GPT 6.1 Terra API Documentation

GPT 6.1 Terra is suited to interpreting product images and technical drawings, drafting text, and focused coding tasks. It is a separate model from GPT 5.6 Terra and GPT 6.1 Sol.

Model Information

Field	Description
Model ID	`gpt-6.1-terra`
Context window	1,050,000 tokens
Maximum output	128,000 tokens
Input	Text and images; no native audio or video input.
Output	Text, including structured output through compatible endpoints.

The sizes above are provider specifications. Effective limits, availability, pricing, Responses access, and hosted tools depend on the MixRoute route; model availability alone does not enable every upstream tool.

Reasoning and Tool Calling

Supported effort levels are none, low, medium (default), high, xhigh, and max. none disables reasoning; minimal is not a supported level for this model. Use top-level reasoning_effort in Chat Completions and nested reasoning.effort in Responses.

Tool calling requires Responses, even when reasoning is set to none. Do not attach tools or tool_choice to this model in Chat Completions. For tool workflows, use a route that supports Responses.

When effort is not none, omit temperature, top_p, and top_logprobs; also omit Chat Completions logprobs and Responses include: ["message.output_text.logprobs"].

Chat Completions Examples

Set MIXROUTE_API_KEY to your MixRoute API key. These examples use low effort without tools.

cURL
Python

curl "https://api.mixroute.ai/v1/chat/completions" \
  -H "Authorization: Bearer $MIXROUTE_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "gpt-6.1-terra",
    "messages": [{"role": "user", "content": "Draft a concise status update for a software project."}],
    "reasoning_effort": "low",
    "max_completion_tokens": 2048
  }'

import os
from openai import OpenAI

client = OpenAI(
    api_key=os.environ["MIXROUTE_API_KEY"],
    base_url="https://api.mixroute.ai/v1",
)
response = client.chat.completions.create(
    model="gpt-6.1-terra",
    messages=[{"role": "user", "content": "Draft a concise status update for a software project."}],
    reasoning_effort="low",
    max_completion_tokens=2048,
)
print(response.choices[0].message.content)

Request Fields

Parameter	Required	Description
`model`	Yes	Use `gpt-6.1-terra`.
`messages`	Yes	Conversation messages containing `role` and `content`.
`reasoning_effort`	No	none / low / medium / high / xhigh / max; default medium.
`max_completion_tokens`	No	Budget covering reasoning and visible output tokens, subject to the model and route limits.
`stream`	No	Set true for SSE streaming; use `choices[0].delta.content` for text chunks.

Responses Integration

On a MixRoute route with Responses support, use input, reasoning.effort, and max_output_tokens instead of the Chat Completions fields:

curl "https://api.mixroute.ai/v1/responses" \
  -H "Authorization: Bearer $MIXROUTE_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "gpt-6.1-terra",
    "input": "Draft a concise status update for a software project.",
    "reasoning": {"effort": "low"},
    "max_output_tokens": 2048,
    "store": false
  }'

Responses function tools use top-level name, description, and parameters, not a nested function object. Your application executes returned calls and sends function_call_output with the matching call_id. Preserve all returned output items required for the next turn, including reasoning items. Hosted computer-use and other tools need separate route support and application integration; changing the model ID alone does not enable them. Chat Completions reference · Responses reference

Home

Model Introduction

GPT 6.1 Terra

Model Information

Reasoning and Tool Calling

Chat Completions Examples

Request Fields

Responses Integration

​Model Information

​Reasoning and Tool Calling

​Chat Completions Examples

​Request Fields

​Responses Integration

Model Information

Reasoning and Tool Calling

Chat Completions Examples

Request Fields

Responses Integration