grok-4-fast：Xai的统一推理方法彻底改变了工具使用RL

Xai的Grok-4-fast统一了推理，优化成本并提高工具使用RL。通过2m toction上下文，发现它如何重塑搜索，编码和问答。

The world of AI is constantly evolving, and xAI's Grok-4-Fast is a prime example. This new model unifies reasoning and tool use, offering a cost-optimized solution for high-throughput applications.

AI的世界在不断发展，Xai的Grok-4-fast是一个很好的例子。这个新模型统一了推理和工具的使用，为高通量应用程序提供了成本优化的解决方案。

Grok-4-Fast: A New Era of Unified Reasoning

grok-4-fast：统一推理的新时代

Grok-4-Fast, the successor to Grok-4, is designed to merge "reasoning" and "non-reasoning" behaviors into a single set of weights. What does this mean? Previous Grok iterations separated long-chain reasoning from short responses, requiring separate models. Grok-4-Fast streamlines this process by using system prompts to steer behavior within a unified weight space.

Grok-4-fast是Grok-4的继任者，旨在将“推理”和“不合SHOUNT”行为合并为一组权重。这是什么意思？先前的迭代迭代将长链推理与短响应分开，需要单独的模型。 Grok-4-fast通过使用系统提示将行为引导在统一的重量空间中来简化此过程。

This unification has several key benefits. First, it reduces end-to-end latency, crucial for real-time applications like search and interactive coding. Second, it lowers token usage, translating to significant cost savings. xAI reports a ~40% reduction in “thinking” tokens compared to Grok-4 while maintaining competitive performance.

这个统一有几个关键的好处。首先，它减少了端到端的延迟，对于搜索和交互式编码等实时应用程序至关重要。其次，它降低了令牌使用情况，转化为大量成本节省。 XAI报告说，与Grok-4相比，“思维”令牌降低了约40％，同时保持竞争性能。

Tool-Use RL: The Agent's Secret Weapon

工具使用RL：代理商的秘密武器

Grok-4-Fast isn't just about reasoning; it's also a master of tool use. Trained end-to-end with tool-use reinforcement learning, the model can intelligently decide when to browse the web, execute code, or call upon other tools. This capability shines in search-centric agent benchmarks, with Grok-4-Fast achieving impressive scores on BrowseComp, SimpleQA, and Reka Research.

grok-4-fast不仅仅是推理；这也是工具使用的主人。经过工具使用的增强学习的端到端训练有素，该模型可以智能决定何时浏览网络，执行代码或调用其他工具。这种能力在以搜索为中心的代理基准中亮相，grok-4-fast在BrowseComp，SimpleQA和REKA研究方面取得了令人印象深刻的分数。

In fact, xAI's internal battle-testing on LMArena shows Grok-4-Fast (codename “menlo”) ranking #1 in the Search Arena, highlighting its prowess in this domain. The text variant (codename “tahoe”) also holds a strong position in the Text Arena, demonstrating its versatility.

实际上，XAI在LMARENA上的内部战斗测试显示了在搜索领域中排名第一的Grok-4-fast（代号为“ Menlo”），突出了其在该领域的实力。文本变体（代号为“ Tahoe”）在文本领域也具有强大的位置，证明了其多功能性。

Performance and Efficiency: A Winning Combination

性能和效率：获胜的组合

Beyond its agentic abilities, Grok-4-Fast delivers frontier-class performance on various benchmarks while optimizing token usage. Its pass@1 results on challenging tasks like AIME 2025 and GPQA Diamond rival Grok-4, but with significantly fewer tokens. xAI calls this “intelligence density,” claiming a ~98% reduction in price to reach the same benchmark performance as Grok-4.

除了其代理能力之外，Grok-4-Fast还可以在各种基准测试中提供边界级表演，同时优化令牌使用情况。它的通过@1的结果是挑战性的任务，例如Aime 2025和GPQA Diamond竞争对手Grok-4，但令牌却大大减少。 Xai称此“智能密度”称为约98％的价格，以达到与Grok-4相同的基准性能。

Deployment and Pricing: Accessibility for All

部署和定价：所有人的可访问性

Grok-4-Fast is generally available to all users in Grok’s Fast and Auto modes. Even free users can now access xAI’s latest model tier. For developers, xAI offers two SKUs—grok-4-fast-reasoning and grok-4-fast-non-reasoning—both with a 2M context window. The pricing is competitive, making it an attractive option for various applications.

Grok-4-fast通常适用于Grok的快速和自动模式中的所有用户。即使是免费用户，现在也可以访问XAI的最新型号层。对于开发人员而言，Xai提供了两个SKUS-Grok-4-fast-Reonisting和Grok-4-Fast-Non-Resounting-以及2M上下文窗口。定价具有竞争力，使其成为各种应用程序的吸引人选择。

Final Thoughts: The Future of Reasoning and Tool Use

最终想法：推理和工具使用的未来

Grok-4-Fast represents a significant step forward in AI development. By unifying reasoning and tool use, xAI has created a model that is not only powerful but also efficient and accessible. Whether you're building search engines, assistive agents, or interactive coding tools, Grok-4-Fast is a force to be reckoned with. Now if you'll excuse me, I have a sudden urge to train an AI to fetch me a perfectly brewed cup of coffee. The future is now, after all!

Grok-4-fast代表了AI开发中迈出的重要一步。通过统一推理和工具的使用，XAI创建了一个模型，该模型不仅功能强大，而且也有效且易于访问。无论您是构建搜索引擎，辅助代理还是交互式编码工具，Grok-4-fast都是不可忽视的力量。现在，如果您能原谅我，我突然渴望训练AI，为我提供一杯完美酿造的咖啡。毕竟，未来是现在！