### Benchmarks

Comparison of run times of the current version of MODFLOW 6 (6.7.0) to the previous version (6.6.3). The current example models available from the [MODFLOW 6 Examples GitHub Repository](https://github.com/MODFLOW-ORG/modflow6-examples) are used to compare run times. Simulations that fail are indicated by '--'. The percent difference, where calculated, is relative to the simulation run time for the previous version. Percent differences for example problems with short run times (less than 30 seconds) may not be significant.

MODFLOW 6 compiled Feb  6 2026 14:01:42 with GCC version 12.3.0.


| Example Problem | Current Version 6.7.0 | Previous Version 6.6.3 | Percent difference |
| :---------- | :----------: | :----------: | :----------: |
| ex-gwt-mt3dsupp631/mf6gwf | 0.008 Seconds | 0.008 Seconds | 0.00% |
| ex-gwt-mt3dsupp631/mf6gwt | 0.036 Seconds | -- | -- |
| ex-gwt-mt3dms-p04c | 6.674 Seconds | 6.934 Seconds | -3.75% |
| ex-gwt-mt3dms-p04b | 9.946 Seconds | 9.782 Seconds | 1.68% |
| ex-gwf-twri01 | 0.024 Seconds | 0.023 Seconds | 4.35% |
| ex-gwe-prt/gwf | 0.067 Seconds | 0.066 Seconds | 1.52% |
| ex-gwe-prt/prt | 0.055 Seconds | -- | -- |
| ex-gwe-prt/gwe | 30.956 Seconds | -- | -- |
| ex-gwf-nwt-p03b | 2.183 Seconds | 2.168 Seconds | 0.69% |
| ex-gwt-mt3dsupp632c/mf6gwf | 0.008 Seconds | 0.008 Seconds | 0.00% |
| ex-gwt-mt3dsupp632c/mf6gwt | 0.034 Seconds | -- | -- |
| ex-gwt-hecht-mendez-b/mf6gwf | 1.548 Seconds | 1.536 Seconds | 0.78% |
| ex-gwt-hecht-mendez-b/mf6gwt | 1 Minutes,  3.957 Seconds | -- | -- |
| ex-gwt-hecht-mendez-c/mf6gwf | 1.736 Seconds | 1.711 Seconds | 1.46% |
| ex-gwt-hecht-mendez-c/mf6gwt | 1 Minutes, 17.590 Seconds | -- | -- |
| ex-gwf-bcf2ss-p01a | 0.015 Seconds | 0.015 Seconds | 0.00% |
| ex-gwt-henry-a | 6.547 Seconds | 6.526 Seconds | 0.32% |
| ex-gwf-drn-p01b | 2.158 Seconds | 2.159 Seconds | -0.05% |
| ex-gwt-mt3dms-p01c | 0.040 Seconds | 0.040 Seconds | 0.00% |
| ex-gwt-mt3dms-p02e/mf6gwf | 0.270 Seconds | 0.292 Seconds | -7.53% |
| ex-gwt-mt3dms-p02e/mf6gwt | 0.382 Seconds | -- | -- |
| ex-gwf-csub-p03a | 10.501 Seconds | 10.848 Seconds | -3.20% |
| ex-gwf-csub-p01 | 0.131 Seconds | 0.138 Seconds | -5.07% |
| ex-gwf-maw-p01a | 0.908 Seconds | 0.908 Seconds | 0.00% |
| ex-gwf-csub-p03b | 11.019 Seconds | 11.288 Seconds | -2.38% |
| ex-gwf-disvmesh | 0.174 Seconds | 0.173 Seconds | 0.58% |
| ex-gwf-sfr-p01 | 0.203 Seconds | 0.212 Seconds | -4.25% |
| ex-gwt-mt3dms-p02f/mf6gwf | 0.269 Seconds | 0.292 Seconds | -7.88% |
