# Grok 4 Grok 4 is the fourth-generation [[Grok]] model from [[xAI]], the umbrella for the Grok 4.x minor releases including [[Grok 4.3]]. It is xAI's frontier multimodal [[Large Language Models (LLMs)|LLM]] line as of 2026, succeeding Grok 3. ## Positioning - Closed-weight; hosted via X (`@grok`), grok.com, and the xAI API - Multimodal across text and image; voice transcription is the strongest standalone capability in the line - Headline competitor to [[Claude Opus 4.7]], [[GPT-5.4]], and [[Gemini 3]] - Distribution moat: native integration with the X platform — tweet/thread analysis as a first-class workflow ## Variants - [[Grok 4.3]] — May 2026 minor release; voice transcription accuracy, tone matching, token-density Other minor versions and specialty variants (fast / mini / reasoning tiers) follow xAI's evolving tiering convention; check https://docs.x.ai/ for the current list. ## Why it matters - Confirms xAI is shipping at frontier cadence; Grok 4 closed the gap with the established frontier labs - Voice transcription and X-distribution form the differentiated moat rather than raw reasoning depth - Keeps the 2026 LLM race a four-way contest (xAI, [[Anthropic]], [[OpenAI]], [[Google DeepMind]]) rather than two- or three-way ## Caveats - xAI has not published full model cards at the 4.x minor-version granularity for every variant - Comparison numbers come from community evaluations and competing-lab launches, not xAI's own benchmarks - Tiering, pricing, and context windows change faster than the version numbers; verify against the live docs ## References - xAI: https://x.ai/ - Grok docs: https://docs.x.ai/ ## Related - [[Grok]] - [[Grok 4.3]] - [[xAI]] - [[Elon Musk]] - [[Large Language Models (LLMs)]] - [[AI Frontier Model]] - [[AI Foundation Models]] - [[Claude Opus 4.7]] - [[GPT-5.4]] - [[Gemini 3]]