xAI released Grok 4.1 on November 17, 2025. This update builds on Grok 4, introducing refinements in speed, accuracy, and performance. While there is ongoing discussion about Grok 5, this post focuses on the details of Grok 4.1.
Gold and silver medal for Grok https://t.co/fMsKtbRjWV
— Elon Musk (@elonmusk) December 4, 2025
What Is Grok 4.1?
Grok 4.1 emphasizes practical improvements, including faster processing and more reliable outputs. Key features include:
- Speed and Efficiency: It processes queries more quickly, making it suitable for real-time applications. The Grok 4.1 Fast variant is designed for in-depth tasks and is available for free on OpenRouter for a limited period.
- Accuracy Improvements: Updates reduce inaccuracies in responses. Benchmarks show competitive performance in text generation and user preference tests compared to models like GPT-5.1 and Claude 4.5.
- Reasoning and Capabilities: Enhancements support stronger logical reasoning, creativity, and contextual understanding. It integrates with tools for real-time information retrieval, web browsing, and code execution via the Agent Tools API.
- Context Window and Integration: A 2 million-token context window enables handling of extended interactions. It also incorporates live data from X for up-to-date information.
The model is accessible on grok.com, x.com, and the Grok iOS and Android apps. API pricing begins at $0.2 per million tokens.
Performance Comparison
Benchmarks indicate that Grok 4.1 performs well in areas such as reasoning and creative tasks. This aligns with xAI’s focus on developing practical, curiosity-driven AI.
For users, this results in more consistent responses across a variety of applications, from general inquiries to technical workflows.
| Model | Text Generation Score | Human Preference Test (%) | Agentic Workflows Efficiency |
|---|---|---|---|
| Grok 4.1 | 92/100 | 85% | High |
| GPT-5.1 | 88/100 | 82% | Medium |
| Claude 4.5 | 89/100 | 80% | Medium-High |
Grok 4.1 has a massive 2-million-token context window that can fit entire codebases, long conversations, and entire documents. It's the only frontier model with such a large context window
— X Freeze (@XFreeze) December 3, 2025
It was trained using long-horizon reinforcement learning with strong emphasis on… pic.twitter.com/0v3zvzMItW
Update on Grok 5
Elon Musk has adjusted the timeline for Grok 5 from the end of 2025 to Q1 2026. It is expected to feature approximately 6 trillion parameters, along with capabilities like multimodal processing (video, audio, images, text) and integrations with X, Tesla, and SpaceX data.
Musk has estimated a 10% probability (potentially increasing) of it achieving capabilities akin to AGI. Training is progressing on xAI’s GPU clusters, with development reported as on track.