Overview
Grok 4.1 is xAI's post-training refinement of Grok 4, released in November 2025 after a quiet two-week rollout. It topped LMArena's text leaderboard at launch and ranked #1 on EQ-Bench3, with xAI reporting a 65% cut in hallucinations (from ~12% to ~4%). The headline theme is real-world usability: Grok 4.1 is more perceptive to nuanced intent, more compelling to talk to and noticeably more reliable than its predecessor.
Grok's signature edge remains live access to X and the broader web, plus a less-filtered personality that some users prefer for brainstorming and current-events questions. The Grok 4.1 Fast variant adds an Agent Tools API and a 2M-token context at aggressive pricing, making the family competitive for agentic and long-context work as well as conversation.
Key capabilities
- #1 on EQ-Bench3 for emotional intelligence
- ~65% fewer hallucinations than Grok 4
- Real-time access to X and the web
- Grok 4.1 Fast adds Agent Tools API + 2M context
At a glance
EQ-Bench3
#1 (1,586 Elo)
Hallucinations
~4.2% (down 65%)
LMArena
#1 at launch
Pricing: Competitive; Grok 4.1 Fast is notably cheap (~$0.20/$0.50).
Pros & cons
What we like
- Best-in-class emotional intelligence and conversation
- Live X/web access for current information
- Fast variant offers huge context at low cost
Trade-offs
- Less-filtered outputs aren't ideal for every use case
- Reasoning trails the very top frontier models on some tasks
The verdict
Grok 4.1 is the most usable Grok yet — engaging, emotionally intelligent and far less prone to making things up. Its real-time X access and cheap, long-context Fast variant make it a distinctive pick for conversation, current events and agentic work.
Best for: Conversational AI, current events and real-time web access.
Frequently asked questions
What's new in Grok 4.1 versus Grok 4?
Grok 4.1 is a post-training upgrade with much better emotional intelligence, ~65% fewer hallucinations and improved usability, while keeping Grok's real-time access to X.
What is Grok 4.1 Fast?
A speed-and-cost variant that adds an Agent Tools API and a 2M-token context window at low per-token pricing, aimed at agentic and long-context workloads.
