GPT-6.1 Terra reaches OpenAI's API at $1 input, $5 output
A 1.05M-token context, text and image input, and half GPT-5.6 Terra's input price.
OpenAI released GPT-6.1 Terra in its API as gpt-6.1-terra on October 26, 2026. Standard pricing is $1 per million input tokens, $0.05 per million cached input tokens and $5 per million output tokens.
What changed
- Model ID
gpt-6.1-terra, with text and image input and text output. - A 1,050,000-token context window, 922,000 maximum input tokens and 128,000 maximum output tokens. Knowledge cutoff is June 1, 2026.
- Prompts over 272K input tokens are billed at 2x input and cache rates and 1.5x output for the whole request. Batch and Flex are 50% lower; regional processing adds 10%.
- Tool calling requires the Responses API. Chat Completions and Batch are supported.
- OpenAI says the model does not support UAE inference residency.
Pricing
Prices per million tokens. GPT-6.1 Terra is OpenAI's list price; the other rows are from the live RouterPlus catalog on October 31, 2026, provider OpenAI (direct API):
| Model | Source | Input | Cached input | Output |
|---|---|---|---|---|
gpt-6.1-terra | OpenAI list price | $1.00 | $0.05 | $5.00 |
gpt-5.6-terra | RouterPlus catalog | $2.00 | $0.20 | $12.00 |
gpt-6.1-sol | RouterPlus catalog | $2.00 | $0.10 | $10.00 |
gpt-6-luna | RouterPlus catalog | $0.10 | $0.01 | $0.50 |
gpt-6.1-terra is not in the RouterPlus catalog as of October 31, 2026.
What it means
At list price, GPT-6.1 Terra halves GPT-5.6 Terra's input price and cuts output by about 58%. Long prompts cost more: past 272K input tokens the whole request is billed at the higher rate, so check where your prompt sizes land.
What to do
- "model": "gpt-5.6-terra"
+ "model": "gpt-6.1-terra"Run your evals before swapping, and move tool-calling code to the Responses API.
Browse every model and price: RouterPlus models.