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Every resource founders actually use, in one library.

The essays, videos, podcasts, books and tools behind every answer across eChai's hubs, from starting up to go-to-market, D2C, founder money and AI, each with a note on why it is here.

What founders use most, ranked by how many answers lean on it.

  1. Grounded numbers on what AI COGS actually look like across real startups, not vibes. tanayj.com Article · How Founders Use AI The State of AI Gross Margins in 2025 Tanay Jaipuria (Wing VC)
  2. Fresh survey data showing margins improving from 41% to 45% and what the improvers did differently. upstartsmedia.com Article · How Founders Use AI Exclusive Data: Startups Are Learning What AI Profits Look Like Upstarts Media
  3. Routing, compaction, prompt trims, caching, batching: each lever quantified so you know what to do first. morphllm.com Article · How Founders Use AI LLM Cost Optimization: 5 Levers to Cut API Spend 70-85% Morph
  4. Engineering-level detail on token budgets and semantic caching from an infra company that measures it. redis.io Article · How Founders Use AI LLM Token Optimization: Cut Costs and Latency Redis
  5. Diagram-first explanations your whole team can absorb in ten minutes. pub.towardsai.net Article · How Founders Use AI 8 LLM Cost Optimization Techniques, Visually Explained Divy Yadav (Towards AI)
  6. A gateway gives you routing, fallbacks, and spend visibility in one move; this compares the options. helicone.ai Article · How Founders Use AI Top 5 LLM Gateways in 2025 Helicone
  7. Practical recipes for attributing AI spend per user and per feature, which is how you find the leaks. docs.helicone.ai Tool · How Founders Use AI Helicone cost tracking cookbook Helicone
  8. Live price, speed, and latency comparison across 500+ endpoints; check before you commit spend. artificialanalysis.ai Tool · How Founders Use AI LLM API Providers Leaderboard Artificial Analysis
  9. A sober side-by-side of per-token prices across the big three, including budget tiers. intuitionlabs.ai Article · How Founders Use AI LLM API Pricing Comparison (2025): OpenAI, Gemini, Claude IntuitionLabs
  10. A builder's receipts: one technique, a 90% real bill reduction, with the code that did it. medium.com Article · How Founders Use AI Prompt Caching is a Must: From $720 to $72 Monthly Du'An Lightfoot
  11. Actual production numbers for agent workloads, the costliest and least predictable AI feature type. medium.com Article · How Founders Use AI The Unit Economics of AI Agents: Budgeting LLM Costs with Real Numbers Nikhil Sood
  12. Understand your supplier's economics to predict where API prices go next. exponentialview.co Article · How Founders Use AI X-raying OpenAI's unit economics Azeem Azhar (Exponential View)
  13. A strategic view of vendor pricing games and how buyers should respond. cxotalk.com Podcast · How Founders Use AI Inside the AI Arms Race: LLMs, Economics, and Strategy CXOTalk with Nate B. Jones
  14. Willison narrates the price collapse and capability gains in one listenable year-in-review. latent.space Podcast · How Founders Use AI Simon Willison: Things we learned about LLMs in 2024 (Latent Space) Latent Space with Simon Willison
  15. The independent standard for comparing intelligence, speed, and price on one chart. artificialanalysis.ai Tool · How Founders Use AI LLM Leaderboard: Comparison of over 100 AI models Artificial Analysis
  16. Continuously updated rankings pulled straight from provider APIs; good second opinion. llm-stats.com Tool · How Founders Use AI LLM Stats: Compare 300+ models by intelligence, speed, price LLM Stats
  17. Product-builder-oriented leaderboard that maps benchmark scores to practical use cases. vellum.ai Tool · How Founders Use AI Vellum LLM Leaderboard Vellum
  18. Fastest way to sanity-check what any model actually costs before you wire it in. pricepertoken.com Tool · How Founders Use AI Price Per Token leaderboards Price Per Token
  19. A structured comparison across reasoning, coding, context, and compliance rather than hype. intuitionlabs.ai Article · How Founders Use AI Claude vs ChatGPT vs Copilot vs Gemini: Enterprise Guide IntuitionLabs
  20. Side-by-side output quality on real writing tasks, the kind of eval founders should copy. blog.type.ai Article · How Founders Use AI Who Wrote it Better? Claude vs ChatGPT vs Gemini Type.ai
  21. Explains what each benchmark measures so you stop choosing models on a single headline number. futureagi.com Article · How Founders Use AI LLM Benchmarks: GPT-5, Claude, Gemini, Grok compared Future AGI
  22. A serving-infrastructure company's practical map of the open-weight landscape. bentoml.com Article · How Founders Use AI The Best Open-Source LLMs BentoML
  23. A decision framework for the open-vs-closed call, written for teams shipping to customers. techcommunity.microsoft.com Article · How Founders Use AI Comparing Open-Source vs Closed LLMs for Enterprise Apps Microsoft
  24. Covers the hybrid pattern most teams actually land on: closed for frontier tasks, open for private or high-volume ones. hakia.com Article · How Founders Use AI Open Source vs Closed LLMs: Technical Comparison Hakia

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The hubs

Starting Up Find an idea, validate it, build, and land your first customers. 1046 questions GTM Go-to-market, from breaking in to how the best teams do it. 352 questions D2C Building a direct-to-consumer brand, India-first. 482 questions Wealth Paying yourself, ESOPs, secondaries, and de-risking founder wealth. 154 questions How Founders Use AI How founders actually put AI to work, mapped topic by topic. 278 questions Glossary Plain-language definitions of the startup and VC terms you'll hit. 390 terms
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