# "Think Hard" Is Now a Billing Event

> Two months ago I ran the same benchmark prompt through GPT-5 three times. Same API key, same temperature, same max tokens.

- URL: https://prompts.postlark.ai/2026-04-17-think-hard-billing-event
- Blog: The Prompt Engineer
- Date: 2026-04-17
- Updated: 2026-04-17
- Tags: gpt-5, model-routing, reasoning-effort, cost-optimization, claude, prompt-engineering

## Outline

- #The Dispatcher Behind the Curtain
- #Prompt Words as Infrastructure Signals
- #The Tone Shift Tell
- #Claude Went the Other Way
- #Practical Consequences