--- title: Best ai-assisted-development posts — September 2025 description: The most upvoted ai-assisted-development posts from September 2025, curated by the daily.dev community. canonical: https://daily.dev/tags/ai-assisted-development/best-of/2025/09 twitter:card: summary_large_image twitter:site: @dailydotdev og:url: https://daily.dev/tags/ai-assisted-development/best-of/2025/09 og:type: website og:site_name: daily.dev og:title: Best ai-assisted-development posts — September 2025 | daily.dev og:description: The most upvoted ai-assisted-development posts from September 2025, curated by the daily.dev community. og:image: https://media.daily.dev/image/upload/s--VAY5ToZt--/f_auto/v1724209435/public/daily.dev%20-%20open%20graph --- # Best of ai-assisted-development — September 2025 1. 1 [](/posts/spec-driven-development-using-markdown-as-a-programming-language-when-building-with-ai-xthmztklw "Spec-driven development: Using Markdown as a programming language when building with AI") Article GitHub Blog · 1y Spec-driven development: Using Markdown as a programming language when building with AI A developer shares an experimental approach to building applications by writing specifications entirely in Markdown and using GitHub Copilot to compile them into actual code. The workflow involves maintaining app logic in markdown files, using AI to generate Go code, and keeping documentation synchronized with implementation. This spec-driven development method aims to solve context loss issues with AI coding agents while enabling faster iteration and cleaner specifications. 67 10 2. 2 [](/posts/codebuff-claudecode-killer-new-ai-coding-agent-is-quite-powerful-free-opensource--6jjfw76ke "CodeBuff: ClaudeCode KILLER! New AI Coding Agent is Quite Powerful, FREE, & Opensource!") Article Reinier · 1y CodeBuff: ClaudeCode KILLER! New AI Coding Agent is Quite Powerful, FREE, & Opensource! CodeBuff is a new open-source, multi-agent AI coding assistant that offers both CLI and SDK integration for development workflows. It positions itself as a powerful alternative to existing AI coding tools like ClaudeCode, providing free access to developers. 65 4 3. 3 [](/posts/vibe-coding-just-got-an-upgrade-with-claude-sonnet-4-5-xm9bqd37p "Vibe coding just got an upgrade with Claude Sonnet 4.5") Article Agentic Engineering · 1y Vibe coding just got an upgrade with Claude Sonnet 4.5 Anthropic released Claude Sonnet 4.5, their latest and most capable coding model that reportedly outperforms the previous Opus 4.1 version. 53 18 4. 4 [](/posts/hugging-face-opens-github-copilot-chat-to-open-source-models-6nosoa5ma "Hugging Face Opens GitHub Copilot Chat to Open-Source Models") Article DevOps.com · 1y Hugging Face Opens GitHub Copilot Chat to Open-Source Models Hugging Face released a VS Code extension that integrates open-source large language models directly into GitHub Copilot Chat. Developers can now access hundreds of inference providers and switch between specialized models like DeepSeek V3.1, GLM 4.5, and Kimi K2 without leaving their editor. The integration offers flexibility to choose models optimized for specific programming languages, frameworks, or domains, breaking free from proprietary model limitations. The extension requires VS Code 1.104.0 or newer and offers a free tier for experimentation with pay-as-you-go pricing for additional capacity. 38 2 5. 5 [](/posts/claude-opus-4-1-is-now-generally-available-in-github-copilot-b7cepymui "Claude Opus 4.1 is now generally available in GitHub Copilot") Article GitHub Changelog · 1y Claude Opus 4.1 is now generally available in GitHub Copilot Claude Opus 4.1 is now available in GitHub Copilot for Pro+ and Enterprise users across multiple IDEs including VS Code, Visual Studio, JetBrains, Xcode, and Eclipse. Enterprise administrators need to enable the new policy in Copilot settings, while Pro+ users can activate it through the model picker with a one-time confirmation prompt. 24 [See all ai-assisted-development archives](/tags/ai-assisted-development/best-of) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@graph":[{"@type":"CollectionPage","@id":"https://daily.dev/tags/ai-assisted-development/best-of/2025/09#page","url":"https://daily.dev/tags/ai-assisted-development/best-of/2025/09","name":"Best ai-assisted-development Posts — September 2025","description":"The most upvoted ai-assisted-development posts from September 2025, curated by the daily.dev community.","isPartOf":{"@type":"WebSite","url":"https://daily.dev"}},{"@type":"ItemList","@id":"https://daily.dev/tags/ai-assisted-development/best-of/2025/09#items","numberOfItems":5,"itemListElement":[{"@type":"ListItem","position":1,"url":"https://daily.dev/posts/spec-driven-development-using-markdown-as-a-programming-language-when-building-with-ai-xthmztklw","name":"Spec-driven development: Using Markdown as a programming language when building with AI"},{"@type":"ListItem","position":2,"url":"https://daily.dev/posts/codebuff-claudecode-killer-new-ai-coding-agent-is-quite-powerful-free-opensource--6jjfw76ke","name":"CodeBuff: ClaudeCode KILLER! 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