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Datadog's Agent Observability bills on one thing: the count of LLM spans. Tool, retrieval and agent spans are free. Here is how the meter works, where the published pricing stops, and six ways to cap it.
LLM API prices run from $0.14 to $30 per million tokens in June 2026, and agentic workloads multiply the bill. Seven free, open-source tools that make engineering teams' LLM spend measurable and attributable.
With 98% of FinOps teams now managing AI spend, LLM cost control is a 2026 priority. Here are 6 free, mostly open-source tools, from LiteLLM and Langfuse to tokencost and OpenCost, to measure LLM spend.
