Tool

Estimate an AI API bill before the invoice.

Pick a model, how many requests you send in a day, and the average input and output tokens. The figure is standard list price. It is not your provider's invoice, and it does not include cache reads, batch discounts, or long-context premiums.

Prices as of October 25, 2026. OpenAI and Anthropic numbers are from their pricing pages. OpenRouter numbers are the top-provider prompt and completion prices from their model API that day. For these models they matched the provider list. OpenRouter can route a request to another provider, and that price can differ.

Model

Requests per day

Average input tokens

Average output tokens

Estimated daily cost

$0.55

$16.50 over 30 days

Same traffic at 10×

$5.50

$165.00 over 30 days if a loop keeps that pace

If a loop held 10× for a month, that's $165.00. Team is $49/mo and can kill the key automatically.

OpenAI GPT-4o list price: $2.5 per million input tokens and $10 per million output tokens. Cache, batch, and long-context rates are not included. A month here is 30 days.

Set a daily cap free

Start 14-day Team trial

Card asked on the next step, at Stripe.

JavaScript is off. At the default (OpenAI GPT-4o, 100 requests, 1,000 input tokens, 300 output tokens) the estimate is $0.55 per day and $16.50 over 30 days. Ten times that traffic is $5.50 per day.

List prices used

Provider	Model	Input / 1M	Output / 1M
OpenAI	GPT-4o	$2.5	$10
OpenAI	GPT-4o mini	$0.15	$0.6
OpenAI	GPT-5	$1.25	$10
OpenAI	GPT-5 mini	$0.25	$2
OpenAI	GPT-4.1	$2	$8
Anthropic	Claude Sonnet 5	$2	$10
Anthropic	Claude Sonnet 4.6	$3	$15
Anthropic	Claude Haiku 4.5	$1	$5
Anthropic	Claude Opus 4.6	$5	$25
OpenRouter	GPT-4o	$2.5	$10
OpenRouter	GPT-5	$1.25	$10
OpenRouter	Claude Sonnet 4.6	$3	$15
OpenRouter	Claude Haiku 4.5	$1	$5
OpenRouter	Claude Opus 4.6	$5	$25

Sources

An estimate does not stop the key. Set a daily cap free and BillCurfew emails you when a key crosses it.