AI / LLM cost monitoring

See what your AI actually costs before the invoice does

CostMon connects to Anthropic's Admin cost report. It normalizes your Claude API spend into the same daily view as the rest of your stack. A runaway agent loop shows up within days. You do not wait a month.

Start free See how it works

Anthropic Admin API, live today

AI spend behaves nothing like a cloud bill. One misconfigured agent loop can fan out thousands of extra model calls in an afternoon. By the time it shows up on the Anthropic invoice, the damage is already done. Most teams building on Claude have no daily signal at all, just a monthly total that arrives too late to explain, let alone prevent.

Cost anatomy

What actually drives your Anthropic bill

Input vs. output token rates: Claude models price input and output tokens separately, and output costs meaningfully more per token. A workload that generates longer responses costs more per call even at the same request volume.
Agent loops multiply calls, and cost climbs with them: An agent stuck in a retry or reasoning loop doesn't just use more tokens per call. It multiplies the number of calls, so a single misconfiguration can fan out into thousands of billed requests in an afternoon.
Prompt caching changes the input rate: Reusing a long system prompt or context via prompt caching bills the cached portion at a reduced rate versus a full-price input token. Skip it, and the same context is billed at full price on every call.
Model choice moves the bill more than volume does: Switching a workload to a larger, more capable model changes the per-token rate non-linearly. The same call volume can cost several times more with no change in usage pattern.

Alerts

How CostMon warns you about Anthropic spend

CostMon's default rule watches every service on your account from the day you connect it. An alert always shows up in your CostMon feed. Add an email, Slack, or webhook channel to send it somewhere else too.

Anomaly rulesource = anthropic, service = claude-opus-4-6, metric = tokens

A workload's daily token count jumping from a retry loop or a switch to a larger Claude model.

Budgetsource = anthropic

A monthly budget on total Claude spend catches prompt caching quietly losing its discount on a repeated context.

Sample alert, illustrative

From: alerts@costmon.com
Subject: CostMon alert: Anomaly: anthropic / claude-opus-4-6 spend spike

Anomaly: anthropic / claude-opus-4-6 spend spike

anthropic / claude-opus-4-6 was $165.00 on 2026-07-02 — 83% above its 14-day average of $90.00.

Severity: warning
Occurred on: 2026-07-02

To find what to cut, the recommendations list flags idle spend and commitment gaps to review.

Why CostMon

Built for Anthropic spend, from day one

Per-model, per-agent visibility

See Claude API spend broken down the way you build, by model and by workload, instead of one opaque monthly total on an invoice.

Catch the agent loop before the invoice

One agent retry loop can repeat the same Claude call thousands of times in an afternoon. A daily per-model breakdown shows that call count climb on day one.

One view, next to your cloud spend

Claude spend sits beside your AWS bill in the same daily view. When an agent release moves both the model bill and the compute bill, you see the two lines together.

Read-only, cost-report-scoped credentials

CostMon connects via the Anthropic Admin API's cost report: read-only access to cost data only, never to prompts, completions, or your workspace.

Cached rateprompt caching bills cached tokens below full price
~16 daysearlier than the invoice
Admin APIAnthropic cost report pull, daily

Getting started

From API key to first alert, for Anthropic

01
Connect the Anthropic Admin API
Add a read-only Anthropic Admin API key scoped to the cost report endpoint. CostMon never sees prompts, completions, or account settings.
02
CostMon syncs and normalizes
Claude API cost data is pulled on a schedule and reconciled into the same normalized model as AWS and every other provider you connect.
03
See the spike, then get the alert
Watch Claude spend by model, day by day. A retry loop or a switch to a bigger model lifts the token count, and a rule fires.

FAQ

Common questions about the Anthropic connector

Which AI providers does CostMon support today?

Five AI connectors are live today. Anthropic, OpenAI and Amazon Bedrock are three of them. Vertex AI / Gemini and Helicone are the others. Manual entries let you attribute spend from any other provider.

Can CostMon break down AI spend by model or agent?

Yes. Claude API cost data syncs in with its underlying detail intact. You can see trends by model, by workload, or grouped into cost buckets by team or project.

How does CostMon get Anthropic cost data?

Through the Anthropic Admin API's cost report endpoint, read-only and scoped to billing data. CostMon never requests access to prompts, completions, or your Anthropic workspace itself.

How is this different from the Anthropic Console?

The Anthropic Console shows Claude usage on its own. CostMon normalizes that same cost data alongside AWS and every other provider you connect. AI spend sits in one daily view next to the rest of your stack. You skip the separate login.

What does the Anthropic connector cost?

A flat monthly rate per plan. CostMon never charges a percentage of your AI spend or the savings it helps you find. Free includes 2 connectors; Professional and Enterprise include unlimited connectors.

Connectors

Cloud, AI, and SaaS: all in one place

AWS, GCP, and Azure for cloud. Anthropic, OpenAI, Amazon Bedrock, Vertex AI / Gemini, and Helicone for AI and LLM spend. Snowflake and Databricks for the data cloud. Datadog, GitHub, and Vercel for the rest of the stack. Add CSV import for any tool without a native connector. That's 14 connectors, all normalized into the same unified view.

Connect it. Get the first alert.

Connect a provider and CostMon builds a daily baseline for it. From there, a spike reaches your team as an alert.

Start free See how to connect a provider