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GPT 5.3 Codex is OpenAI's current state of the art coding model excelling in agentic workflows. It is currently best in the world at SWEBench Pro.
Usage
import OpenAI from "openai";
const client = new OpenAI({
baseURL: "https://api.tributary.cc/openai/v1",
apiKey: "<TRIBUTARY_API_KEY>",
});
const completion = await client.chat.completions.create({
model: "openai:gpt-5.3-codex",
messages: [
{ role: "user", content: "Hello!" }
],
});
console.log(completion.choices[0].message.content);