GPT 5.3 Codex (Fast)
GPT-5.3-Codex advances both the frontier coding performance of GPT‑5.2-Codex and the reasoning and professional knowledge capabilities of GPT‑5.2, together in one model, which is also 25% faster. This enables it to take on long-running tasks that involve research, tool use, and complex execution. Your use is subject to OpenAI's Terms & Privacy Policies.
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import { streamText } from 'ai'
const result = streamText({ model: 'openai/gpt-5.3-codex-fast', prompt: 'Why is the sky blue?'})Copy link to headingProviders
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