**Next Article: Grok 4 Fast Arrives as Cheaper Alternative to xAI’s Grok-4**
*By Dwaipayan Roy | Sep 20, 2025, 06:46 PM*
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Elon Musk’s artificial intelligence (AI) company, xAI, has unveiled a new model called **Grok 4 Fast**, offering a more affordable alternative to the existing Grok 4. Designed for both enterprise and consumer use cases, this innovative system stands out by combining reasoning and non-reasoning tasks within a single framework, delivering high efficiency and versatility.
### Cost Efficiency
Grok 4 Fast provides a significantly better cost-to-performance ratio compared to its predecessor. It uses approximately **40% fewer “thinking tokens”** than Grok 4 while maintaining similar accuracy across multiple benchmarks. An independent review by Artificial Analysis highlighted that Grok 4 Fast achieves comparable results to Grok 4 at up to **98% less cost**, making it a highly economical option for users.
### Benchmark Performance
The model has demonstrated impressive performance on a range of industry-standard benchmarks:
– **85.7%** on GPQA Diamond
– **92%** on AIME 2025
– **93.3%** on HMMT 2025
These scores are close to those of Grok 4. Additionally, Grok 4 Fast showed improvements in code execution and search-based tasks, achieving a **95% pass rate on SimpleQA** and around **74% on X Bench Deepsearch**.
### Key Features
– **Massive Context Window:** Grok 4 Fast supports a two million token context window, enabling it to process very large inputs efficiently.
– **Reinforcement Learning:** The model was trained using reinforcement learning techniques to boost efficiency.
– **Unified Framework:** Unlike previous versions that required separate reasoning and non-reasoning models, Grok 4 Fast integrates both into a single system. This integration reduces latency and lowers operational costs significantly.
### Availability and Pricing
Grok 4 Fast is available in two versions: **grok-4-fast-reasoning** and **grok-4-fast-non-reasoning**, both supporting the extensive two million token limit.
Pricing starts at **$0.20 per million input tokens** for smaller workloads, with rates increasing based on token usage. This pricing structure makes Grok 4 Fast an ideal choice for large projects or anyone seeking a fast, affordable AI solution without sacrificing accuracy.
Users can access Grok 4 Fast through xAI’s website, mobile applications, OpenRouter, and the Vercel AI Gateway. Some platforms offer free access during the launch period.
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With its blend of cost-efficiency, robust performance, and large context capacity, Grok 4 Fast positions itself as a compelling option in the evolving AI landscape.
https://www.newsbytesapp.com/news/science/elon-musk-s-xai-launches-grok-4-fast-check-features-pricing/story