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  "path": "/openai-launches-gpt-5-4-mini-and-gpt-5-4-nano-on-apis/",
  "publishedAt": "2026-03-18T01:17:07.000Z",
  "site": "https://www.testingcatalog.com",
  "tags": [
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  "textContent": "OpenAI introduces GPT-5.4 mini for faster, cost-efficient coding copilots, automation, and agent systems, now available in API, Codex, and ChatGPT. GPT-5.4 nano is now available via the API as well.",
  "title": "OpenAI launches GPT-5.4 mini and GPT-5.4 nano on APIs"
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