GPT-6 Astra: cost, energy and CO₂ per token
What is the footprint of GPT-6 Astra? GPT-6 Astra emits about 4.3 kg of CO₂e, uses 50.7 L of water and 9.8 kWh of electricity per million generated tokens. Per million input tokens: 712 g of CO₂e, 8.4 L of water, 1.6 kWh. Public price: €44 per million generated tokens, €9 for input.
Factors tokenclimate-v6-2026-09, updated on , low confidence. Sources and equations in the methodology.
Key figures, per million tokens
| Energy | CO₂e | Water | Price | |
|---|---|---|---|---|
| Input tokens | 1.6 kWh | 712 g | 8.4 L | €9 |
| Generated tokens | 9.8 kWh | 4.3 kg | 50.7 L | €44 |
GPT-6 Astra emits 485% more than the median of the 23 models in the TokenClimate registry (731 g per million generated tokens), that is ×189 compared with Mistral Small 4, the most frugal.
One million generated tokens represents about 30 km in a combustion car and 1 shower.
Frequently asked questions
How much CO₂e for 1 million tokens with GPT-6 Astra?
About 4.3 kg per million generated tokens and 712 g per million input tokens (factors tokenclimate-v6-2026-09 of the TokenClimate registry).
Where do these figures come from?
Factors published in TokenClimate's versioned registry, each with its citation on this page. The full equations and parameters are in the public methodology, at tokenclimate.com/en/methodology.
What is the confidence level?
Low confidence: extrapolated from another model, or estimated by a parametric tool.
How can you measure your organisation's real usage?
The AI usage report computes twelve months of cost and CO₂e from your organisation's Anthropic admin key (the key is never stored), ready in about fifteen minutes: tokenclimate.com/bilan/en. Locally, the open source plugin claude-carbon measures a Claude Code session.
Sources and method
Energy per token
The per-token energy factor behind the figures above, published with its citation.
Infrastructure parameters
Datacenter parameters applied to this provider (the equations live in the methodology). (Jegham et al., arXiv:2505.09598 (v6))
| PUE | 1.12 |
| Grid carbon intensity (CIF) | 0.35 kgCO₂e/kWh |
| On-site water (WUE) | 0.3 L/kWh |
| Off-site water (EWIF) | 4.35 L/kWh |
| Amortised manufacturing (embodied) | 44 gCO₂e/kWh |
Price
Public provider prices. (developers.openai.com, pricing)
Full equations and assumptions in the methodology.