Every resource founders actually use, in one library.

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

1. Cached reads cost 10% of normal input price; the single highest-leverage cost lever, from the primary source. platform.claude.com Guide · How Founders Use AI Prompt caching (Claude docs) Anthropic
2. A flat 50% discount for anything that can wait up to 24 hours, like digests, enrichment, and backfills. developers.openai.com Guide · How Founders Use AI Batch API (OpenAI docs) OpenAI
3. 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)
4. 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
5. 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
6. 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
7. 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)
8. 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
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 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
14. 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
15. 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
16. 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
17. 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
18. 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
19. From an India-founded ML platform: how gateways make model choice reversible. truefoundry.com Article · How Founders Use AI Helicone vs OpenRouter: Key Differences TrueFoundry
20. The lock-in insurance layer compared hands-on, including India-built Portkey. klymentiev.com Guide · How Founders Use AI LLM Gateway guide: OpenRouter vs LiteLLM vs Portkey vs Helicone Dmytro Klymentiev
21. A second, eval-minded view on routing layers so you can switch providers in an afternoon. braintrust.dev Article · How Founders Use AI 6 best LLM gateways for developers Braintrust
22. A regularly refreshed plain-English rundown of the current frontier models and their sweet spots. codingscape.com Article · How Founders Use AI Most powerful LLMs (Large Language Models) Codingscape
23. The essay that made evals a founder-level topic; failed LLM products almost always skipped this. hamel.dev Article · How Founders Use AI Your AI Product Needs Evals Hamel Husain
24. A free written masterclass version if you want the method without the course fee. aakashg.com Guide · How Founders Use AI How to Master AI Evals: Step-by-Step with Hamel and Shreya Aakash Gupta (Product Growth)

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