**Next Article: Grok 4 Fast Arrives as Cheaper Alternative to xAI’s Grok-4**
*By Dwaipayan Roy | Sep 20, 2025, 06:46 PM*

Elon Musk’s artificial intelligence (AI) company, xAI, has introduced a new model called **Grok 4 Fast**. This innovative system offers a more affordable version of the existing Grok 4, designed to cater to both enterprise and consumer use cases.

### A Unique and Efficient Framework

What sets Grok 4 Fast apart is its ability to perform both reasoning and non-reasoning tasks within a single framework. This integration makes the model highly efficient, reducing latency and operational costs significantly compared to its predecessors.

### Cost Efficiency and Performance

Grok 4 Fast delivers a superior cost-to-performance ratio. It utilizes approximately **40% fewer “thinking tokens”** than Grok 4 while maintaining similar accuracy on various benchmark tests. An independent review by Artificial Analysis highlighted that Grok 4 Fast can achieve comparable results to Grok 4 at up to **98% lower spending**.

### Benchmark Results

The model has demonstrated impressive performance across multiple benchmarks:
– **85.7%** on GPQA Diamond
– **92%** on AIME 2025
– **93.3%** on HMMT 2025

These scores closely match those of Grok 4. Additionally, Grok 4 Fast excelled in code execution and search-based benchmarks, with a pass rate of up to **95% on SimpleQA** and a solid **74% on X Bench Deepsearch**.

### Key Features of Grok 4 Fast

– **Two Million Token Context Window**: Enables processing of large inputs efficiently.
– **Reinforcement Learning Training**: Enhances operational efficiency.
– **Unified Reasoning and Non-Reasoning Models**: Eliminates the need for separate models, reducing complexity and cost.

The model is currently accessible via xAI’s website, mobile apps, OpenRouter, and Vercel AI Gateway. Free access will be available on select platforms during the launch period.

### Pricing and Availability

Grok 4 Fast comes in two versions: **grok-4-fast-reasoning** and **grok-4-fast-non-reasoning**, both supporting the two million token limit. Pricing starts at **$0.20 per million input tokens** for smaller workloads and scales with increased usage. This makes Grok 4 Fast an ideal solution for large projects or users seeking a fast and affordable AI model without sacrificing accuracy.

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Stay tuned for more updates on Grok 4 Fast and its evolving capabilities.
https://www.newsbytesapp.com/news/science/elon-musk-s-xai-launches-grok-4-fast-check-features-pricing/story