--- title: "LLMs-from-scratch vs semantic-router" type: "comparison" canonical_url: "https://www.graphcanon.com/compare/rasbt-llms-from-scratch-vs-vllm-project-semantic-router" tools: ["rasbt-llms-from-scratch", "vllm-project-semantic-router"] --- # LLMs-from-scratch vs semantic-router *GraphCanon updated Jul 11, 2026* ## Verdict Pick LLMs-from-scratch when lLMs-from-scratch is primarily Jupyter Notebook; semantic-router is Go; pick semantic-router when semantic-router is primarily Go; LLMs-from-scratch is Jupyter Notebook. [LLMs-from-scratch](https://amzn.to/4fqvn0D) reports 99k GitHub stars, 15k forks, and 4 open issues, last pushed Jun 2, 2026. [semantic-router](https://vllm-semantic-router.com) has 4.9k stars, 745 forks, and 214 open issues, last pushed Jul 11, 2026. Figures are from public GitHub metadata via [LLMs-from-scratch's repository](https://github.com/rasbt/LLMs-from-scratch) and [semantic-router's repository](https://github.com/vllm-project/semantic-router). | | [LLMs-from-scratch](/tools/rasbt-llms-from-scratch.md) | [semantic-router](/tools/vllm-project-semantic-router.md) | | --- | --- | --- | | Tagline | Implement a ChatGPT-like LLM in PyTorch from scratch, step by step | System level intelligent runtime for Mixture-of-Models across edge, data center and cloud | | Stars | 98,899 | 4,916 | | Forks | 15,183 | 745 | | Open issues | 4 | 214 | | Language | Jupyter Notebook | Go | | Adopt for | LLMs-from-scratch is a project-oriented repository aimed at building PyTorch-based language models from the ground up, with detailed step-by-step instructions. | - | | Persona | - | - | | Runtime | - | - | | License | Other | Apache-2.0 | | Categories | LLM Frameworks, Model Training | Inference & Serving, LLM Frameworks, Model Training | ## Trust and health _Sourced signals - not a safety guarantee. No winner column._ | | [LLMs-from-scratch](/tools/rasbt-llms-from-scratch.md) | [semantic-router](/tools/vllm-project-semantic-router.md) | | --- | --- | --- | | Maintenance | Steady (60%) | Very active (96%) | | Days since push | 38d | 0d | | Open issues (now) | 4 | 214 | | Owner type | User | Organization | | Security scan | No lockfile | No MCP manifest | | Full report | [trust report](/tools/rasbt-llms-from-scratch/trust.md) | [trust report](/tools/vllm-project-semantic-router/trust.md) | ## Decision facts: LLMs-from-scratch - **Adopt for:** LLMs-from-scratch is a project-oriented repository aimed at building PyTorch-based language models from the ground up, with detailed step-by-step instructions. ## Choose when ### Choose LLMs-from-scratch if… - LLMs-from-scratch is primarily Jupyter Notebook; semantic-router is Go. - License: LLMs-from-scratch is Other, semantic-router is Apache-2.0. - Tags unique to LLMs-from-scratch: ai, artificial-intelligence, attention mechanism, deep-learning. - - You are an advanced practitioner aiming to fully understand the underpinnings of LLMs using PyTorch as your primary framework. ### Choose semantic-router if… - semantic-router is primarily Go; LLMs-from-scratch is Jupyter Notebook. - License: semantic-router is Apache-2.0, LLMs-from-scratch is Other. - Tags unique to semantic-router: ai-gateway, bert-classification, fine-tuning, golang. - Also covers Inference & Serving. ## When NOT to use LLMs-from-scratch - - If you are looking for a rapid deployment of an LLM without understanding its intricate structure - this tool requires extensive manual and conceptual work. - - You prefer frameworks with automatic model generation or other high-level abstractions that simplify the process. This repository emphasizes manual creation, which is more time-consuming but offers丰 - a deeper learning experience. ## When NOT to use semantic-router - Inference & Serving: Self-hosting rarely beats a hosted API on cost until you have steady, high-volume traffic. - LLM Frameworks: Avoid a framework for a single prompt-and-retrieve call; the abstraction can cost more than it saves. - Model Training: Try prompting and RAG first; fine-tuning is the answer to style/format, not missing