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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.
Strategic optimisation can cut LLM costs by 60 to 80 percent. Seven AI cost tools, from observability with Langfuse to prompt compression with LLMLingua, that engineering teams use to cut token spend in 2026.
