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Guides to xAI's Grok model lineup, so you can pick the right model and know its context window, pricing, and strengths. xAI offers several Grok models in 2026: Grok 4.5, Grok 4.3, Grok 4.20, Grok 4.1 Fast, Grok 4 Heavy. These 3+ guides cover the new Grok 4.5 (Opus-class, 500K context), Grok 4.3 (1M context), Grok 4.20 and Grok 4.1 Fast (2M context), Grok 4 Heavy for multi-agent tasks, and how they compare on price and capability. AI Toolbox (formerly ChatGPT Toolbox) adds search, folders, Smart Tags, and export to Grok on x.com/i/grok and grok.com, on top of any model, and is used by 40,000+ people across ChatGPT, Gemini, Claude, and Grok.
xAI's Grok lineup in 2026 is Grok 4.5, Grok 4.3, Grok 4.20, Grok 4.1 Fast, Grok 4 Heavy. The newest, Grok 4.5 (July 2026), is an Opus-class model with a 500K token context window; Grok 4.3 holds 1M, and Grok 4.20 and Grok 4.1 Fast hold 2M. Grok 5 has been reported in training. AI Toolbox works on top of whichever model you use.
Grok 4.20 and Grok 4.1 Fast both offer a 2M token context window, which is larger than the flagship Grok 4.3's 1M. Those are API maximums; the Grok web UI works with a smaller window, around 128K tokens on the free tier. Grok 4.1 Fast is also the cheap, high-throughput option, so the newest model is not always the largest-context one.
Yes. AI Toolbox operates at the browser level on x.com/i/grok and grok.com and is independent of which Grok model you select. It adds full-text search, folders, Smart Tags, a prompt library, a context window meter, and export on top of any Grok model.
Grok 4.5 (newest, Opus-class, 500K context) vs Grok 4.3 (1M context, video input, document generation). Compare specs, pricing, and which Grok model to use.
Adi Leviim
Every Grok pricing tier in 2026: the free tier, SuperGrok (~$30/mo), SuperGrok Heavy (~$300/mo), and xAI API costs per model. Which Grok plan to choose.
Adi Leviim
A plain-English guide to xAI's Grok model lineup in 2026: the new Grok 4.5 (Opus-class, 500K context), Grok 4.3 (1M), Grok 4.20 and 4.1 Fast (2M), Grok 4 Heavy, pricing, and which to use.
Adi Leviim