GPT-4.1 (Fast)

openai/gpt-4.1-fast

A chat model with a 1M-token context window, at $3.675 per million input tokens and $14.70 per million output tokens.

Details

Maker: openai
Kind: Chat
Context window: 1,047,576 tokens
Max output: 32,768 tokens
Input: $3.675 per million tokens
Cached input: $0.91875 per million tokens, 75% off
Cache write: Same as input
Output: $14.70 per million tokens
Capabilities: 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: 2025-04-14
Newer model: openai/gpt-6.1-solReleased later by the same maker, costs no more, and lists the same capabilities. Compare the two

Description

GPT 4.1 is OpenAI's flagship model for complex tasks. It is well suited for problem solving across domains.

Call it

curl

curl https://phantom.codes/v1/chat/completions \
  -H "Authorization: Bearer $PHANTOM_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "openai/gpt-4.1-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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