Build an agent, then see what it cost
Each tutorial builds a working agent in a named framework, pinned to a version, with runnable code. The agent stands on its own — the cost instrumentation comes last, once there is something to measure.
LangChainanthropic15 min
Cost per section in a LangChain release-post agent
A planner, a parallel section writer, an editor and a summarizer in LangChain 1.x on Claude, then a blocking budget on the role that fans out.
14 October 2026
LangChainopenai15 min
Cost per graded chunk in a LangChain RAG agent
A rewriter, an LLM relevance grader over retrieved chunks, an answerer and a grounding check in LangChain 1.x on OpenAI, then a budget on the grader.
7 October 2026
LangGraphanthropic16 min
Per-attempt cost in a LangGraph code repair loop
A planner, parallel patchers and a test runner in LangGraph 1.x on Claude, then per-agent cost and a blocking budget on the role that fans out.
16 September 2026
LangChainanthropic15 min
Cost per round in a LangChain deep research agent
A planner, batched researchers over a fixed corpus, a gap-finder and a writer in LangChain 1.x on Claude, then per-agent cost and a budget on the fan-out.
9 September 2026
LangGraphopenai15 min
Per-agent cost in a LangGraph supervisor loop
A supervisor that delegates requirements to specialists in LangGraph 1.x on GPT-4.1, then four cost rows and a blocking budget on the role that multiplies.
2 September 2026
LangChainopenai14 min
Per-role cost in a LangChain coding agent
A triager, parallel file readers, an editor and a reviewer in LangChain 1.x on GPT-4.1, then per-agent cost and a blocking budget on the role that fans out.
12 August 2026
LangGraphanthropic15 min
Cost per role in a LangGraph AI scientist that fans out
A planner, hundreds of parallel probes, a referee and a synthesist in LangGraph 1.x on Claude, instrumented into four cost rows with a budget on the probes.
6 August 2026
LangChainanthropic12 min
Cost per agent in a LangChain incident-brief pipeline
A planner, parallel analysts, a critic and a writer in LangChain 1.x on Claude, then per-agent cost and a blocking budget on the role that multiplies.
5 August 2026