ChatGPT vs Claude

This comparison uses the current IdleForest model for ChatGPT and Claude: their category, modeled CO2 per use unit, methodology notes, key drivers, and assumptions.

Supporting comparison page

ChatGPT

150g

CO2 / HOUR

Higher emissions

Claude

140g

CO2 / HOUR

Data-backed comparison

Summary

When comparing ChatGPT and Claude, ChatGPT generates significantly more CO2 emissions per hour (150g) than Claude (140g). Both applications rely on devices, networks, and server infrastructure, which all contribute to their environmental impact.

Why the gap happens

ChatGPT is modeled at 150g CO2 per unit, while Claude is modeled at 140g, so the visible gap is 10g in the current dataset.
Both products sit in the AI category, so the difference comes from the per-product estimate and page-level methodology fields rather than a category change.
This estimate converts repeated AI interactions into an hourly footprint by combining model inference demand with the surrounding data-center overhead.
Prompt volume and response length both change inference demand.

What to act on first

Because ChatGPT is higher in the current model, start there: Consolidate related prompts into one well-scoped request.

ChatGPT is currently modeled at 10g CO2 more per unit of use than Claude.

Deep dive into their footprints

Read the full ChatGPT report Read the full Claude report

Comparison takeaways

ChatGPT is modeled at 150g CO2 per unit, while Claude is modeled at 140g, so the visible gap is 10g in the current dataset.

Both products sit in the AI category, so the difference comes from the per-product estimate and page-level methodology fields rather than a category change.

About IdleForest

IdleForest is a desktop app that plants trees in the background while your computer is idle. It uses your unused internet bandwidth to fund reforestation projects.

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