GPT-5.1 Chat

GPT-5.1 Chat: a gpt-codex model from OpenAI, ~128K context, knowledge cutoff 2024-09-30

Published

scheduleReleased：November 13, 2025

GPT-5.1 Chat is a gpt-codex model from OpenAI (~128K context, input around $1.25/1M tokens). Suitable for assistants, content generation, knowledge Q&A and business automation

descriptionOverview

Overview

GPT-5.1 Chat is provided by OpenAI, model ID gpt-5.1-chat-latest

Key specs

Context: 128K tokens
Max output: 16.4K tokens
Knowledge cutoff: 2024-09-30
Input price: $1.25/1M
Output price: $10/1M

Best for

Consider GPT-5.1 Chat when comparing context length, pricing, multimodal support and relay availability

lightbulbUse cases

Image and multimodal Q&A
Visual content analysis
Document and screenshot understanding

thumb_upStrengths

Large context window (~128K)
Supports image and multimodal input

infoLimitations

Knowledge cutoff 2024-09-30; newer facts need external retrieval
Pricing and availability vary by upstream and relay; verify with official docs and tests

linkReferences

open_in_newhttps://platform.openai.com/docs/models