| ex-gwt-mt3dms-p02f/mf6gwt | 0.416 Seconds | -- | -- |
| ex-gwf-nwt-p02b | 4.458 Seconds | 3.913 Seconds | 13.93% |
| ex-gwf-zaidel | 0.008 Seconds | 0.008 Seconds | 0.00% |
| ex-gwf-u1gwfgwf-s4 | 0.020 Seconds | 0.019 Seconds | 5.26% |
| ex-gwf-bcf2ss-p02a | 0.013 Seconds | 0.013 Seconds | 0.00% |
| ex-gwt-henry-b | 6.736 Seconds | 6.710 Seconds | 0.39% |
| ex-gwt-mt3dms-p03 | 1.683 Seconds | 1.672 Seconds | 0.66% |
| ex-gwt-mt3dsupp632a/mf6gwf | 0.009 Seconds | 0.008 Seconds | 12.50% |
| ex-gwt-mt3dsupp632a/mf6gwt | 0.047 Seconds | -- | -- |
| ex-gwf-lgr | 0.089 Seconds | 0.087 Seconds | 2.30% |
| ex-gwt-moc3d-p02/mf6gwf | 0.100 Seconds | 0.099 Seconds | 1.01% |
| ex-gwt-moc3d-p02/mf6gwt | 9.696 Seconds | -- | -- |
| ex-gwt-moc3d-p01b/mf6gwf | 0.007 Seconds | 0.007 Seconds | 0.00% |
| ex-gwt-moc3d-p01b/mf6gwt | 0.042 Seconds | -- | -- |
| ex-gwf-bump-p01a | 0.421 Seconds | 0.422 Seconds | -0.24% |
| ex-gwf-lak-p02 | 7.231 Seconds | 7.027 Seconds | 2.90% |
| ex-gwt-mt3dms-p02d/mf6gwf | 0.276 Seconds | 0.295 Seconds | -6.44% |
| ex-gwt-mt3dms-p02d/mf6gwt | 0.393 Seconds | -- | -- |
| ex-gwt-mt3dms-p09 | 1.509 Seconds | 1.522 Seconds | -0.85% |
| ex-gwt-uzt-2d-b | 10.350 Seconds | 10.226 Seconds | 1.21% |
| ex-gwt-mt3dms-p05 | 0.189 Seconds | 0.188 Seconds | 0.53% |
| ex-gwt-rotate | 3 Minutes, 36.545 Seconds | 3 Minutes, 35.046 Seconds | 0.70% |
| ex-gwf-maw-p03a | 0.092 Seconds | 0.090 Seconds | 2.22% |
| ex-gwf-spbc | 0.129 Seconds | 0.128 Seconds | 0.78% |
| ex-gwt-mt3dms-p07 | 0.399 Seconds | 0.394 Seconds | 1.27% |
| ex-gwt-mt3dms-p08 | 16.167 Seconds | 16.292 Seconds | -0.77% |
| ex-gwf-lgrv-gr | 28.245 Seconds | 28.192 Seconds | 0.19% |
| ex-gwf-hanix | 0.035 Seconds | 0.034 Seconds | 2.94% |
| ex-gwf-nwt-p02a | 7.175 Seconds | 7.117 Seconds | 0.81% |
| ex-gwt-mt3dsupp82/mf6gwf | 0.015 Seconds | 0.015 Seconds | 0.00% |
| ex-gwt-mt3dsupp82/mf6gwt | 0.143 Seconds | -- | -- |
| ex-gwf-whirl | 0.092 Seconds | 0.090 Seconds | 2.22% |
| ex-gwe-danckwerts | 1.476 Seconds | 1.472 Seconds | 0.27% |
| hb-005 | 0.408 Seconds | 0.411 Seconds | -0.73% |
| es-001 | 0.431 Seconds | 0.439 Seconds | -1.82% |
| hb-001 | 0.407 Seconds | 0.410 Seconds | -0.73% |
| es-050 | 0.435 Seconds | 0.436 Seconds | -0.23% |
| es-010 | 0.437 Seconds | 0.443 Seconds | -1.35% |
| hb-100 | 0.406 Seconds | 0.406 Seconds | 0.00% |
| es-002 | 0.434 Seconds | 0.444 Seconds | -2.25% |
| es-100 | 0.434 Seconds | 0.435 Seconds | -0.23% |
| hb-050 | 0.405 Seconds | 0.407 Seconds | -0.49% |
