For 10,000 requests of 2,000 tokens in and 500 out, GPT-6.1 Terra costs 58% less than GPT-5.6 Terra on Zurelay: $11.25 against $27.10. Both are below their labs' list prices: 75% for GPT-6.1 Terra and 73% for GPT-5.6 Terra.
Side by side
| GPT-6.1 Terra | GPT-5.6 Terra | |
|---|---|---|
| Lab | OpenAI | OpenAI |
| Released | Oct 26, 2026 | Jul 9, 2026 |
| Context window | 1.05M tokens | 1.05M tokens |
| Max output | 128K tokens | 128K tokens |
| Reads | Text, Images, PDFs | Text, Images, PDFs |
| Reasoning levels | none, low, medium, high, xhigh, max | none, low, medium, high, xhigh, max |
| Price per 1M, in / out | $0.25 / $1.25 | $0.54 / $3.26 |
| Lab list price | $1.00 / $5.00 | $2.00 / $12.00 |
| Cached input per 1M | $0.0125 | $0.054 |
| 10K typical requests | $11.25 | $27.10 |
Prices in US dollars per 1M tokens on Zurelay, live from the catalog. A typical request is 2,000 tokens in and 500 out. Output limits are each lab's.
What they're for
GPT-6.1 Terra is OpenAI's mid-tier GPT-6.1 model, released on October 26, 2026, for computer use, visual reasoning, coding and everyday work. OpenAI says it performs on par with GPT-6 Astra at one-tenth of Astra's list price per token. The GPT-6.1 Terra API on Zurelay serves it through one OpenAI-compatible endpoint, below OpenAI's list price.
GPT-5.6 Terra is the middle tier of OpenAI's GPT-5.6 family, built to balance intelligence and cost. The GPT-5.6 Terra API on Zurelay runs the same model through one OpenAI-compatible endpoint, below OpenAI's list price. It fits production traffic that needs solid reasoning without paying for Sol.
Try both
Specs don't say which model handles your work better. Send the same requests to both and compare the answers, the tokens and the bill. On Zurelay that's a change of model name.
To price a whole month, use the LLM cost calculator.
from openai import OpenAIclient = OpenAI(base_url="https://api.zurelay.com/v1", api_key="YOUR_ZURELAY_KEY")prompt = [{"role": "user", "content": "Summarize this contract: ..."}]# Same key, same code: only the model name changesfor model in ["gpt-6.1-terra", "gpt-5.6-terra"]: reply = client.chat.completions.create(model=model, messages=prompt) print(model, reply.usage.total_tokens, reply.choices[0].message.content[:200])For 10,000 requests of 2,000 tokens in and 500 out, GPT-6.1 Terra costs 58% less than GPT-5.6 Terra on Zurelay: $11.25 against $27.10. Per 1M tokens, GPT-6.1 Terra is $0.25 input and $1.25 output, and GPT-5.6 Terra is $0.54 and $3.26.
They're the same on Zurelay: 1.05M tokens each.
Yes. One Zurelay key calls both. With an OpenAI SDK, point it at https://api.zurelay.com/v1 and change only the model name, gpt-6.1-terra or gpt-5.6-terra, to switch.
Yes. Each model is served over several routes run by independent sellers, and every route is tested before it serves requests and every day after, with identity, dated-knowledge and reasoning checks that catch an older or different model sold under the name you asked for.
Create a key in seconds, point the SDK you already use at Zurelay, and every request costs up to 90% less from the first token.