ModelInfo
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GPT-5.1 Chat

GPT-5.1 model used in ChatGPT

OpenAIgpt-5.1-chat-latestReport incorrect data

Specs

Context
128K
Max output
16.4K
Input price
$1.25/ 1M tokens
Output price
$10/ 1M tokens
Released
—

Context

Context window
128K
Max input
272K
Max output
16.4K

Pricing · USD / 1M tokens

Input
$1.25
Output
$10
Cache read
$0.125
Cache write
—

Modalities

Input
TextImage
Output
Text

API

API types
chatresponses

Reasoning

Not published

Info

Status
Retired
Released
—
Knowledge cutoff
2024-09-30

Features

Confirmed
toolsstructured_outputstreaming
Source · official docsVerified 2026-10-11

How to call

1 provider

openaimodel = gpt-5.1-chat-latest

chat
POSThttps://api.openai.com/v1/chat/completions
responses
POSThttps://api.openai.com/v1/responses

JSON

Standard format
gpt-5.1-chat-latest.json
{
  "id": "gpt-5.1-chat-latest",
  "object": "model",
  "created": null,
  "owned_by": "openai",
  "name": "GPT-5.1 Chat",
  "api": {
    "types": [
      "chat",
      "responses"
    ]
  },
  "limits": {
    "context": 128000,
    "input": 272000,
    "output": 16384
  },
  "modalities": {
    "input": [
      "text",
      "image"
    ],
    "output": [
      "text"
    ]
  },
  "reasoning": {
    "supported": null,
    "efforts": []
  },
  "pricing": {
    "currency": "USD",
    "unit": "1M_tokens",
    "input": 1.25,
    "output": 10,
    "cache_read": 0.125,
    "cache_write": null
  },
  "features": [
    "tools",
    "structured_output",
    "streaming"
  ],
  "info": {
    "status": "retired",
    "release_date": null,
    "knowledge_cutoff": "2024-09-30",
    "description": "GPT-5.1 model used in ChatGPT",
    "docs": "https://developers.openai.com/api/docs/models/gpt-5.1-chat-latest",
    "verified_at": "2026-10-11"
  }
}

Official sources

2