| hb-010 | 0.409 Seconds | 0.408 Seconds | 0.25% |
| hb-002 | 0.401 Seconds | 0.410 Seconds | -2.20% |
| es-020 | 0.434 Seconds | 0.449 Seconds | -3.34% |
| es-005 | 0.429 Seconds | 0.443 Seconds | -3.16% |
| hb-020 | 0.402 Seconds | 0.410 Seconds | -1.95% |
| ex-gwt-moc3d-p01a/mf6gwf | 0.009 Seconds | 0.007 Seconds | 28.57% |
| ex-gwt-moc3d-p01a/mf6gwt | 0.042 Seconds | -- | -- |
| ex-gwf-fhb | 0.011 Seconds | 0.011 Seconds | 0.00% |
| ex-gwf-lak-p01 | 7.640 Seconds | 7.412 Seconds | 3.08% |
| ex-gwt-keating/mf6gwf | 5.452 Seconds | 5.416 Seconds | 0.66% |
| ex-gwt-keating/mf6prt | 0.093 Seconds | -- | -- |
| ex-gwt-keating/mf6gwt | 42.122 Seconds | -- | -- |
| gwf_triangle | 0.059 Seconds | 0.058 Seconds | 1.72% |
| gwf_voronoi | 0.104 Seconds | 0.103 Seconds | 0.97% |
| gwf_structured | 0.061 Seconds | 0.060 Seconds | 1.67% |
| gwt_triangle_square-wave_utvd | 3.321 Seconds | -- | -- |
| gwt_triangle_sin2-wave_central | 0.525 Seconds | -- | -- |
| gwt_triangle_sin2-wave_utvd | 3.033 Seconds | -- | -- |
| gwt_triangle_sin2-wave_upstream | 0.489 Seconds | -- | -- |
| gwt_voronoi_sin2-wave_upstream | 0.810 Seconds | -- | -- |
| gwt_voronoi_step-wave_upstream | 0.800 Seconds | -- | -- |
| gwt_structured_sin2-wave_upstream | 0.221 Seconds | -- | -- |
| gwt_structured_sin2-wave_utvd | 1.503 Seconds | -- | -- |
| gwt_triangle_square-wave_upstream | 0.496 Seconds | -- | -- |
| gwt_voronoi_square-wave_upstream | 0.804 Seconds | -- | -- |
| gwt_structured_square-wave_tvd | 1.306 Seconds | -- | -- |
| gwt_voronoi_sin2-wave_utvd | 3.444 Seconds | -- | -- |
| gwt_structured_step-wave_upstream | 0.225 Seconds | -- | -- |
| gwt_structured_step-wave_tvd | 0.953 Seconds | -- | -- |
| gwt_triangle_step-wave_utvd | 3.095 Seconds | -- | -- |
| gwt_structured_square-wave_utvd | 2.098 Seconds | -- | -- |
| gwt_voronoi_square-wave_central | 0.890 Seconds | -- | -- |
| gwt_structured_square-wave_central | 0.299 Seconds | -- | -- |
| gwt_structured_square-wave_upstream | 0.226 Seconds | -- | -- |
| gwt_triangle_step-wave_central | 0.548 Seconds | -- | -- |
| gwt_voronoi_sin2-wave_tvd | 3.765 Seconds | -- | -- |
| gwt_voronoi_sin2-wave_central | 0.882 Seconds | -- | -- |
| gwt_structured_sin2-wave_tvd | 1.194 Seconds | -- | -- |
| gwt_voronoi_step-wave_tvd | 3.802 Seconds | -- | -- |
| gwt_structured_step-wave_central | 0.287 Seconds | -- | -- |
| gwt_triangle_step-wave_upstream | 0.494 Seconds | -- | -- |
| gwt_triangle_step-wave_tvd | 2.302 Seconds | -- | -- |
| gwt_triangle_square-wave_central | 0.530 Seconds | -- | -- |
