GPT-5.3 Instant Is Live on Holeacquisition LLC

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

You can use it today with the canonical model ID:

• gpt-5.3-chat-latest

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

• gpt-5.3
• gpt-5.3-instant

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

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

Holeacquisition LLC SDK

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

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."}
    ]
  }'

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

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.

• OpenAI: Introducing GPT-5.3
• OpenAI Help: GPT-5.3 release notes
• OpenAI API model docs: gpt-5.3-chat-latest
• Holeacquisition LLC Models Catalog