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OpenAI: GPT-5.3 Chat

openai/gpt-5.3-chat
Mar 3, 2026128K context16.4K max output$1.75/M in · $14.00/M out

Description

GPT-5.3 Chat is an update to ChatGPT's most-used model that makes everyday conversations smoother, more useful, and more directly helpful. It delivers more accurate answers with better contextualization and significantly reduces unnecessary refusals, caveats, and overly cautious phrasing that can interrupt conversational flow.

Specifications

Provider
openai
Context Length
128K
Max Output
16.4K
Modality
Intextimagefile
Outtext

Pricing

TypePrice / 1M tokens
Input$1.75
Output$14.00
Cache Read$0.17
Web Search$0.10 / call

Quick Start

curl https://api.ominigate.ai/v1/chat/completions \
  -H "Authorization: Bearer sk-omg-your-api-key" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "openai/gpt-5.3-chat",
    "messages": [{"role": "user", "content": "Hello!"}]
  }'
OpenAI: GPT-5.3 Chat — Pricing & API on OminiGate