| gwt_voronoi_square-wave_tvd | 3.964 Seconds | -- | -- |
| gwt_voronoi_step-wave_utvd | 3.630 Seconds | -- | -- |
| gwt_voronoi_step-wave_central | 0.861 Seconds | -- | -- |
| gwt_structured_sin2-wave_central | 0.292 Seconds | -- | -- |
| gwt_voronoi_square-wave_utvd | 3.605 Seconds | -- | -- |
| gwt_triangle_square-wave_tvd | 2.264 Seconds | -- | -- |
| gwt_triangle_sin2-wave_tvd | 2.249 Seconds | -- | -- |
| gwt_structured_step-wave_utvd | 1.317 Seconds | -- | -- |
| ex-gwt-mt3dms-p06 | 3.667 Seconds | 3.661 Seconds | 0.16% |
| ex-gwt-mt3dms-p02b/mf6gwf | 0.271 Seconds | 0.296 Seconds | -8.45% |
| ex-gwt-mt3dms-p02b/mf6gwt | 0.410 Seconds | -- | -- |
| ex-gwe-radial-slow/mf6gwf | 0.720 Seconds | 0.711 Seconds | 1.27% |
| mf6gwe-b | 42.105 Seconds | -- | -- |
| ex-gwf-lgrv-gc | 0.280 Seconds | 0.277 Seconds | 1.08% |
| ex-gwe-geotherm/mf6gwf | 0.955 Seconds | 0.932 Seconds | 2.47% |
| ex-gwe-geotherm/mf6gwe | 32.634 Seconds | -- | -- |
| ex-gwf-u1gwfgwf-s3 | 0.021 Seconds | 0.020 Seconds | 5.00% |
| ex-gwf-maw-p02 | 2.315 Seconds | 2.300 Seconds | 0.65% |
| ex-gwt-moc3d-p02tg/mf6gwf | 0.621 Seconds | 0.591 Seconds | 5.08% |
| ex-gwt-moc3d-p02tg/mf6gwt | 19.423 Seconds | -- | -- |
| ex-gwt-mt3dms-p01b | 0.039 Seconds | 0.041 Seconds | -4.88% |
| ex-gwf-csub-p04 | 1.947 Seconds | 1.951 Seconds | -0.21% |
| ex-gwt-gwtgwt-p10 | 1 Minutes,  5.496 Seconds | 1 Minutes,  4.898 Seconds | 0.92% |
| ex-gwf-sfr-pindersauera | 1.402 Seconds | 1.405 Seconds | -0.21% |
| ex-gwf-advtidal | 0.535 Seconds | 0.539 Seconds | -0.74% |
| ex-gwf-lgrv-lgr | 6.139 Seconds | 6.136 Seconds | 0.05% |
| ex-prt-mp7-p03/gwf | 0.053 Seconds | 0.052 Seconds | 1.92% |
| ex-prt-mp7-p03/prt | 0.164 Seconds | -- | -- |
| ex-gwf-toth | 0.135 Seconds | 0.135 Seconds | 0.00% |
| ex-gwt-mt3dms-p02a/mf6gwf | 0.268 Seconds | 0.294 Seconds | -8.84% |
| ex-gwt-mt3dms-p02a/mf6gwt | 0.476 Seconds | -- | -- |
| ex-gwf-hanic | 0.017 Seconds | 0.017 Seconds | 0.00% |
| ex-gwf-maw-p03c | 0.092 Seconds | 0.092 Seconds | 0.00% |
| ex-gwf-hanir | 0.017 Seconds | 0.016 Seconds | 6.25% |
| ex-gwe-vsc | 8.462 Seconds | 8.513 Seconds | -0.60% |
| ex-gwt-saltlake | 15.814 Seconds | 15.432 Seconds | 2.48% |
| ex-gwf-u1gwfgwf-s2 | 0.016 Seconds | 0.014 Seconds | 14.29% |
| ex-gwf-u1disv-x | 0.010 Seconds | 0.010 Seconds | 0.00% |
| ex-gwf-sfr-pindersauerb | 2.067 Seconds | 2.070 Seconds | -0.14% |
| ex-gwf-u1gwfgwf-s1 | 0.015 Seconds | 0.014 Seconds | 7.14% |
| ex-gwe-bhe/mf6gwf | 0.031 Seconds | 0.031 Seconds | 0.00% |
