GPT-5.1-Codex

Model details

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GPT-5.1-Codex

Model
openai/gpt-5.1-codex
Provider
vercel-ai-gateway
API
anthropic-messages
Base URL
https://ai-gateway.vercel.sh
Input
text, image
Reasoning
Yes
Context window
400,000
Max tokens
128,000
Cost / million input
$1.25
Cost / million output
$10
Cost / million cache read
$0.125
Cost / million cache write
$0

Also available from other providers

Model config JSON
{
  "providers": {
    "vercel-ai-gateway": {
      "apiKey": "YOUR_API_KEY",
      "models": [
        {
          "id": "openai/gpt-5.1-codex",
          "name": "GPT-5.1-Codex",
          "reasoning": true,
          "input": [
            "text",
            "image"
          ],
          "contextWindow": 400000,
          "maxTokens": 128000,
          "cost": {
            "input": 1.25,
            "output": 10,
            "cacheRead": 0.125,
            "cacheWrite": 0
          }
        }
      ],
      "api": "anthropic-messages",
      "baseUrl": "https://ai-gateway.vercel.sh"
    }
  }
}