Grok
xAI's family, served through the xAI API.
At a glance
Current release
From the release row Grok 4.6. Up to 200K tokens in us-east-1; longer requests $4.00 / $12.00, us-central-1 $2.20 / $6.60; a fast variant costs double. xAI's docs now also list Grok 4.7.
Family record: Press release · 5 Sep 2026
Built on it
1 product in this catalogue names this family on their own pages.
Releases
-
Grok-1
First Grok, with real-time knowledge via X; xAI reported 73% MMLU and 63.2% HumanEval and said it surpassed ChatGPT-3.5 in its compute class, after a 33B Grok-0 prototype.
-
Grok-1 (open release)
Base-model weights and architecture of Grok-1 released under Apache 2.0: a 314B-parameter mixture-of-experts with 25% of weights active per token, not fine-tuned for dialogue.
-
Grok-1.5
128K-token context, a 16x increase, with xAI reporting 50.6% on MATH, 90% on GSM8K and 74.1% on HumanEval.
-
Grok-1.5V
xAI's 'first-generation multimodal model', reading documents, diagrams, charts, screenshots and photos, introduced with the RealWorldQA benchmark.
-
Grok-2
Grok-2 and Grok-2 mini in beta, text and vision, with xAI citing 56.0% GPQA, 76.1% MATH and 88.4% HumanEval; image generation via Black Forest Labs' FLUX.1 on X.
-
Grok 3
Grok 3 and Grok 3 mini plus a reasoning mode, Grok 3 (Think), and the DeepSearch agent; xAI claimed a 1M-token context and 93.3% on AIME 2025 for Think.
-
Grok 4
Native tool use and real-time search, 256K API context, with Grok 4 Heavy using parallel test-time compute; xAI claimed 50.7% on Humanity's Last Exam.
-
Grok 4 Fast
Cost-efficient model uniting reasoning and non-reasoning modes with a 2M-token context; xAI claimed Grok 4-level benchmark results at a 98% lower price.
-
Grok 4.1
Grok 4.1 Thinking and a non-reasoning mode, with xAI citing #1 and #2 on LMArena, better emotional intelligence and creative writing, and a lower hallucination rate.
-
Grok 4.20
Grok 4.20 in reasoning and non-reasoning forms plus Grok 4.20 Multi-agent, listed in the API docs with a 1M-token context.
-
Grok 4.5
Built for coding, agentic tasks and knowledge work with Cursor; xAI claimed 62.0% on DeepSWE 1.0 at 80 tokens per second, priced $2/$6 per million tokens.
-
Grok 4.6
Aimed at long-running agents and interactive and visual work; xAI said it matches GPT-5.6 Sol on the Artificial Analysis Intelligence Index; a fast variant costs double.