Aerospike
Aerospike shipped a coordinated CVE train across four release branches in one afternoon
Comparison · DevOps
CP2K vs SU2
A side-by-side editorial comparison of CP2K and SU2 — release velocity, themes, recent moves, and the top alternatives to consider.
Shared themes:gpu-acceleration
CP2K vs SU2: at a glance
What is CP2K?
CP2K is rebuilding a legacy Fortran DFT code around GPUs, ML potentials, and k-points
CP2K ships twice a year and each release lands a wide slate of quantum-chemistry methods rather than a single headline feature. The last two years have been dominated by three parallel threads: pushing k-point support into methods that were previously gamma-point only, wiring in external machine-learning and GPU libraries, and modernizing the build. The 2026.2 release is the first where GPU work reaches the exact-exchange hot path and where grand-canonical SCF opens electrified-interface simulation.
What is SU2?
SU2 is growing from an aerodynamics solver into a coupled multiphysics optimizer
SU2 ships two or three releases a year under the same Harrier codename it has used since 8.0, each one a long list of contributed features rather than a single theme. The multiphysics work is the clearest thread: thermal expansion and centrifugal forces reached the FEA solver in 8.2.0, a coupled thermoelasticity solver followed, and 8.5.0 declares that coupling fully functional and adds its adjoint. Turbulence modelling gets steady attention in parallel, most recently a grey-area mitigation strategy for detached-eddy simulation.
CP2K vs SU2: editorial side-by-side
CP2K
3.8DEVOPS
CP2K is rebuilding a legacy Fortran DFT code around GPUs, ML potentials, and k-points
◆ Current state
CP2K ships twice a year and each release lands a wide slate of quantum-chemistry methods rather than a single headline feature. The last two years have been dominated by three parallel threads: pushing k-point support into methods that were previously gamma-point only, wiring in external machine-learning and GPU libraries, and modernizing the build. The 2026.2 release is the first where GPU work reaches the exact-exchange hot path and where grand-canonical SCF opens electrified-interface simulation.
◆ Where it's heading
The code is converging on a plugin-heavy architecture: DeePMD-kit, NequIP, DFTD4, SIRIUS, greenX, GauXC and now libGint all arrive as external libraries CP2K orchestrates rather than reimplements. Build modernization finished on schedule — the Makefile was deprecated in 2025.2 and deleted in 2026.1 — and the same discipline is visible in the steady removal of superseded modules. Method coverage is being made uniform across periodic and molecular paths, with k-points the recurring gap being closed release after release.
◆ Prediction
Expect 2027.1 to continue the k-point sweep into the remaining gamma-point-only analyses and to broaden libGint's CUDA exchange beyond its initial path. The release notes flag FFTW3 as a likely hard dependency, so the next breaking change is probably build-side rather than scientific.
SU2
0.0DEVOPS
SU2 is growing from an aerodynamics solver into a coupled multiphysics optimizer
◆ Current state
SU2 ships two or three releases a year under the same Harrier codename it has used since 8.0, each one a long list of contributed features rather than a single theme. The multiphysics work is the clearest thread: thermal expansion and centrifugal forces reached the FEA solver in 8.2.0, a coupled thermoelasticity solver followed, and 8.5.0 declares that coupling fully functional and adds its adjoint. Turbulence modelling gets steady attention in parallel, most recently a grey-area mitigation strategy for detached-eddy simulation.
◆ Where it's heading
Two directions are visible in the contribution pattern. Adjoint capability is being extended to each new physics as it lands, which matters because gradient-based design optimization is what distinguishes SU2 from a general-purpose solver — a coupled solver without an adjoint is only half the feature. Meanwhile the numerics substrate is being reworked underneath: FGCRODR replacing GMRES for Newton-Krylov adjoints, PaStiX 6, multigrid tuning, better default compiler flags, and an early GPU port of the FGMRES solver contributed through Google Summer of Code. Machine learning enters narrowly, through data-driven and physics-informed fluid models rather than as a general capability.
◆ Prediction
The GPU work so far covers one linear solver and is still labelled experimental, so the plausible next step is extending it to more of the solve rather than a new physics module. Expect the adjoint-follows-physics pattern to continue with whatever coupling lands next.
Alternatives to CP2K and SU2
Other DevOps products tracked by Sparkpulse, ranked by recent ship velocity. Each card links to a full editorial trajectory and lets you pivot into a head-to-head comparison with either CP2K or SU2.
Firebird
Firebird maintains three release branches at once and ships the same fixes to all of them
GeoTools
GeoTools is migrating off dead Java imaging infrastructure that the whole GeoServer stack sits on
Psi4
Psi4 is closing the gap with ORCA on the methods that decide which code a lab installs
libosmium
libosmium is a stable OSM parsing library whose main work now is shedding old dependencies
OpenMM
OpenMM keeps opening new simulation domains while pushing more of the run onto the GPU
Recent activity from CP2K and SU2
Latest ship moves from both products, interleaved chronologically. ⚡ = editorial spark.
- 10d agoCP2KCP2K 2026.2: CUDA exact exchange and grand-canonical SCF ⚡
- 3mo agoSU2SU2 8.5.0 completes thermoelastic coupling and adds its adjoint
- 6mo agoCP2KCP2K 2026.1 adds MiMiC multiscale interface, drops the Makefile
- 7mo agoSU2SU2 8.4.0 adds the FGCRODR solver and SST roughness boundaries
- 11mo agoSU2SU2 8.3.0 lands a CUDA port of FGMRES and RBF mesh deformation
- 1y agoCP2KCP2K 2025.2 ships GFN-xTB and RIXS, last Makefile release
- 1y agoSU2SU2 8.2.0 adds a coupled thermoelasticity solver and PINN fluid models
- 1y agoCP2KCP2K 2025.1 adds Bethe-Salpeter optical spectra and Harris/EHT
- 1y agoSU2SU2 8.1.0 adds solid-to-solid conjugate heat transfer and custom inlets
- 1y agoCP2KCP2K 2024.3 patches an MPI stall in MD runs
- 1y agoCP2KCP2K 2024.2 adds DeePMD-kit, DFTD4 and OpenCL GPU support
- 2y agoSU2SU2 8.0.1 adds actuator-disk BEM, fixes CoDiPack adjoint locking
Frequently asked questions
What is the difference between CP2K and SU2?
Both compete on the same themes — gpu-acceleration — within DevOps. CP2K is currently shipping more aggressively (velocity 3.8 vs 0.0), with 1 editorial sparks in the last 30 days against 0. See the at-a-glance table above for a side-by-side breakdown of velocity, recent sparks, and editorial themes.
Is CP2K better than SU2?
Sparkpulse doesn't pick a winner — we score release velocity, not feature parity. CP2K is currently shipping more aggressively (velocity 3.8 vs 0.0), with 1 editorial sparks in the last 30 days against 0. For your specific use case, the alternatives sections above list other DevOps products to evaluate alongside.
What are the best alternatives to CP2K?
Top CP2K alternatives in DevOps are ranked by recent ship velocity. Browse the "CP2K alternatives" section above for the current picks, or visit /alternatives/cp2k for the full list with editorial commentary on each.
What are the best alternatives to SU2?
Top SU2 alternatives in DevOps are ranked by recent ship velocity. Browse the "SU2 alternatives" section above for the current picks, or visit /alternatives/su2 for the full list with editorial commentary on each.