenAI prompt generator.
- Estimate cost with the token counter & cost calculator, or compare every model on the AI model comparison page.
- Related reading: Best Chatgpt Prompts 2026 · Choosing Right Ai Model Cost.
- Official: chatgpt.com
Frequently asked questions
What is GPT-5.6 Terra's context window?
GPT-5.6 Terra has a 1,050,000-token context window (about 1.1M tokens) — the maximum amount of text it can consider at once.
How much does GPT-5.6 Terra cost?
Via the OpenAI API, GPT-5.6 Terra costs $2.00 per 1M input tokens and $12.00 per 1M output tokens (web-verified August 2026). Output tokens cost more, so the length of the model's reply usually drives the bill.
Is GPT-5.6 Terra multimodal?
Yes — GPT-5.6 Terra accepts Text, Images as input, not just text.
Is GPT-5.6 Terra open-weight?
No — GPT-5.6 Terra is available only through the OpenAI API, not as downloadable weights.