Why compare prompts on dollars, not just tokens?

Output-heavy models price completion tokens higher. A shorter prompt that triggers longer answers can still cost more.

B2B / Engineering

Free tool

Prompt Token Diff

Diff two prompts on token count and projected monthly dollars. Ideal for prompt compression reviews and “does this system prompt pay for itself?” checks.

1Fill inputs
2Run
3Copy / export

Inputs

Required fields on the left

Prompt A (baseline)

Prompt B (candidate)

Requests / sec

Output tokens

Model ids (comma-separated)

Results

Appears after you run

Compare two prompts

Shorter prompts often save more than model shopping alone.

How it works

From inputs to a decision

Diff two prompts on token count and projected monthly dollars. Ideal for prompt compression reviews and “does this system prompt pay for itself?” checks.

01
Paste prompt A and prompt B.
02
Choose models and traffic assumptions.
03
Run the diff to see token and $ deltas.

Tips for better results

Keep temperature and tools identical when comparing production prompts.
Use the same prompt pack and RPS when comparing models.
Estimates use list prices — negotiate enterprise rates separately.

Frequently asked questions

Why compare prompts on dollars, not just tokens?: Output-heavy models price completion tokens higher. A shorter prompt that triggers longer answers can still cost more.

Keep measuring in the same cluster — or jump to the next decision.