knowledge. ## Common questions ### What is the difference between LLMs-from-scratch and semantic-router? LLMs-from-scratch: Implement a ChatGPT-like LLM in PyTorch from scratch, step by step. semantic-router: System level intelligent runtime for Mixture-of-Models across edge, data center and cloud. See the comparison table for live GitHub stats and shared categories. ### When should I choose LLMs-from-scratch over semantic-router? Choose LLMs-from-scratch over semantic-router when LLMs-from-scratch is primarily Jupyter Notebook; semantic-router is Go; License: LLMs-from-scratch is Other, semantic-router is Apache-2.0; Tags unique to LLMs-from-scratch: ai, artificial-intelligence, attention mechanism, deep-learning; - You are an advanced practitioner aiming to fully understand the underpinnings of LLMs using PyTorch as your primary framework. ### When should I choose semantic-router over LLMs-from-scratch? Choose semantic-router over LLMs-from-scratch when semantic-router is primarily Go; LLMs-from-scratch is Jupyter Notebook; License: semantic-router is Apache-2.0, LLMs-from-scratch is Other; Tags unique to semantic-router: ai-gateway, bert-classification, fine-tuning, golang; Also covers Inference & Serving. ### When should I avoid LLMs-from-scratch? - If you are looking for a rapid deployment of an LLM without understanding its intricate structure - this tool requires extensive manual and conceptual work. - You prefer frameworks with automatic model generation or other high-level abstractions that simplify the process. This repository emphasizes manual creation, which is more time-consuming but offers丰 a deeper learning experience. ### When should I avoid semantic-router? Inference & Serving: Self-hosting rarely beats a hosted API on cost until you have steady, high-volume traffic. LLM Frameworks: Avoid a framework for a single prompt-and-retrieve call; the abstraction can cost more than it saves. Model Training: Try prompting and RAG first; fine-tuning is the answer to style/format, not missing knowledge. ### Is LLMs-from-scratch or semantic-router more popular on GitHub? LLMs-from-scratch has more GitHub stars (98,899 vs 4,916). Stars measure visibility, not whether either tool fits your constraints. ### Are LLMs-from-scratch and semantic-router open source? Yes - both are open-source projects on GitHub (LLMs-from-scratch: Other, semantic-router: Apache-2.0). ### Where can I find alternatives to LLMs-from-scratch or semantic-router? GraphCanon lists graph-backed alternatives at [LLMs-from-scratch alternatives](/tools/rasbt-llms-from-scratch/alternatives) and [semantic-router alternatives](/tools/vllm-project-semantic-router/alternatives) ([LLMs-from-scratch markdown twin](/tools/rasbt-llms-from-scratch/alternatives.md), [semantic-router markdown twin](/tools/vllm-project-semantic-router/alternatives.md)), ranked by typed relationship edges rather than popularity votes. ### Is there a machine-readable version of this comparison? Yes. The markdown twin at [this comparison](/compare/rasbt-llms-from-scratch-vs-vllm-project-semantic-router.md) mirrors this page for agents and LLM crawlers, with the same stats table and FAQ answers. ### Which is better maintained, LLMs-from-scratch or semantic-router? LLMs-from-scratch: Steady. semantic-router: Very active. Compare maintenance labels, days since push, and release cadence in the trust section below - stars alone do not measure maintenance. ### Where are the full trust reports for LLMs-from-scratch and semantic-router? GraphCanon publishes per-repo trust reports with dated maintenance, provenance, and scan summaries: [LLMs-from-scratch trust report](/tools/rasbt-llms-from-scratch/trust); [semantic-router trust report](/tools/vllm-project-semantic-router/trust). --- **Machine-readable endpoints** - JSON: [`/api/graphcanon/graph?tool=rasbt-llms-from-scratch`](/api/graphcanon/graph?tool=rasbt-llms-from-scratch) - LLM index: [/llms.txt](/llms.txt) - Full corpus: [/llms-full.txt](/llms-full.txt) _GraphCanon - The knowledge graph for AI development. https://www.graphcanon.com/_