OpenAI announced GPT-5.3 Instant on March 3, 2026, and it is now available on Cencori.

You can use it today with the canonical model ID:

gpt-5.3-chat-latest

For compatibility, Cencori also accepts these aliases and normalizes them automatically:

gpt-5.3
gpt-5.3-instant

Why This Update Matters

GPT-5.3 Instant gives teams access to OpenAI's newest GPT-5.3 line while keeping the same Cencori gateway workflow you already use for logging, security, and model routing.

No API migration is required. If you already call Cencori chat endpoints, switch the model ID and go.

Use It Now

Cencori SDK

Codetext

import { Cencori } from 'cencori';
 
const cencori = new Cencori({ apiKey: process.env.CENCORI_API_KEY });
 
const response = await cencori.ai.chat({
  model: 'gpt-5.3-chat-latest',
  messages: [
    { role: 'system', content: 'You are a senior engineer.' },
    { role: 'user', content: 'Review this API design and suggest improvements.' }
  ]
});
 
console.log(response.content);

HTTP API

Codetext

curl -X POST https://cencori.com/api/ai/chat \
  -H "CENCORI_API_KEY: $CENCORI_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "gpt-5.3-chat-latest",
    "messages": [
      {"role": "user", "content": "Summarize the tradeoffs of this architecture."}
    ]
  }'

What We Shipped in Cencori

This rollout is live across the platform:

model catalog and /api/v1/models
OpenAI-compatible routing normalization for GPT-5.3 aliases
fallback mapping for cross-provider failover
dashboard model pickers (Playground and Logs)
docs and examples updated

Notes for Production Teams

gpt-5.3-chat-latest is a latest-channel model ID. If you require strict model pinning behavior for long-running evaluations, keep a pinned fallback model in your rollout plan.

GPT-5.3 Instant Is Live on Cencori