AI

Show HN: I built a tiny LLM to demystify how language models work (github.com) AI

The Show HN post and GitHub repository introduce “GuppyLM,” a simple ~9M-parameter language model trained from scratch on synthetic fish-themed conversations. It walks through the full pipeline—dataset generation, tokenizer training, a vanilla transformer architecture, a basic training loop, and inference—aiming to make LLM internals less of a black box. The project highlights design tradeoffs (single-turn chats, no system prompt, limited context) and provides notebooks and code for reproducing training and running the model.

Show HN: Mdarena – Benchmark your Claude.md against your own PRs (github.com) AI

mdarena is an open-source tool that benchmarks Claude.md instructions by mining real merged PRs from your codebase, running the generated patches against the repo’s actual test suites, and comparing the results to the gold diffs. It reports test pass/fail, patch overlap, and token/cost-related metrics, using history-isolated checkouts to avoid information leakage. The project also includes a SWE-bench-compatible workflow and notes mixed results when consolidating guidance versus using per-directory instructions.

Recall – local multimodal semantic search for your files (github.com) AI

Recall is an open-source tool that enables local multimodal semantic search over your files by embedding images, audio, video, PDFs, and text into a locally stored vector database (ChromaDB). It matches natural-language queries across file types without requiring tagging or renaming, and includes an animated setup wizard plus a Raycast extension for quick visual results. Embeddings are generated using Google’s Gemini Embedding 2 API, while the vector index and files remain on your machine.

'Cognitive Surrender' Is a New and Useful Term for How AI Melts Brains (gizmodo.com) AI

The article highlights a new term, “cognitive surrender,” used to describe how people may increasingly defer their thinking to AI chatbots—even when the AI is wrong. It summarizes a Wharton study where participants used an AI during a math-style reasoning test and were more likely to accept incorrect answers, with higher reported confidence when using the chatbot. The author notes the work may fit into broader concerns about reduced critical thinking and also flags that psychology findings can be hard to replicate.

Spath and Splan (sumato.ai) AI

The post argues that AI coding agents should interact with code using semantic “narratives” rather than filesystem rituals. It introduces Spath (a symbol-addressing format) and Splan (a minimal grammar for batched code-change intentions), claiming they reduce filesystem operations and improve agent efficiency and reliability via transactional edits. Sumato AI says it is open-sourcing the Spath and Splan grammars and provides an example Spath dialect for Go.

OpenAI's fall from grace as investors race to Anthropic (latimes.com) AI

The article says OpenAI’s shares are becoming hard to sell on secondary markets as institutional investors shift toward Anthropic, which is seeing record demand and higher bids. It attributes the pivot to perceived risk-reward, including Anthropic’s focus on profitable enterprise customers versus OpenAI’s heavier infrastructure spending. The piece also notes OpenAI’s recent, large fundraising round and highlights regulatory and security setbacks affecting Anthropic, even as investors remain eager to buy its equity.

Show HN: TermHub – Open-source terminal control gateway built for AI Agents (github.com) AI

TermHub is an open-source “AI-native” CLI/SDK that provides a native control gateway for iTerm2 and Windows Terminal, letting LLMs or AI agents open tabs/windows, target sessions, send text/keystrokes, and capture terminal output programmatically. The project includes a machine-readable spec/handles for AI handoff, plus a send-to-capture “delta” checkpoint mode so agents can retrieve only the new output produced after a command. It’s distributed via npm/Homebrew (macOS) and GitHub releases (binaries), with an SDK preview for JS/TypeScript.