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GPT 5.3 Codex

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openai:gpt-5.3-codex

Added February 5, 2026

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);

Providers

Provider Model Context Output Input $/M Output $/M
OpenAI gpt-5.3-codex 400K 128K $1.75 $14.00
Internal gpt-5.3-codex 400K 128K $3.50 $28.00
Context/output in tokens. Prices in USD per 1M tokens.