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OpenAI: GPT-5.2 Chat (AKA Instant)

OpenAI
Vision
128K
Context
$1.75
Input /1M
$14.00
Output /1M
16K
Max Output
Run API Call Open in Chat

OpenAI: GPT-5.2 Chat (AKA Instant)

Inference Model ID: openai/gpt-5.2-chat

Overview

Property Value
Provider OpenAI
Model ID openai/gpt-5.2-chat
Provider Model ID gpt-5.2-chat-latest
Created December 10, 2025
Context Length 128,000 tokens
Max Completion Tokens 16,384
Input Modalities File, Image, Text
Output Modalities Text

Description

GPT-5.2 Chat is the fast, lightweight member of the 5.2 family, optimized for low-latency chat while retaining strong general intelligence. The model uses adaptive reasoning to selectively engage deeper analysis on challenging queries, enhancing performance on mathematical, coding, and multi-step tasks without degrading typical conversation speed.

Key characteristics:

  • Adaptive Reasoning: Selectively thinks harder on more challenging queries
  • Improved Conversational Warmth: Better instruction adherence and stable short-form reasoning
  • High-Throughput Design: Suitable for interactive workloads where responsiveness and consistency matter more than deep deliberation
  • Lightweight Architecture: Optimized for low-latency responses

Pricing

Type Price
Input $1.75 per 1M tokens
Output $14.00 per 1M tokens
Cache Input $0.175 per 1M tokens

Supported Parameters

Parameter Description
seed Seed for reproducible outputs
max_tokens Maximum number of tokens to generate
response_format Format specification for the response
structured_outputs Enable structured output generation
tools List of tools available to the model
tool_choice Tool selection mode: none, auto, or required

Features

  • Implicit Caching: Automatic caching support for repeated requests
  • File URLs: Support for file URL inputs
  • Native Web Search: Built-in web search capability ($10 per 1,000 searches)
  • Tool Choice Parameters: Fine-grained control over tool usage

Performance

Recent Usage Statistics

Date Requests Prompt Tokens Completion Tokens
Dec 23, 2025 15,973 83.9M 5.7M
Dec 22, 2025 87,097 566.4M -
Dec 17, 2025 (Peak) 264,871 - -

Aggregate Usage

  • Total Prompt Tokens Processed: ~84 million (recent period)
  • Total Completion Tokens Generated: ~5.26 million (recent period)

API Usage Example

curl -X POST https://api.langmart.ai/v1/chat/completions \
  -H "Authorization: Bearer $LANGMART_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "openai/gpt-5.2-chat",
    "messages": [
      {"role": "user", "content": "Hello, how are you?"}
    ],
    "max_tokens": 1024
  }'

OpenAI Model Family

Model ID Description
openai/gpt-5 GPT-5 (August 2025) - Full capability model
openai/gpt-5-mini GPT-5 Mini (August 2025) - Smaller variant
openai/gpt-5.2 GPT-5.2 (December 2025) - Latest main release
openai/gpt-4o GPT-4o - Multimodal model
openai/gpt-4o-mini GPT-4o Mini - Lightweight multimodal
openai/gpt-4.1-mini GPT-4.1 Mini (April 2025)
openai/o4-mini O4 Mini (April 2025) - Reasoning model

Providers

Primary Provider: OpenAI

Property Value
Provider OpenAI
Provider Model ID gpt-5.2-chat-latest
Data Policy No training usage
Prompt Retention Yes (retains prompts)
User ID Required Yes

Notes

  • This model is part of OpenAI's GPT-5.2 family released in December 2025
  • Optimized for chat applications requiring quick responses
  • Supports multimodal inputs (text, images, files) but outputs text only
  • Uses adaptive reasoning to balance speed and quality based on query complexity

Source: LangMart Model Registry Last Updated: December 28, 2025