GPT-5.1-Codex

Approved Data Classifications

Description

GPT‑5.1 Codex is a coding-focused version of OpenAI’s GPT‑5.1 family tuned for agentic software engineering tasks in IDEs, terminals, and CLI workflows. It supports text and image input, outputs text, and keeps a 400K token context window for sustained coding sessions.

Capabilities

Model	Knowledge Cutoff	Input	Output	Context Length	Cost (per 1 million tokens)
gpt-5.1-codex	Sep 30 2024	Text, Image	Text	400,000	$1.25/1M input $10.00/1M output

info

• 1M represents 1 Million Tokens
• All prices listed are based on 1 Million Tokens

Availability

Cloud Provider

Usage

curl

curl -X POST https://api.ai.it.ufl.edu/v1/chat/completions \
-H "Content-Type: application/json" \
-H "Authorization: Bearer <API_TOKEN>" \
-d '{
    "model": "gpt-5.1-codex",
    "messages": [
        {
            "role": "system",
            "content": "You are a helpful assistant."
        },
        {
            "role": "user",
            "content": "Write a haiku about an Alligator."
        }
    ]
}'

python

from openai import OpenAI
  client = OpenAI(
      api_key="your_api_key",
      base_url="https://api.ai.it.ufl.edu/v1"
  )

  response = client.chat.completions.create(
      model="gpt-5.1-codex", # model to send to the proxy
      messages = [
          { role: "system", content: "You are a helpful assistant." },
          {
              "role": "user",
              "content": "Write a haiku about an Alligator."
          }
      ]
  )

  print(response.choices[0].message)

javascript

import OpenAI from 'openai';

const openai = new OpenAI({
apiKey: 'your_api_key',
baseURL: 'https://api.ai.it.ufl.edu/v1'
});

const completion = await openai.chat.completions.create({
model: "gpt-5.1-codex",
messages: [
{ role: "system", content: "You are a helpful assistant." },
{
role: "user",
content: "Write a haiku about an Alligator.",
},
],
});

print(completion.choices[0].message)

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References

1. OpenAI https://openai.com/
2. LLM Stats https://llm-stats.com
3. Artificial Analysis https://artificialanalysis.ai