Free. No account.
Understand how AI, agents and data work, then use them well.
Free courses, step-by-step guides and calculators for AI engineering and data engineering, kept current every week.
What changed in AI and data
Every week- GoogleGoogle announces Gemini 4 Carbon, for cyber defenders first
- GoogleGemini API CLI lets a coding agent call Gemini from the shell
- GoogleNew Gemini API projects now store requests by default
- OpenAIOpenAI releases GPT-6.1 Terra at half the price of Sol
- Price change, Claude Sonnet 5.5
$0.20$0.1050%Cached input, per million tokens
AI engineering
Follow one request through an AI agent
- Sent
- Planned
- Called
- Looped
- Recalled
- Checked
- Answered
Step 1 of 7: Sent
The request goes out as tokens, most of them from the cache
Data engineering
Follow one order from the shop to an AI answer
- Made
- Captured
- Bronze
- Silver
- Checked
- Gold
- Answered
Step 1 of 7: Made
The shop's database writes a row, then changes it
Free calculators
Free calculators for model bills, data platform costs and sizing. Prices come from each maker's own page, read again every week.
AI models and agents
- Cost calculatorWhat your job costs, a day, a month or a year
- Which model for my jobThe cheapest model that is good enough for your job
- GPU memory calculatorHow much GPU memory a model needs
- Prompt caching calculatorWhen prompt caching pays off
- Token counterHow many tokens your text is, on every model
- Agent cost simulatorWhat an agent run costs, turn by turn
Data platforms
- Databricks cost calculatorWhat a Databricks cluster costs
- Snowflake cost calculatorWhat a Snowflake warehouse costs
- BigQuery cost calculatorWhat BigQuery costs, on demand or on slots
- Spark sizing calculatorSize a Spark or Databricks cluster
- Kafka sizing calculatorPartitions, brokers and disk for a Kafka topic
- Cron expression builderCron expressions for Airflow, Databricks and Snowflake
1,000a day
- GPT-6 Luna$10.50a month
- Grok 4.7$162a month
- Claude Fable 5.1$1,050a month
A question here is 1,500 tokens in and 400 out at each maker's listed price: the cheapest, a middle and the dearest of the newest models.
Short videos, longer lessons
Every video
Does RAG Make AI Smarter? No, It Makes It Informed48 s · on YouTube
Where You Already Use RAG: Claude Projects, ChatGPT Files, Help Chats1:00 · on YouTube
3 Ways RAG Still Gets It Wrong (and How to Spot Them)1:20 · on YouTube
How to Check an AI Answer: Grounded Answers With Page Numbers (RAG)1:21 · on YouTube