Journal
Everything we have published.
Field notes, guides, our own primary research and the benchmark editions behind it. Filter to what you actually want to read.
The harness decides how many calls a task costs
The agent harness picks the credential and the re-send policy, so the same task bills differently — and may not reach your Anthropic API usage at all.
30 October 2026
Blog29 October 20266 min
Compacting a context costs twice
Blog27 October 20265 min
Isolating a sub-agent isolates its spend
Blog22 October 20265 min
A provider bill has no agents on it
Blog18 October 20266 min
Where the model runs changes what the loop costs
Blog16 October 20266 min
A sandbox bounds what an agent touches, not what it spends
Blog15 October 20265 min
Six agents at once is not six times one agent
Tutorial14 October 202615 min
Cost per section in a LangChain release-post agent
Blog10 October 20265 min
A cap on a shared client is not a cap on a run
Tutorial7 October 202615 min
Cost per graded chunk in a LangChain RAG agent
Tutorial16 September 202616 min
Per-attempt cost in a LangGraph code repair loop
Blog14 September 20266 min
A failed agent run is billed in full
Blog12 September 20266 min
A tool catalog is billed on every turn
Blog9 September 20266 min
Routing swaps the model, not the request
Tutorial9 September 202615 min
Cost per round in a LangChain deep research agent
Blog4 September 20265 min
The answers you discard are still on the bill
Blog2 September 20265 min
A cost figure you computed is not a receipt
Tutorial2 September 202615 min
Per-agent cost in a LangGraph supervisor loop
Blog22 August 20265 min
The experiment that measures a saving has its own bill
Blog21 August 20265 min
Cost per run depends on what counts as one run
Blog18 August 20265 min
A model has no single price per token
Blog17 August 20265 min
What a run costs depends on how the capacity was bought
Blog16 August 20265 min
A budget check cannot price the call it allows
Tutorial12 August 202614 min
Per-role cost in a LangChain coding agent
Blog10 August 20265 min
The identity a budget is keyed to decides what it stops
Blog9 August 20265 min
A daily cost rollup cannot answer per-run questions
Blog8 August 20265 min
A configured cost control is not an enforced one
Blog7 August 20265 min
Agent cost includes the calls you never wrote
Blog6 August 20265 min
Run quotas and concurrency caps do not bound spend
Tutorial6 August 202615 min
Cost per role in a LangGraph AI scientist that fans out
Blog5 August 20265 min
Tracking tokens is not the same as tracking cost
Tutorial5 August 202612 min
Cost per agent in a LangChain incident-brief pipeline
Blog4 August 20266 min
A cheaper model is not automatically a cheaper run
Blog3 August 20265 min
Finding which sub-agent burned the tokens in one run
Guide1 August 2026
How to evaluate an LLM cost tool
Guide1 August 2026
Find the agents already in your codebase
Guide1 August 2026
Gateway vs observability vs governance
Evidence1 August 2026
Every question we have been asked
Benchmark31 July 2026
We scanned 133 public agent repos. Most had a cost defect.
Evidence31 July 2026
The four cost defects
Benchmark31 July 2026
All benchmark editions
Blog31 July 20265 min
Provider spend limits are alerts, not limits
Blog31 July 20264 min
What a runaway agent actually costs