**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 announced the launch of a new model named **Grok 4 Fast**. This innovative system serves as a more affordable version of the existing Grok 4 and is designed to cater to both enterprise and consumer use cases. A key highlight of Grok 4 Fast is its ability to handle both reasoning and non-reasoning tasks within a single framework, significantly boosting efficiency.

### Cost Efficiency
Grok 4 Fast offers an improved cost-to-performance ratio compared to its predecessor. It utilizes approximately 40% fewer “thinking tokens” while maintaining similar accuracy across various benchmarks. An independent review by Artificial Analysis revealed that Grok 4 Fast achieves comparable results to Grok 4 at up to a staggering 98% reduction in spending, making it a highly cost-effective AI solution.

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

These results closely match those of the original Grok 4. Additionally, Grok 4 Fast showed strong capabilities in code execution and search-based tasks, achieving a pass rate of up to 95% on SimpleQA and scoring around 74% on the X Bench Deepsearch benchmark.

### Key Features of Grok 4 Fast
Grok 4 Fast boasts a massive **two million token context window**, enabling it to process large inputs efficiently. The model was trained using reinforcement learning techniques to enhance its performance and efficiency. Unlike previous iterations that required separate reasoning and non-reasoning models, Grok 4 Fast integrates both into a single system. This consolidation reduces latency and lowers operating costs significantly.

The model is accessible via multiple platforms, including xAI’s website, mobile apps, OpenRouter, and Vercel AI Gateway. Some platforms offer free access during the initial launch period.

### Pricing and Availability
Grok 4 Fast is available in two versions:
– **grok-4-fast-reasoning**
– **grok-4-fast-non-reasoning**

Both versions support the extensive two million token context limit. Pricing for Grok 4 Fast starts at **$0.20 per million input tokens** for smaller workloads, with rates increasing based on volume. This pricing structure makes it an attractive choice for large-scale projects or users seeking a fast, affordable AI solution without sacrificing accuracy.

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With Grok 4 Fast, xAI reinforces its commitment to delivering accessible, high-performance AI models that suit a wide range of applications.
https://www.newsbytesapp.com/news/science/elon-musk-s-xai-launches-grok-4-fast-check-features-pricing/story