Joules-to-GDP: How Much Economic Value Do AI Systems Produce per Unit of Energy?
Organizations: Stanford University · University of California, Berkeley · The University of Texas at Austin
Abstract
An AI system can produce more economically valuable work while delivering less value for the energy it consumes. We therefore ask: How much economic value does an AI system create per unit of energy consumed? We formalize economic value in two ways: (1) net dollar value, the output's dollar value minus AI-system execution cost, and (2) time saving, the expert's completion time minus the AI system's completion time. Dividing each by measured end-to-end energy yields Net Value per Joule (NVJ) and Time Saving per Joule (TSJ), reported in USD/MJ and hours/MJ. We study 220 public GDPval tasks across 44 occupations, serving five open-weight models locally and evaluating four accelerator types. First, the occupation groups where AI systems succeed most often, deliver the greatest dollar value, or save the most time do not necessarily provide the greatest economic return per joule. For example, among the tested tasks, engineering work delivers about 10% more net dollar value per task than software development. Yet software development delivers about 27% more net value per joule. Second, GLM 5.2 delivers the highest average net dollar value, at $72.27 per task using 0.430 MJ, equivalent in energy to about four hours of active laptop use. By contrast, Gemma 4 31B delivers 56% of that net dollar value using just 23% of the energy, achieving approximately 2.5 times the NVJ and 2.8 times the TSJ. Third, across four single-accelerator deployments, Qwen3.6-27B's NVJ varies by a factor of 4.32 and TSJ by 9.27, with B200 leading both. Additionally, one and eight H100s deliver similar net dollar value, but eight reduce completion time by 22% at 3.24 times the energy. Our framework makes output value and expert time saving under an energy budget explicit objectives for improving models, accelerators, and software, while offering a new basis for assessing AI's potential economic effect on occupational work.
Figures & tables
| GDP-weighted task averages | Net value per | |||||
|---|---|---|---|---|---|---|
| Model | Execution cost (USD) | Completion time (min) | Energy (MJ) | dollar of AI cost (USD/USD) | AI hour (USD/hour) | megajoule (USD/MJ) |
| GLM 5.2 | 1.92 | 22.7 | 0.430 | 37.69 | 191.3 | 168.1 |
| Qwen3.6-27B | 4.12 | 51.0 | 0.516 | 15.46 | 75.0 | 123.4 |
| Gemma 4 31B | 0.86 | 7.7 | 0.097 | 47.38 | 316.9 | 417.5 |
| GPT-OSS 120B | 1.98 | 22.2 | 0.137 | 19.09 | 102.1 | 275.7 |
| GPT-OSS 20B | 1.12 | 15.3 | 0.103 | 31.03 | 136.3 | 336.0 |
Appendix figures & tables25 assets
Supplementary material from the paper’s appendix.
Appendix
| Pair | Exact agreement | Binary win–tie agreement |
|---|---|---|
| Gemini–Haiku | 77.2% | 79.2% |
