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ChatGPT Models Explained: Complete Comparison Guide (2026)

Secondary article AI Toolbox
Published: 2026-01-06 Accessed: 2026-05-02
Original source ↗ Archived copy ↗

Summary

Comparison of 2026 ChatGPT models including GPT-5.3 Instant, GPT-5.4 Thinking, and GPT-5.4 Pro, detailing capabilities, pricing tiers, and context windows.

Key quotes

As of February 13, 2026, every active ChatGPT model belongs to the GPT-5 family.
GPT-5.3 Instant is ChatGPT's default model for every tier, including free users
GPT-5.4 Pro is the highest-capability ChatGPT model, built for the hardest tasks and long-running agentic workflows

The article provides a detailed breakdown of OpenAI’s model lineup in 2026, focusing on the transition to the GPT-5 family and the retirement of GPT-4 series models. It outlines a task-first decision framework for selecting between Instant, Thinking, and Pro models.