GPT-5.3 Instant mini in ChatGPT

April 9, 2026

GPT-5.3 Instant mini in ChatGPT
Today, we’re releasing GPT-5.3 Instant Mini in ChatGPT. It replaces GPT-5 Instant Mini as the fallback model users reach after hitting their rate limits for GPT-5.3 Instant. Because it serves as a fallback, it won’t appear in the model picker.

Compared with GPT-5 Instant Mini, GPT-5.3 Instant Mini feels more natural in conversation, with stronger writing and contextual awareness throughout chats. It outperforms GPT-5 Instant Mini across a range of use cases.

New Pro plan options
We’re introducing a new $100/month Pro plan and updating how Codex usage works across Plus and Pro.

• Pro ($100/month): Built for longer, high-intensity Codex sessions. It includes unlimited access to GPT-5.4, access to GPT-5.4 Pro, and, for a limited time, up to 10x more Codex usage than Plus (up from 5X standard usage allowance).
• Pro ($200/month): Our highest-usage option remains available and continues on its current Codex promotion through May 31.
• Plus ($20/month): Plus remains best for steady, day-to-day use. As the temporary Codex promotion on Plus ends, we’re rebalancing Plus usage to support more sessions across the week, rather than longer, high-intensity sessions on a single day.

You can upgrade, switch, or cancel your plan from Settings > My Plan or from the Pricing page.