OpenAI ChatGPT Update Version GPT-5.3 Instant Mini

April 9, 2026 release of GPT-5.3 Instant Mini in ChatGPT. It replaces GPT-5 Instant Mini as the fallback model and introduces new Pro plan options with updated Codex usage limits.

• GPT-5.3 Instant Mini replaces GPT-5 Instant Mini as the fallback model after GPT-5.3 Instant rate limits are reached.
• New $100/month Pro plan includes unlimited access to GPT-5.4, access to GPT-5.4 Pro, and up to 10x more Codex usage than Plus for a limited time.
• Plus plan usage is being rebalanced to support more sessions across the week rather than longer single-day sessions.

• GPT-5.3 Instant Mini does not appear in the model picker because it is a fallback model.
• Users can upgrade, switch, or cancel plans from Settings > My Plan or the Pricing page.
• The $200/month Pro plan remains available and continues its Codex promotion through May 31.

Product Information

Vendor: OpenAI

Product: ChatGPT

Product type: Other

Application category: Business

Platform: Web

Version: GPT-5.3 Instant Mini

Vendor release date: Apr 9, 2026

Published on updatealert.io: Jun 2, 2026

Description: AI assistant for writing, coding, analysis, and productivity.