In recent years, the term local AI has started to appear more frequently in technical discussions and product descriptions. At a basic level, local AI refers to models that run directly on a user's device or within a controlled local environment, rather than relying on remote cloud infrastructure. This shift didn't happen suddenly. It emerged as a response to growing concerns around data privacy, constant dependence on internet connectivity, and the rising cost of cloud-based AI systems. Tools like Sigma Browser reflect this change by bringing AI execution back onto the user's machine instead of outsourcing it to external servers.
What is a local LLM?
A local LLM is an AI that performs all its work on the device where it's installed, such as a personal computer or internal server. The key distinction is that inference is executed under the user's direct control, with no need to send requests to external servers to generate text.
From a functional perspective, local LLMs are capable of many of the same tasks as cloud-based models. They can generate text, answer questions, analyze documents, and assist with writing. The difference lies not in what the model can do, but in where and how it does it. With local AI, prompts, contextual information, and generated outputs are processed on the device itself, rather than being transmitted to an external service.
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How local LLM Works with User Data?
Conventional AI lives in the cloud, and you "rent" its brain by sending your data over the internet. Local AI in Sigma is a file you download once. After that, it doesn't need the internet. Your thoughts, documents, and passwords no longer travel through wires to other data centers; they stay inside your computer. This changes everything: you no longer have to "trust" corporations at their word that they're not spying on you – you simply physically deprive them of that ability.
Because computation happens locally, the handling of data depends entirely on the user's hardware and configuration. More powerful machines can run larger or faster models, while less capable devices may rely on smaller or optimized versions. Regardless of model size, the core principle remains the same: all processing happens locally, without external dependencies.
Another important aspect is that local AI does not rely on remote logging or request-based monitoring to function. Since there is no need to send prompts to a server, users do not have to consider how their inputs might be stored, reviewed, or reused elsewhere. Control over data lifecycle and retention stays within the local system.
Why We Want to Run Local LLMs?
The idea of running language models locally is not new, but until recently it was largely impractical. Earlier generations of large models required substantial computational resources that were only available in data centers. Memory constraints, hardware costs, and software complexity made local execution inaccessible for most users.
Several developments changed this situation. Open-source LLM models became widely available, allowing experimentation outside closed cloud platforms. At the same time, optimization techniques such as quantization reduced the hardware requirements for inference. Consumer hardware also improved significantly, making it possible to run complex models on personal devices.
As a result, local LLMs transitioned from experimental setups to practical tools. What once required specialized infrastructure can now run on laptops and workstations, enabling new ways to use AI without relying on constant internet access or external processing.
How to Run Local LLMs in 2026?
Running local large language models in 2025 requires an understanding of your hardware, because all computation happens on your own machine. Unlike cloud AI, performance, speed, and model size are limited by what your computer can handle.
Below are the four main hardware components that matter when running local LLMs, explained in practical terms.
Graphics Processing Unit (GPU)
The GPU is the most important component for running local AI models. It is responsible for performing the mathematical operations required for text generation. While CPUs can run small models, GPUs are significantly faster and are required for larger models.
VRAM refers to video memory on the GPU. It determines how large a model your system can load.
B stands for billions of parameters. More parameters generally mean a more capable model, but they also require more VRAM.
Typical requirements
- Entry level: RTX 3060 Ti (16 GB VRAM) – suitable for 7–13 B model parameters
- Recommended: RTX 4090 (24 GB VRAM) – handles 30 B+ models efficiently
- High performance: H100 (80 GB VRAM) – for enterprise deployment with the largest models
- Alternative: Multiple RTX 3090s (24 GB each) for cost-effective scaling
Why this matters
If your GPU does not have enough VRAM, the model simply will not load. This is the most common limitation users encounter.
How to check your GPU and VRAM
System Memory (RAM)
System RAM acts as your computer's general workspace. While VRAM houses the actual model, system RAM manages active data processing, background caching, and seamless multitasking during AI inference.
If you run out of RAM, the system may slow down dramatically or fail to run the model properly.
Typical requirements
- 16 GB minimum for basic 7B models
- 32 GB recommended for 13–30 B parameter models
- 64 GB for 70 B+ parameter models
- 128 GB+ for production deployments with multiple concurrent users
Why this matters
Even if your GPU is strong, insufficient RAM can bottleneck performance or cause crashes.
How to check your RAM
Processor Requirements
The CPU coordinates tasks, manages data flow, and supports parts of inference that are not handled by the GPU. While the CPU is not the primary bottleneck, modern instruction support and multiple cores improve overall stability and responsiveness.
Typical requirements
- AVX2 instruction support (standard on modern CPUs)
- Multi-core processors for efficient parallel processing
- AMD Ryzen 9 7950X3D or Intel Core i9-13900K recommended
- Server-grade AMD EPYC or Intel Xeon for enterprise use
Why this matters
A weak CPU can slow down loading, preprocessing, and multitasking, even with a strong GPU.
How to check your CPU
Storage Configuration
Local models are large files. Storage speed directly affects how quickly models load and how responsive the system feels.
NVMe SSDs are significantly faster than traditional HDDs or SATA SSDs and are strongly recommended.
Typical requirements
- NVMe SSD mandatory for model loading and inference
- Minimum 1TB capacity for model storage
- Separate OS and model drives recommended
- High-speed networking for distributed deployments
Why this matters
Slow storage increases startup times and can interrupt workflows when loading or switching models.
How to check your storage
Best Local LLM Models with Open-Source
Most best local LLMs force users to manually tune settings and hardware constraints, but Sigma AI removes this complexity entirely. Our system automatically detects your device's technical limits and configures the local model to match your hardware perfectly. By balancing raw performance with system responsiveness, Sigma eliminates the need for you to choose specific models or tweak parameters yourself. This ensures that Sigma delivers a consistent, high-quality AI experience across any machine, preventing resource overload and keeping your workflow fast.
The hardware requirements for some of the LLM families are shown here:
Local AI: The Architectural Choice
Local AI is more about the way it's designed than the features it offers. It changes where computation happens, how data is handled, and who controls the execution environment. These changes can impact things like trust assumptions, operational constraints, and the types of tasks that can be done comfortably.
As these local LLM models become more available, they offer an alternative to cloud-based systems for users who value autonomy, privacy and offline capability. It's easier to know when this approach is appropriate if you understand how local AI works in practice.
Rather than treating local models as a separate technical setup, some modern tools apply this architecture directly inside everyday applications. Sigma Eclipse is an example of this approach in practice. When activated in a browser, the model runs on the user's device and can be used for tasks such as summarising web pages, drafting text, organising information or automating routine browser actions. These tasks are processed locally without any prompts, context or results being sent to external servers. This makes local AI not only usable for experimentation, but also for daily work scenarios where privacy, predictability or limited connectivity are important considerations.
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