Blog
Claude Code & ChatGPT Codex cost deep-dives
Longer-form pieces on usage limits, token waste, and what actually works to stretch the plan you already pay for. For the evergreen reference material, see the guides and the docs.
Extra Headroom in production: Input -34%, Output -33% across 183 Claude Code users
Production data from 183 Claude Code users over one week: Extra Headroom removed 3.50B input tokens and avoided 132M output tokens, $27,268 at list prices.
How Headroom makes AI coding more sustainable
AI coding agents are energy hungry. Headroom kept 4.76 billion tokens a week out of data centers, about 19-192 kWh a year per user. Method and sources shown.
How to present token savings percentages honestly
One day of real agent traffic, scored three ways: 15%, 38%, or 87%. Which savings percentage means anything, and why cache reads stay out of the denominator.
Hit the Claude Code weekly limit by Wednesday? Here's what's eating it
Why heavy Claude Code users burn the weekly limit in two or three days (sub-agents, tool output, re-read files) and what to do this week.
Sub-agents are why your Claude Code weekly limit vanished
Sub-agents spin up fresh contexts that don't inherit the prompt cache, so multi-agent runs re-buy context. How the tax works and how to shrink it.
Codex now meters by tokens: why your ChatGPT plan drains faster
Since April 2026, ChatGPT Plus, Pro, and Business meter Codex by tokens instead of messages. What changed, who it hurts, and how to adapt without upgrading.
Stop reading, start measuring
Download Headroom, run a Claude Code or ChatGPT Codex task you already do every day, and compare the token count before and after.
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