| Gemini–GPT-5 mini | 74.0% | 76.4% |
| Haiku–GPT-5 mini | 72.3% | 72.8% |
| Model and accelerator | Inference | Tensor parallelism | Concurrent requests | Context limit (tokens) | Output limit (tokens) |
|---|---|---|---|---|---|
| GLM 5.2, 8 H200 | vLLM | TP8 | 20 | 131,072 | 32,768 |
| Qwen3.6-27B, 8 H100 | vLLM | TP8 | 20 | 131,072 | 32,768 |
| Gemma 4 31B, 8 H100 | vLLM | TP8 | 20 | 131,072 | 32,768 |
| GPT-OSS 120B, 8 H100 | vLLM | TP8 | 20 | 131,072 | 32,768 |
| GPT-OSS 20B, 8 H100 | vLLM | TP8 | 20 | 131,072 | 32,768 |
| Qwen3.6-27B, 1 B200 | vLLM | TP1 | 20 | 131,072 | 32,768 |
| Category | Energy (MJ) | NVJ (USD/MJ) | TSJ (hours/MJ) |
|---|---|---|---|
| Computer & Mathematical | 0.355 / 0.337 | 523.8 / 551.6 | 7.29 / 7.67 |
| Architecture & Engineering | 0.495 / 0.597 | 413.9 / 343.2 | 7.89 / 6.54 |
| Management | 0.360 / 0.349 | 374.6 / 387.0 | 6.75 / 6.97 |
| Protective Service | 0.225 / 0.229 | 278.1 / 272.9 | 4.96 / 4.86 |
| Production | 0.550 / 0.786 | 221.1 / 154.6 | 6.12 / 4.28 |
| Community & Social Service | 0.282 / 0.363 | 188.5 / 146.3 | 6.16 / 4.78 |
| AI execution cost (USD) | NVJ (USD/MJ) | ||||
|---|---|---|---|---|---|
| Category | CoreWeave | AWS | GCP | CoreWeave | GCP |
| Architecture & Eng. | 1.677 | 2.104 | 2.819 | 414.8 | 412.5 |
| Arts & Media | 1.582 | 1.986 | 2.660 | 104.7 | 102.3 |
| Business & Financial | 1.731 | 2.172 | 2.911 | 146.4 | 144.1 |
| Community & Social | 0.983 | 1.233 | 1.652 | 189.4 | 187.0 |
| Computer & Math | 1.245 | 1.562 | 2.092 | 524.6 | 522.3 |
| Category | Win–tie (%) | Win–tie pp/MJ |
|---|---|---|
| Architecture & Eng. | 69.00 [38.01, 91.00] | 139.43 [75.84, 229.50] |
| Arts & Media | 46.09 [28.27, 66.09] | 102.44 [74.15, 136.56] |
| Business & Financial | 56.81 [37.93, 74.97] | 112.42 [72.81, 168.62] |
| Community & Social | 60.00 [20.00, 100.00] | 212.94 [60.19, 390.26] |
| Computer & Math | 80.00 [40.00, 100.00] | 225.08 [122.22, 312.77] |
| Healthcare | 28.23 [8.02, 63.12] | 63.48 [21.77, 107.89] |
| Category | Net dollar value (USD/task) | Time saving (hours/task) |
|---|---|---|
| Architecture & Eng. | 204.84 [108.93, 288.94] | 3.905 [2.055, 5.569] |
| Arts & Media | 46.71 [20.18, 79.15] | 1.219 [0.554, 2.028] |
| Business & Financial | 73.57 [44.46, 106.85] | 1.677 [0.975, 2.508] |
| Community & Social | 53.12 [12.78, 93.45] | 1.735 [0.423, 3.047] |
| Computer & Math | 186.16 [68.11, 337.13] | 2.589 [0.924, 4.844] |
| Healthcare | 43.50 [14.21, 86.93] | 0.742 [0.230, 1.541] |
| Category | NVJ (USD/MJ) | TSJ (hours/MJ) |
|---|---|---|
| Architecture & Eng. | 413.90 [196.34, 744.61] | 7.890 [3.660, 14.397] |
| Arts & Media | 103.82 [55.09, 167.63] | 2.710 [1.459, 4.508] |
| Business & Financial | 145.57 [83.22, 239.58] | 3.318 [1.820, 5.627] |
| Community & Social | 188.50 [43.10, 382.42] | 6.158 [1.426, 12.522] |
| Computer & Math | 523.76 [235.93, 770.14] | 7.285 [3.182, 11.080] |
