Haskell thread says heavy agentic coding may equal one round-trip flight after 400 hours
tomjaguarpaw · x · 2026-07-29
A Haskell GHC mailing-list thread tries to estimate the carbon cost of heavy agentic coding and argues the footprint is far smaller than one earlier back-of-the-envelope calculation suggested.
- The discussion cites a paper on LLM energy, water, and carbon footprint.
- One participant corrects a unit mistake: the cited number was 29 Wh, not 29 kW.
- Using a median figure of 0.34 Wh per query and an assumption of one query every 10 seconds, the thread estimates roughly 0.12 kWh/hour.
- At about 0.3 kg CO2e per kWh, that comes out to around 0.036 kg CO2e/hour.
- On that basis, roughly 400 hours of use would equal a return flight from Austin to Zurich.
The thread is less a definitive study than a live correction-and-recalculation exercise, but it surfaces a concrete debate about the real emissions cost of agentic coding.
More from coding & agent
- Five open-source tools promise 60%–95% fewer tokens for Claude and Codex agents — CodeByPoonam · 2026-07-29
- Codex Micro should be voice-first, with Git and PR controls replacing approve/reject — rudrank · 2026-07-29
- Agent teams should use deterministic checks first, then LLM judges, then humans — yoobinray · 2026-07-29
- Matt Pocock turns a wayfinding map into a full Cmd+K palette spec — mattpocockuk · 2026-07-29
- Codex can now handle trims, subtitles, masking and title cards in basic video edits — gabrielchua · 2026-07-29
- Anthropic warns Opus 5 may leak fake tool calls when thinking is off — heypearlai · 2026-07-29