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- OthersPangram's new detector shows where an image is AI-made
- OpenAIOpenAI's GPT-Image-2.6 models reach the API
- OpenAIAn OpenAI prototype found 948 ways to get root on Linux
- DatabricksDatabricks jobs can run AI Functions as a task
- 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
How to Test a RAG App: Build an Evaluation Set (20 Questions)1:22 · from Build a RAG app
LangChain vs LlamaIndex: Do You Need a Framework for RAG?47 s · from Build a RAG app
The 5 Parts of a Home-Built RAG Pipeline (Chunks to Reranker)1:25 · from Build a RAG app
Gemini File Search Explained: What a Managed RAG Tool Does For You1:28 · from Build a RAG app