# GPT-6.1 Terra Flex

Canonical: https://freepi.ai/models/gpt-6.1-terra-flex

Use GPT-6.1 Terra Flex free in free-pi: run `npx free-pi-cli@latest`, then `/model gpt-6.1-terra-flex`.

Usage in free-pi: slower · \~20x usage

## Stats

- Maker: OpenAI
- Intelligence index: 51
- Context window: 1,050,000 tokens
- Max output: 128,000 tokens
- Inputs: Text, image, file
- Tool calling: Yes
- Reasoning effort: Yes
- Structured output: Yes
- Released: Oct 26, 2026

Stats refreshed automatically.

## About GPT-6.1 Terra Flex

GPT-6.1 Terra Flex is the same model as [GPT-6.1 Terra](https://freepi.ai/models/gpt-6.1-terra), served on OpenAI's flex tier, which is slower and cheaper. The model is unchanged: the same 1,050,000-token context window and the same reasoning, tool calling, and structured output support.

Responses are slower on the flex tier, and the model uses less of your daily allowance. Its usage rate is shown above. It is still free with no API key and no card.

## When to pick it

For GPT-6.1 Terra's quality on work that is not urgent, such as a large refactor or a long investigation, pick GPT-6.1 Terra Flex. For faster responses, pick the regular [GPT-6.1 Terra](https://freepi.ai/models/gpt-6.1-terra).