GPT-6.1 Terra (Fast)

openai/gpt-6.1-terra-fast

A chat model with a 1.1M-token context window, at $2.10 per million input tokens and $10.50 per million output tokens.

Details

Maker: openai
Kind: Chat
Context window: 1,050,000 tokens
Max output: 128,000 tokens
Input: $2.10 per million tokens
Cached input: $0.105 per million tokens, 95% off
Cache write: $2.625 per million tokens
Output: $10.50 per million tokens
Capabilities: Reasoning, tool use, vision, file input, web search, fast
Takes: Text, image, pdf
Returns: Text
Zero data retention: Yes, on every provider
No training on requests: Yes, on every provider
Released: 2026-10-26

Description

GPT-6.1 Terra is OpenAI’s model for visual reasoning, precise computer use, and natural writing. It accepts text and images and generates text, with configurable reasoning effort, structured outputs, tool calling through the Responses API, and implicit and explicit prompt caching.

Call it

curl

curl https://phantom.codes/v1/chat/completions \
  -H "Authorization: Bearer $PHANTOM_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "openai/gpt-6.1-terra-fast",
    "messages": [
      {"role": "user", "content": "Hello"}
    ]
  }'

Set PHANTOM_KEY to your key. Any OpenAI client works with the base URL https://phantom.codes/v1.

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