Same standard of work. About 23× the energy.
Qwen3.6 27B scores higher than Claude Sonnet 4.5 on Epoch's Capabilities Index — 147.47 against 147.02, across 58 benchmarks covering coding, agents, long context and writing — while using about 23× less energy per answer. Qwen3.6 27B has not faced human head-to-head voting, where Claude Sonnet 4.5 carries 79,687 votes — worth weighing.
| Qwen3.6 27B | Claude Sonnet 4.5 | |
|---|---|---|
| Energy per answer | 0.351 Wh | 7.97 Wh |
| Same carbon as driving | under 1 m | 15 m |
| Energy rank | 38 of 134 | 92 of 134 |
| Capability (science questions) | 84.8 | 73.7 |
| Epoch Capabilities Index | 147.47 | 147.02 |
| Human vote rating | — | 1438 |
| Votes cast | — | 79,687 |
| Confidence | Calculated | Day-one estimate |
| Released | 2026-04-22 | 2025-09-29 |
Energy is calculated the same way for every model on this site, from public data and calibrated against laboratory measurement — accurate to roughly a factor of two to three, which is why we only ever state a difference of 5× or more. Capability is a science-question test; the Capabilities Index is a composite over 58 benchmarks; the vote rating comes from blind human comparisons. The full method is here.