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Discover▾

Not sure where to start? This week’s hottest software, models and stacks in three minutes.

AI Apps▾

AI software people use: from assistants like ChatGPT to tools for coding, video and workflows, picked by purpose.

For Agents▾

Software for AI: tools that let your agent (Claude Code, Codex, Cursor…) browse, read docs, run code and remember.

Models▾

Choose models, estimate cost, self-host: prices, rankings, benchmarks, free tiers and compute.

Solutions▾

A goal or an error message? Ready-made stacks, steps and fixes by scenario.

Learn▾

A systematic course from zero to the frontier, with an algorithm library, must-read papers and tutorials.

Frontier▾

Daily AI news, weekly highlights, the latest papers and how AI is changing every discipline.

// Discover · topics

AI topics

Pick a topic, start from its main page, then go deeper through the related pages.

19 topics138 pagesofficial sources only

LLM API pricing comparison

Input and output price per million tokens for each model, every price sourced and dated, with a cost calculator and price-change log.

Free LLM APIs

Which LLM APIs you can call for free, their limits and rate caps, and whether a card is required — checked provider by provider.

MCP servers

A list of MCP servers, how to configure them in Claude Code, Cursor and Codex, and how to vet one before installing.

AI coding tools & models

Coding models by SWE-bench score and price side by side, then pick a coding agent and set it up.

AI agents

Tools agents can call, how to choose a framework, and how to handle memory and safety.

Run LLMs locally

Work out VRAM before buying hardware: how model size, quantisation and context length change memory, plus full build plans.

Open-weight models

Open-weight models by family: sizes, licences, VRAM needs and one-command run instructions.

LLM leaderboards

Latest scores across major benchmarks, each linked back to the official leaderboard.

AI subscription comparison

Plans and limits for ChatGPT, Claude, Gemini, Cursor and others, checked against official pricing pages.

AI news

AI news updated several times a day, linking only to original sources, with a weekly roundup.

Latest AI papers

LLM and AI papers from the last 30 days, a one-line takeaway each, linked to arXiv.

Learn AI

A free path from zero to LLMs and agents: staged units, hands-on practice and an algorithms atlas.

RAG & knowledge bases

Make AI answer from your own documents: parsing, retrieval, evaluation and common pitfalls.

Using AI in China

Using LLMs compliantly in China: available domestic models, compliant providers and caveats.

AI tools directory

AI software by purpose, official links only, marked open source or not, pricing model and maintenance status.

AI across disciplines

How far AI has gone in 43 disciplines: milestones, key work and sources.

AI software downloads

One download page per app: buttons go straight to the official installer or app store, with version, size, SHA-256 and install steps. Nothing re-hosted.

Cheapest LLM APIs

Ranked by blended price per 1M tokens: cheapest official APIs, cheapest per capability tier, and the cheapest channel for the same model.

API relays & aggregators

What API relays are and their risks (with the official terms quoted), plus legitimate aggregators, self-hosted gateways and Chinese vendors’ official APIs.