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OpenAI offers multiple ChatGPT models in 2026: GPT-5.5, GPT-5.5 pro, GPT-5.4, GPT-5.4 pro, GPT-5.4 mini, GPT-5.4 nano, GPT-5 mini, GPT-5 nano, GPT-5, GPT-4.1. Each model differs in reasoning ability, speed, context window, and pricing. These guides compare all available ChatGPT models with benchmarks, use-case recommendations, and pricing breakdowns. AI Toolbox (formerly ChatGPT Toolbox), a Chrome extension with 20,000+ users, works with every ChatGPT model and adds folders, search, and export to organize your conversations.
OpenAI offers GPT-5.5, GPT-5.5 pro, GPT-5.4, GPT-5.4 pro, GPT-5.4 mini, GPT-5.4 nano, GPT-5 mini, GPT-5 nano, GPT-5, GPT-4.1 in 2026. Older models (GPT-4o, o3, o4-mini, and earlier) were retired on February 13, 2026 and replaced by the GPT-5.x family. Free users get a default everyday model, while Plus and Pro subscribers access the full lineup including the GPT-5.5 pro and GPT-5.4 pro reasoning-grade variants.
The best ChatGPT model depends on your task. GPT-5.5 pro and GPT-5.4 pro are designed for the most demanding reasoning workloads, GPT-5.5 and GPT-5.4 offer the best balance of speed and intelligence, and GPT-5.4 mini, GPT-5.4 nano, GPT-5 mini, and GPT-5 nano are ideal for quick everyday tasks. AI Toolbox (20,000+ users) works with all models and helps you organize conversations by model type using folders.
GPT-5.5 is OpenAI's most capable current ChatGPT model. GPT-5.4 sits one tier below and ships with pro, mini, and nano variants. The pro variants of either model use more compute per response for harder reasoning, coding, and math tasks. The mini and nano variants prioritize speed and cost.
A historical look at OpenAI's ChatGPT o3-mini, retired in early 2026. Covers its reasoning, STEM optimization, faster responses, and cost efficiency, and how the current GPT-5.4 mini and GPT-5 mini variants now occupy this tier.
Adi Leviim
A historical comparison of ChatGPT 4 against the free tier. GPT-4 was retired in 2026 and replaced by the GPT-5.x family. Use this guide to understand how OpenAI's tiered model lineup has evolved.
Adi Leviim