Grok
by xAI
Generative AI chatbot with state-of-the-art reasoning, multimodal capabilities, and real-time X/web search integration, holding #1 position on LMArena with 1483 Elo
See https://x.ai
Features
Latest Models (2025):
- Grok 4.1: Most capable model with improved reasoning, multimodal understanding, and emotional intelligence
- Grok 4.1 Fast: Optimized for tool-calling and agentic workflows with 2M token context window
- Grok 4.1 Thinking: Reasoning mode variant scoring 1722 Elo on creative writing (600 points above previous best)
Reasoning & Performance:
- #1 overall position in LMArena Text Arena with 1483 Elo (31-point lead over highest non-xAI model)
- 65% hallucination reduction (from 12.09% to 4.22%)
- FActScore improves from 9.89% to 2.97% across 500 biography questions
- Preferred 64.78% of the time over previous production model
- Tops EQ-Bench3 for empathy, insight, and interpersonal skills
Multimodal Capabilities:
- Text, vision, and image generation support
- Real-time camera integration (“Grok can see what you see”)
- Aurora image generation with photorealistic capabilities
- Grok Imagine for six-second animated audiovisual clips from text prompts
- Enhanced Voice Mode with realistic, responsive, serene voice
Tool Usage & Agentic Features:
- Trained with reinforcement learning for tool use
- Code interpreter and web browsing capabilities
- Agent Tools API with real-time X data access, web search, remote code execution
- Two modes: low-latency non-reasoning for instant replies, reasoning mode for multi-step tasks
- 2M token context window (Grok 4.1 Fast and Grok 4 Fast)
Safety & Robustness:
- 0.00% false negatives in restricted chemistry filters
- 0.03% false negatives in biology filters
- 0% attacker success in MakeMeSay persuasion tests
- Advanced alignment through frontier agentic reasoning models as reward models
Superpowers
Grok stands out with real-time X integration and truth-seeking personality, making it ideal for:
- Developers building AI agents requiring tool-calling, web search, and real-time social data access
- Content creators needing multimodal generation (text, images, video clips) with few creative restrictions
- Researchers requiring strong reasoning with reduced hallucinations and factual accuracy
- Customer support teams leveraging agentic capabilities for complex real-world scenarios
- X Premium users seeking integrated AI assistance within social platform workflows
Real-world applications:
- Customer support automation with agentic reasoning
- Financial analysis with real-time web and X data
- Creative content generation (images, animations, voice)
- Code development with interpreter access
- Research tasks with improved factuality and citation accuracy
Key advantages:
- Best-in-class reasoning performance (LMArena #1)
- 65% hallucination reduction for enterprise reliability
- Unified reasoning/non-reasoning architecture in single model
- Real-time X platform integration for social insights
- Competitive API pricing ($0.20 per 1M input tokens)
Pricing
Consumer Tiers (via X):
- X Premium: $8/month - Grok access within X platform
- X Premium+: $40/month - Priority responses and higher usage limits
- SuperGrok: $30/month - Increased Grok 4.1 and Grok 3 access with 128K token memory
- SuperGrok Heavy: $300/month - Maximum access tier
API Pricing:
- Input: 0.05 cached)
- Output: $0.50 per 1M tokens
- Tool usage: $5 per 1,000 calls
- Available for
grok-4-1-fast-reasoningandgrok-4-1-fast-non-reasoning
Platform Access:
- iOS and Android apps
- X platform integration
- API access for developers
Model Variants
Grok 4.1 (November 2025):
- Flagship model with best reasoning and multimodal performance
- Tops LMArena with 1483 Elo
- 65% hallucination reduction
Grok 4.1 Fast:
- Best tool-calling model with 2M context window
- Dual-mode: reasoning and non-reasoning
- Optimized for agentic workflows
Grok 4 Fast:
- Cost-efficient variant
- Web and X search capabilities
- 2M token context window
Future: Grok 5 (January 2026):
- Slated for 6 trillion parameters
- AGI research focus
Integration & Ecosystem
Platforms:
- X (Twitter) native integration
- Tesla Optimus robot integration
- iOS/Android mobile apps
- Web interface
Development:
- Agent Tools API for custom workflows
- Real-time X data access
- Web search and code execution
- Voice and vision APIs
Sources
- Grok (chatbot) - Wikipedia
- Grok AI Models 2025: Your Guide to xAI’s Truth-Seeking Assistant
- Grok 4.1 Fast: Independent Reviews And Benchmarks
- xAI Launches Grok 4.1 With Faster Reasoning and Low Costs
- Grok 4 by xAI - Performance Analysis & Benchmarks