OpenAI

OpenAI: GPT-5.3 Chat (Latest)

stable

GPT-5.3 Chat (Latest) is available through Everstack's OpenAI-compatible gateway with routing, fallback, retries, and observability.

gpt-5.3-chat-latestgpt-5released Mar 3, 2026
ProviderQuick start
Context
128K
tokens
Max output
16.4K
tokens
Input
$1.75
per 1M
Output
$14.00
per 1M

Activity

Daily period usage
Aggregated managed Everstack traffic. Buckets below 5 tenants or 100 requests are withheld.

Providers

ProviderContextInput /MOutput /M
OpenAI
OpenAI
128K$1.75$14.00

Pricing

ItemPriceUnit
Input$1.75per 1M tokens
Output$14.00per 1M tokens
Cache read$0.17per 1M tokens

Performance

Reliability

Compare

Compare usage and performance
Place this model beside up to three other catalog models.

Capabilities

Capabilities
Modalities
Input
Output
Details
Model ID
gpt-5.3-chat-latest
Family
gpt-5
Status
stable
Knowledge
-
Released
Mar 3, 2026
Gateway Config
API
2024-01-01
Auth
OPENAI_API_KEY
Discovery
static
Provider type
static

Quick Start

index.ts
import Everstack from "@everstack/node";const client = new Everstack({  apiKey: process.env.EVERSTACK_API_KEY!,  baseUrl: "https://{instance}.{region}.everstack.ai",});const completion = await client.chat.completions.create({  model: "@openai/gpt-5.3-chat-latest",  messages: [{ role: "user", content: "Explain vector cache routing." }],});console.log(completion.choices[0]?.message?.content);

Endpoint

Base URL
https://api.openai.com/v1
Chat completions
https://api.openai.com/v1/chat/completions
Model
gpt-5.3-chat-latest
Auth env
OPENAI_API_KEY

GPT-5.3 Chat (Latest) FAQ

How much does the GPT-5.3 Chat (Latest) API cost?

Through OpenAI, GPT-5.3 Chat (Latest) costs $1.75 per 1M input tokens and $14.00 per 1M output tokens.

What is the context window of GPT-5.3 Chat (Latest)?

GPT-5.3 Chat (Latest) accepts up to 128K tokens of context and returns up to 16.4K output tokens on OpenAI.

What can GPT-5.3 Chat (Latest) do?

GPT-5.3 Chat (Latest) supports chat, function calling and image input. It accepts text and image input.

How do I call GPT-5.3 Chat (Latest) through Everstack?

Point any OpenAI-compatible SDK at your Everstack gateway and set the model to @openai/gpt-5.3-chat-latest. Everstack adds retries, provider fallback, caching, per-tenant budgets and OpenTelemetry traces for every request.