| ex-gwe-bhe/mf6gwe | 4.642 Seconds | -- | -- |
| ex-gwt-stallman | 9.819 Seconds | 9.877 Seconds | -0.59% |
| ex-gwe-barends/mf6gwf | 0.111 Seconds | 0.109 Seconds | 1.83% |
| ex-gwe-barends/mf6gwe | 4.669 Seconds | -- | -- |
| ex-gwf-bump-p01c | 0.071 Seconds | 0.070 Seconds | 1.43% |
| ex-gwt-mt3dms-p01a | 0.037 Seconds | 0.038 Seconds | -2.63% |
| ex-gwt-mt3dms-p10 | 52.720 Seconds | 52.322 Seconds | 0.76% |
| ex-gwt-synthetic-valley/mf6gwf | 3.182 Seconds | 3.165 Seconds | 0.54% |
| ex-gwt-synthetic-valley/mf6gwt | 27.972 Seconds | -- | -- |
| ex-gwf-curvilin | 0.020 Seconds | 0.019 Seconds | 5.26% |
| ex-gwf-bump-p01b | 0.106 Seconds | 0.101 Seconds | 4.95% |
| ex-gwf-drn-p01a | 1.552 Seconds | 1.588 Seconds | -2.27% |
| ex-gwf-maw-p01b | 0.927 Seconds | 0.915 Seconds | 1.31% |
| ex-gwf-csub-p02b | 0.036 Seconds | 0.038 Seconds | -5.26% |
| ex-gwf-u1disv | 0.009 Seconds | 0.009 Seconds | 0.00% |
| ex-gwf-sagehen | 2 Minutes,  6.489 Seconds | 2 Minutes,  5.594 Seconds | 0.71% |
| ex-gwt-mt3dms-p01d | 0.041 Seconds | 0.043 Seconds | -4.65% |
| ex-gwt-mt3dsupp632b/mf6gwf | 0.008 Seconds | 0.008 Seconds | 0.00% |
| ex-gwt-mt3dsupp632b/mf6gwt | 0.048 Seconds | -- | -- |
| ex-prt-mp7-p01/gwf | 0.021 Seconds | 0.020 Seconds | 5.00% |
| ex-prt-mp7-p01/prt | 0.458 Seconds | -- | -- |
| ex-gwf-rad-disu | 0.054 Seconds | 0.055 Seconds | -1.82% |
| ex-gwf-maw-p03b | 0.088 Seconds | 0.088 Seconds | 0.00% |
| ex-gwt-mt3dms-p02c/mf6gwf | 0.270 Seconds | 0.295 Seconds | -8.47% |
| ex-gwt-mt3dms-p02c/mf6gwt | 0.331 Seconds | -- | -- |
| ex-gwe-ates | 15.324 Seconds | 15.301 Seconds | 0.15% |
| ex-gwf-nwt-p03a | 0.212 Seconds | 0.209 Seconds | 1.44% |
| ex-gwf-sfr-p01b | 8.594 Seconds | 8.545 Seconds | 0.57% |
| ex-gwf-capture | 0.020 Seconds | 0.019 Seconds | 5.26% |
| ex-gwt-prudic2004t2/mf6gwf | 1.719 Seconds | 1.705 Seconds | 0.82% |
| ex-gwt-prudic2004t2/mf6gwt | 22.592 Seconds | -- | -- |
| ex-gwt-moc3d-p01d/mf6gwf | 0.008 Seconds | 0.008 Seconds | 0.00% |
| ex-gwt-moc3d-p01d/mf6gwt | 0.043 Seconds | -- | -- |
| ex-gwf-curve-90 | 0.013 Seconds | 0.012 Seconds | 8.33% |
| ex-gwt-uzt-2d-a | 10.291 Seconds | 10.209 Seconds | 0.80% |
| ex-gwt-mt3dms-p04a | 6.576 Seconds | 6.581 Seconds | -0.08% |
| ex-gwf-csub-p02a | 0.034 Seconds | 0.036 Seconds | -5.56% |
| ex-gwt-moc3d-p01c/mf6gwf | 0.008 Seconds | 0.007 Seconds | 14.29% |
| ex-gwt-moc3d-p01c/mf6gwt | 0.046 Seconds | -- | -- |
| Total simulation time | 12 Minutes, 6.871 Seconds | 12 Minutes, 2.665 Seconds | 0.58% |