| Healthcare | 97.84 [38.77, 196.72] | 1.669 [0.643, 3.049] |
| Category | Output dollar value (USD) | Expert time (h) | AI time (h) | Time saving (h) |
|---|---|---|---|---|
| Architecture & Eng. | 299.90 | 6.11 | 0.45 | 5.66 |
| Arts & Media | 105.66 | 3.02 | 0.37 | 2.65 |
| Business & Financial | 133.31 | 3.34 | 0.39 | 2.95 |
| Community & Social | 90.58 | 3.22 | 0.32 | 2.89 |
| Computer & Math | 234.65 | 3.67 | 0.43 | 3.24 |
| Healthcare | 162.29 | 3.04 | 0.41 | 2.63 |
| Category | Win–tie pp/MJ rank | NVJ rank | TSJ rank |
|---|---|---|---|
| Architecture & Eng. | 8 | 2 | 1 |
| Arts & Media | 10 | 10 | 9 |
| Business & Financial | 9 | 8 | 8 |
| Community & Social | 5 | 6 | 5 |
| Computer & Math | 3 | 1 | 2 |
| Healthcare | 12 | 11 | 12 |
| Category | Win–tie (%) | Credited value (USD) | AI cost (USD) | Time saving (hours) | Energy (MJ) | AI time (hours) |
|---|---|---|---|---|---|---|
| Architecture & Eng. | 69.0 | 206.94 | 2.104 | 3.905 | 0.495 | 0.467 |
| Arts & Media | 46.1 | 48.70 | 1.986 | 1.219 | 0.450 | 0.384 |
| Business & Financial | 56.8 | 75.74 | 2.172 | 1.677 | 0.505 | 0.443 |
| Community & Social | 60.0 | 54.35 | 1.233 | 1.735 | 0.282 | 0.321 |
| Computer & Math | 80.0 | 187.72 | 1.562 | 2.589 | 0.355 | 0.420 |
| Healthcare | 28.2 | 45.81 | 2.306 | 0.742 | 0.445 | 0.299 |
| Rank | Category | Net value/AI dollar (USD/USD) | Net value/AI hour (USD/hour) |
|---|---|---|---|
| 1 | Computer & Math | 119.2 | 442.9 |
| 2 | Architecture & Eng. | 97.4 | 438.4 |
| 3 | Management | 85.6 | 423.6 |
| 4 | Protective Service | 64.0 | 225.8 |
| 5 | Production | 52.1 | 199.3 |
| 6 | Community & Social | 43.1 | 165.7 |
| Occupation | Tasks | Win–tie (%) | NVJ (USD/MJ) | TSJ (h/MJ) |
|---|---|---|---|---|
| Accountants and Auditors | 5 | 40.0 | 31.5 | 0.53 |
| Administrative Services Managers | 5 | 100.0 | 369.8 | 6.60 |
| Audio and Video Technicians | 5 | 40.0 | 22.7 | 0.53 |
| Buyers and Purchasing Agents | 5 | 40.0 | 249.3 | 6.69 |
| Child, Family, and School Social Workers | 5 | 60.0 | 188.5 | 6.16 |
| Compliance Officers | 5 | 80.0 | 333.9 | 8.45 |
| Ranking | Median | 5th–95th | Leader retained |
|---|---|---|---|
| Win–tie rate per MJ | 0.951 | 0.896–0.989 | 51.0% |
| NVJ | 0.962 | 0.824–0.995 | 76.5% |
| TSJ | 0.918 | 0.813–0.973 | 40.4% |
| Judgment reference | Time reference | NVJ (USD/MJ) | TSJ (hours/MJ) |
|---|---|---|---|
| Expert-only | Expert-only | 168.11 [126.00, 222.43] | 3.823 [2.870, 5.021] |
| Expert-with-AI | Expert-only | 69.07 [46.04, 95.84] | 1.818 [1.256, 2.486] |
| Expert-only | Expert-with-AI | 84.90 [64.79, 107.49] | 1.990 [1.432, 2.639] |
| Expert-with-AI | Expert-with-AI | 50.04 [30.77, 70.41] | 1.340 [0.814, 1.888] |
| Change and fixed quantity | NVJ reduction (%) | TSJ reduction (%) |
|---|---|---|
| Judgments; expert-only reference times fixed | 58.9 [43.0, 72.7] | 52.5 [37.0, 66.5] |
