Gemini 2.5 Flash: cost, energy and CO₂ per token
What is the footprint of Gemini 2.5 Flash? Gemini 2.5 Flash emits about 681 g of CO₂e, uses 7.3 L of water and 1.6 kWh of electricity per million generated tokens. Per million input tokens: 113 g of CO₂e, 1.2 L of water, 267 Wh. Public price: €2 per million generated tokens, €0.26 for input.
Factors ecologits-0.11.3-2026-10, updated on , low confidence. Sources and equations in the methodology.
Key figures, per million tokens
| Energy | CO₂e | Water | Price | |
|---|---|---|---|---|
| Input tokens | 267 Wh | 113 g | 1.2 L | €0.26 |
| Generated tokens | 1.6 kWh | 681 g | 7.3 L | €2 |
Of the 34 models in the TokenClimate registry, Gemini 2.5 Flash ranks 17th for carbon intensity per million generated tokens, below the median (691 g). The gap with Mistral Small 4, the registry's most frugal, is still ×29.
One million generated tokens represents about 5 km in a combustion car.
Frequently asked questions
How much CO₂e for 1 million tokens with Gemini 2.5 Flash?
About 681 g per million generated tokens and 113 g per million input tokens (factors ecologits-0.11.3-2026-10 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 TokenClimate dashboard connects to your organisation's Anthropic, OpenAI or OpenRouter admin keys (stored encrypted) and measures cost and CO₂e per team and per model. You can see it in the demo: tokenclimate.com/demo. 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. (EcoLogits v0.11.3)
Infrastructure parameters
Datacenter parameters applied to this provider (the equations live in the methodology). (Elsworth et al. 2025, arXiv:2508.15734 (données Google 2024))
| PUE | 1.09 |
| Grid carbon intensity (CIF) | 0.345 kgCO₂e/kWh |
| On-site water (WUE) | 1.15 L/kWh |
| Off-site water (EWIF) | 3.13 L/kWh |
| Amortised manufacturing (embodied) | 49 gCO₂e/kWh |
Price
Public provider prices. (ai.google.dev, pricing)
Full equations and assumptions in the methodology.