From the blog
Practical LLM cost guides for developers.
Breakdowns for builders shipping AI products.
Your OpenAI Bill Doubled. Here's Which Feature Caused It.
Most developers find out about LLM cost spikes from their Stripe invoice. Here's how to know within one second — broken down by feature.
2026-09-11 · 7 min
Read →Model SelectionGPT-4o, GPT-4o Mini, GPT-5.6 Luna and Gemini 3.6 Flash Costs
Benchmarks won't tell you which model is cheapest for your app. Your token counts will.
2026-09-11 · 8 min
Read →Cost Optimization15-20% of Your LLM Requests Are Duplicates. You're Paying for All of Them.
Duplicate requests with no caching represent 15-20% of all requests in a typical production app.
2026-09-05 · 7 min
Read →ForecastingStop Being Surprised by Your AI Bill: How to Know Next Month's Cost Today
Spend forecasting with linear regression on 14 days of data lets you act 7 weeks before the problem becomes critical.
2026-08-28 · 7 min
Read →Cost OptimizationReasoning Tokens: The Invisible Line Item in Every New AI Model
GPT-5.6, Claude Opus 5, and Gemini 3 all reason before they answer. That reasoning is billed at the output rate — and most of it you never see.
2026-08-15 · 9 min
Read →Cost OptimizationPrompt Caching: The 90% Discount Most LLM Apps Aren't Using
Every major provider now discounts a repeated prompt prefix by up to 90%. For apps with a large system prompt or fixed context, it's the biggest cost lever available — and the one most teams leave switched off.
2026-08-11 · 8 min
Read →Model SelectionThe Cheapest LLM APIs, Compared (And Why the Ranking Flips)
A current, per-token comparison of the major LLM APIs — and the reason the cheapest option changes depending on whether your workload is input-heavy, output-heavy, or long-context.
2026-08-11 · 9 min
Read →Monitoring & ObservabilityLLM Cost Alerts and Budget Limits: A Setup Guide
A runaway LLM process can spend a month of budget in an hour, and a provider dashboard won't show it until the next day. Here's what to alert on, where to enforce hard limits, and how to make the alerts actionable.
2026-08-11 · 8 min
Read →Cost TrendsLLM Prices Fell 80% Last Year. Your Bill Doubled Anyway. Here's Why.
Inference costs drop ~50% per year. The average production SaaS AI bill doubled in 2025.
2026-08-10 · 7 min
Read →Unit EconomicsWhy Your AI SaaS Has 52% Gross Margins Instead of 80%: The LLM Cost Problem No One Budgets For
Traditional SaaS runs at 70-90% gross margins. AI SaaS runs at 52%.
2026-08-02 · 10 min
Read →ArchitectureThe $40,000 Bill You Don't Know Is Coming: LLM Vendor Lock-In
Three companies needed to migrate away from OpenAI after a pricing change.
2026-07-22 · 9 min
Read →Model SelectionYou're Using GPT-4 for Everything. That's a 30x Mistake for Half Your Features.
The same task costs $0.20 with GPT-3.5 and $6.00 with GPT-4.
2026-07-20 · 8 min
Read →Cost OptimizationYour System Prompt Is Your Biggest LLM Cost Driver. Most Developers Don't Know This.
A 4,000-token system prompt × 100,000 requests = 400 million input tokens.
2026-07-19 · 7 min
Read →Cost OptimizationThe Silent Cost Multiplier in Every Chat Feature: Your Conversation History
A 20-turn conversation can cost 10x what you estimated.
2026-07-10 · 8 min
Read →Agentic AIThe Invisible 40%: How Retry Logic Is Inflating Your LLM Bill Right Now
A real company's retry-on-timeout logic added 40% to their LLM bill without a single person noticing.
2026-07-08 · 8 min
Read →Real Incidents$200 to $6,000 in One Month: The Gemini Bill That Changed How This Founder Thinks About AI Costs
A real founder's Gemini API bill jumped $5,800 in 30 days with no alerts, no feature breakdown, and no warning.
2026-07-06 · 7 min
Read →Setup & IntegrationLLM Cost Tracking for SaaS: The Setup Guide No One Wrote
A practical guide to instrumenting every LLM call in your SaaS product.
2026-07-04 · 10 min
Read →Model SelectionGemini vs OpenAI API for SaaS Builders: An Honest Cost and Quality Comparison
Google's models are significantly cheaper for many use cases. Here's when to switch.
2026-07-02 · 7 min
Read →Cost OptimizationHow to Calculate Your Real LLM API Cost (The Numbers Most Guides Get Wrong)
Reasoning tokens, retries, context overhead — your real cost is 2–4x the headline rate.
2026-06-30 · 8 min
Read →Agentic AILLM Agent Cost Control: How One Bad Loop Can Cost You $200 in an Hour
Agentic AI workflows can spend 100x your normal hourly rate in a single infinite loop.
2026-06-28 · 7 min
Read →Tool ComparisonsHelicone vs Langfuse vs LLMtrack: Which One Is Right for Solo Builders?
An honest comparison for developers shipping AI SaaS products — not ML ops teams.
2026-06-26 · 9 min
Read →Unit EconomicsThe Unit Economics of AI Features: Is Your Chatbot Actually Profitable?
Cost per user, cost per conversation, margin per customer — how to calculate whether your AI features are profitable.
2026-06-24 · 8 min
Read →Monitoring & ObservabilityReal-Time vs Delayed LLM Monitoring: Why the 24-Hour Gap Is Costing You
When your LLM monitoring updates once a day, a runaway loop can run for hours before you see it.
2026-06-22 · 6 min
Read →Cost OptimizationHow to Reduce Your OpenAI API Bill by 40–80% Without Touching Your Prompts
Token optimization, caching, and model switching — ranked by impact and effort.
2026-06-20 · 9 min
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