| Times; expert-only reference decisions fixed | 49.5 [33.1, 63.0] | 47.9 [29.1, 63.2] |
| Times; expert-with-AI reference decisions fixed | 27.5 [-1.7, 50.8] | 26.3 [-6.2, 51.8] |
| Judgments; expert-with-AI reference times fixed | 41.1 [20.9, 60.4] | 32.7 [7.2, 54.9] |
| Both judgments and times | 70.2 [54.4, 82.5] | 65.0 [46.3, 79.4] |
| Policy | Output value (USD) | AI cost (USD) | Energy (MJ) | NVJ [95% CI] | TSJ [95% CI] | Net value/ AI cost |
|---|---|---|---|---|---|---|
| 74.19 | 1.92 | 0.430 | 168.1 [126.0, 222.4] | 3.82 [2.87, 5.02] | 37.69 | |
| 85.75 | 4.00 | 0.891 | 91.8 [71.0, 118.6] | 2.13 [1.65, 2.72] | 20.45 | |
| 89.41 | 5.98 | 1.332 | 62.7 [48.9, 80.0] | 1.46 [1.16, 1.85] | 13.96 | |
| 93.42 | 7.92 | 1.760 | 48.6 [38.3, 61.7] | 1.16 [0.93, 1.45] | 10.79 |
| Policy | Output value (USD) | AI cost (USD) | Energy (MJ) | NVJ [95% CI] | TSJ [95% CI] | Net value/ AI cost |
|---|---|---|---|---|---|---|
| 93.42 | 7.92 | 1.760 | 48.6 [38.3, 61.7] | 1.16 [0.93, 1.45] | 10.79 | |
| 81.58 | 7.92 | 1.760 | 41.9 [31.7, 54.9] | 1.02 [0.79, 1.31] | 9.30 | |
| 71.53 | 7.92 | 1.760 | 36.1 [26.3, 48.8] | 0.89 [0.67, 1.17] | 8.03 | |
| 57.12 | 7.92 | 1.760 | 28.0 [18.4, 40.5] | 0.72 [0.50, 0.99] | 6.21 |
| Policy | Output value (USD) | AI cost (USD) | Energy (MJ) | NVJ [95% CI] | TSJ [95% CI] | Net value/ AI cost |
|---|---|---|---|---|---|---|
| 35.11 | 7.92 | 1.760 | 15.4 [10.5, 20.7] | 0.46 [0.32, 0.61] | 3.43 | |
| 27.70 | 7.92 | 1.760 | 11.2 [6.1, 16.7] | 0.37 [0.23, 0.52] | 2.50 | |
| 7.71 | 7.92 | 1.760 | -0.1 [-1.9, 2.1] | 0.10 [0.05, 0.16] | -0.03 | |
| 3.48 | 7.92 | 1.760 | -2.5 [-3.7, -1.1] | 0.05 [0.01, 0.09] | -0.56 |
| Transition | Time saving (hours) | Time saving (%) | Energy (MJ) | TSJ (hours/MJ) |
|---|---|---|---|---|
| Expert-only expert-with-AI | 0.21 [-0.04, 0.45] | 23.0 [-5.3, 45.9] | – | – |
| Expert-with-AI AI system | 0.58 [0.34, 0.83] | 83.7 [77.8, 87.1] | 0.430 | 1.340 [0.814, 1.888] |
| Expert-only AI system | 0.78 [0.55, 1.03] | 87.4 [84.4, 89.8] | 0.430 | 1.818 [1.256, 2.486] |
| Model | GPUs | Output value (USD) | AI cost (USD) | Energy (MJ) | NVJ [95% CI] | TSJ [95% CI] | Net value/ AI cost |
|---|---|---|---|---|---|---|---|
| GLM 5.2 | 8 H200 | 74.19 | 1.92 | 0.430 | 168.1 [126.0, 222.4] | 3.82 [2.87, 5.02] | 37.69 |
| Qwen3.6-27B | 8 H100 | 67.81 | 4.12 | 0.516 | 123.4 [92.2, 163.2] | 2.43 [1.73, 3.28] | 15.46 |
| Gemma 4 31B | 8 H100 | 41.38 | 0.86 | 0.097 | 417.5 [239.5, 642.9] | 10.86 [6.76, 15.72] | 47.38 |
| GPT-OSS 120B | 8 H100 | 39.73 | 1.98 | 0.137 | 275.7 [152.5, 429.2] | 6.38 [3.71, 9.63] | 19.09 |
| GPT-OSS 20B | 8 H100 | 35.88 | 1.12 | 0.103 | 336.0 [180.7, 536.4] | 8.26 [4.67, 12.59] | 31.03 |
AI and Labor
AI and labor studies how artificial intelligence changes jobs, wages, skills, hiring, and the organization and quality of work.
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