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OpenAI: GPT-5.2 Chat

GPT-5.2 Chat (AKA Instant) is the fast, lightweight member of the 5.2 family, optimized for low-latency chat while retaining strong general intelligence. $1.75 per million input tokens, $14 per million output tokens. 128,000 token context window, maximum output of 32,000 tokens.

View source on OpenRouter
Overview

Model specifications

Context
128,000 tokens
Maximum output
32,000 tokens
Architecture
text+image+file->text
Tokenizer
GPT
Knowledge cutoff
Not provided
Moderated
No
OPENROUTER

Complete pricing

Synchronized OpenRouter rates. Token prices are shown per one million tokens.

Input
$1.75
/M tokens
Output
$14
/M tokens
Cache read
$0.175
/M tokens
API

Quick start

Call this exact model ID through OpenRouter’s OpenAI-compatible API.

curl https://openrouter.ai/api/v1/chat/completions \
  -H "Authorization: Bearer $OPENROUTER_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model":"openai/gpt-5.2-chat","messages":[{"role":"user","content":"Hello!"}]}'
Capabilities

Input → Output

Input
fileimagetext
Output
text
API

Supported API parameters

max_completion_tokensresponse_formatseedstructured_outputstool_choicetools
Available providers

1 Provider

Live providers on OpenRouter

Provider availability, latency, throughput and routing can change continuously. Open the source page for current operational data.

OpenRouter

Azure

unknown
Context
128K
Maximum output
32K
Input
$1.75
Output
$14.00
Cache read
$0.175
Cache write
Not provided
openai

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OpenAI: GPT Transcribe

GPT Transcribe is a high-accuracy speech-to-text model from OpenAI. It is suited for recorded audio, streamed file transcription, and committed Realtime turns, with free-form context, keyword hints, and multiple language...

Context
Not provided
Input
audio
Output
transcription
Input: $4500.00Output: Freeper 1M tokens
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OpenAI: GPT-5.6 Luna Pro

GPT-5.6 Luna Pro is the same underlying model as GPT-5.6 Luna, served with reasoning.mode set to pro for higher-quality responses on complex tasks. Learn more in OpenAI's docs: https://developers.openai.com/api/docs/guides/reasoning#reasoning-mode

Context
1.1M
Input
file · image · text
Output
text
Input: $0.200Output: $1.20per 1M tokens
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OpenAI: GPT-5.6 Luna

GPT-5.6 Luna is a fast, cost-efficient model in OpenAI's GPT-5.6 series. It is suited for high-volume, latency-sensitive tasks such as chat, classification, and lightweight agentic workflows, providing capable reasoning for...

Context
1.1M
Input
file · image · text
Output
text
Input: $0.200Output: $1.20per 1M tokens
View model details →
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OpenAI: GPT-5.6 Terra Pro

GPT-5.6 Terra Pro is the same underlying model as GPT-5.6 Terra, served with reasoning.mode set to pro for higher-quality responses on complex tasks. Learn more in OpenAI's docs: https://developers.openai.com/api/docs/guides/reasoning#reasoning-mode

Context
1.1M
Input
file · image · text
Output
text
Input: $2.00Output: $12.00per 1M tokens
View model details →