prompt-lab

A/B test your prompts, side by side

The prompt— both variants answer this

⌘ + ↵ to run

A

Variant A

Sonnet 4.5

idle

Model

System prompt

Temperature · 1.0

Variant A's response will appear here.

—

output

—

cost

—

ttfb

—

time

VS

B

Variant B

Sonnet 4.5

idle

Model

System prompt

Temperature · 1.0

Variant B's response will appear here.

—

output

—

cost

—

ttfb

—

time

VerdictRun both variants to compare.

Cost

—vs—

Total time

—vs—

First token

—vs—

Output

—vs—