OpenAI
GPT-5
Flagship reasoning + chat model.
Specs
- Provider
- OpenAI
- Family
- GPT
- Context window
- 400,000 tokens
- Max output
- 128,000 tokens
- Input price
- $1.25 / 1M
- Output price
- $10 / 1M
- Modalities
- text, image
- License
- proprietary
- Released
- Aug 7, 2025
- Training cutoff
- Oct 1, 2024
Estimated footprint
Per single text prompt (token-scaled rows assume ~1,000 tokens).
Footprint numbers are rough public estimates that vary by 10–100× across sources and depend on data-centre efficiency and local grid mix. They are shown as a low–high band with a source and date. Don't treat them as measured fact.
Energy
≈ 1.8 Wh
range 0.6–4.5 Wh
~12 s of a 9 W LED bulb
Third-party estimate (frontier-model scaling) · low confidence
Water
≈ 2 mL
range 0.7–5 mL
~0.0 s of a shower
Third-party estimate (frontier-model scaling) · low confidence
CO₂e
≈ 0.8 g
range 0.25–2.2 g
~7 m driven in a petrol car
Third-party estimate (frontier-model scaling) · low confidence
Metric sources
| Metric | Low–Mid–High | Basis | Confidence | As of | Source |
|---|---|---|---|---|---|
| co2 | 0.25 · 0.8 · 2.2 g | per prompt | low | Aug 1, 2025 | Third-party estimate (frontier-model scaling) |
| energy | 0.6 · 1.8 · 4.5 Wh | per prompt | low | Aug 1, 2025 | Third-party estimate (frontier-model scaling) |
| water | 0.7 · 2 · 5 mL | per prompt | low | Aug 1, 2025 | Third-party estimate (frontier-model scaling) |
Changelog
- Oct 6, 2026Seeded into PromptLedger reference library.