xAI: every model, side by side

SpaceXAI's Grok 4.6, aimed at coding, knowledge work and STEM. 500K-token context window, with text, image and file input, and reasoning enabled via the API.

xAI's Grok 4.5, aimed at coding, knowledge work and STEM. 500K-token context window, text and image in, reasoning enabled via the API.

Grok 4.3 is xAI's reasoning model with a 1M token context window. It accepts text and image inputs with text output, suited for agentic workflows, instruction-following tasks, and applications requiring high factual accuracy. Supports parallel tool calling, structured outputs, and exposed reasoning.

xAI's Grok 4.20 Beta, built for speed and agentic tool calling. xAI claims the lowest hallucination rate on the market and strict prompt adherence. Reasoning toggles on and off via the API.

A Grok 4.20 variant for agent-based workflows. Multiple agents run in parallel to research, coordinate tool use and synthesise across complex tasks. Reasoning effort sets agent count: low and medium use 4, high and xhigh use 16.

xAI's image generation model, pairing Grok's prompt understanding with high-quality output. Aimed at detailed, creative images that follow the prompt closely.

xAI's fast tier of Grok 4.1, shipped alongside the Agent Tools API for search and code execution. Sold on the xAI API and Oracle Cloud, in reasoning and non-reasoning variants.

Grok 4 Fast is xAI's latest multimodal model with SOTA cost-efficiency and a 2M token context window. It comes in two flavors: non-reasoning and reasoning. Reasoning can be enabled via the API.

xAI's cheap, fast coding model, built for agents that make many small edits in an editor rather than one long deliberation. 256K context, available through the xAI API and Azure AI Foundry.

Grok 4 is xAI's latest reasoning model with a 256k context window. It supports parallel tool calling, structured outputs, and both image and text inputs. Note that reasoning is not exposed, reasoning cannot be disabled, and the reasoning effort cannot be specified.

A small thinking model for reasoning-heavy work that does not need deep domain knowledge. Strongest on math and quantitative tasks. The thinking traces are visible.

xAI's top Grok 3 tier, aimed at data extraction, coding and summarization, with domain knowledge in finance, healthcare, law and science. Beats Grok 3 Mini on high-thinking tasks.

Grok 3 Thinking exposes the full chain-of-thought process during problem-solving, including error backtracking and alternative solution exploration. Scores 84.6% on GPQA Diamond benchmark for expert-level Q&A.

xAI's Grok 3, trained on the Colossus cluster, with a Big Brain Mode that spends extra compute on hard problems. Scored 1402 Elo on LMArena and 93.3% on AIME 2025.