diff --git a/sys-cluster/codipack/Manifest b/sys-cluster/codipack/Manifest
new file mode 100644
index 0000000000000..a9570935f842f
--- /dev/null
+++ b/sys-cluster/codipack/Manifest
@@ -0,0 +1 @@
+DIST codipack-3.1.0.tar.gz 679346 BLAKE2B cb3a48aae839480ff54898b05f3a4c954534ea5ab008a8562c5878b9870a84b5a05d4351c08dbf3a7c4b92841da2537e530a85fdce27455881007d19be883f8c SHA512 58f3a8fc7a98a4d8e4cc49075336e0fb0c28a06eaa41e6faeaa9c84533ee8a4b545d8047138df9acf7796900e0e4ab6b97ac694ae990dbed7088b8a991425ae4
diff --git a/sys-cluster/codipack/codipack-3.1.0.ebuild b/sys-cluster/codipack/codipack-3.1.0.ebuild
new file mode 100644
index 0000000000000..2265f13918e7b
--- /dev/null
+++ b/sys-cluster/codipack/codipack-3.1.0.ebuild
@@ -0,0 +1,27 @@
+# Copyright 1999-2026 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+inherit cmake
+
+MY_PN="CoDiPack"
+
+DESCRIPTION="Fast gradient evaluation in C++ based on Expression Templates"
+HOMEPAGE="https://scicomp.rptu.de/software/codi/ https://github.com/SciCompKL/CoDiPack"
+
+if [[ ${PV} == *9999 ]]; then
+	inherit git-r3
+	EGIT_REPO_URI="https://github.com/SciCompKL/${MY_PN}.git"
+else
+	SRC_URI="
+		https://github.com/SciCompKL/${MY_PN}/archive/v${PV}.tar.gz -> ${P}.tar.gz
+	"
+	S="${WORKDIR}/${MY_PN}-${PV}"
+	KEYWORDS="~amd64"
+fi
+
+LICENSE="GPL-3"
+SLOT="0"
+
+RESTRICT="test"
diff --git a/sys-cluster/codipack/codipack-9999.ebuild b/sys-cluster/codipack/codipack-9999.ebuild
new file mode 100644
index 0000000000000..2265f13918e7b
--- /dev/null
+++ b/sys-cluster/codipack/codipack-9999.ebuild
@@ -0,0 +1,27 @@
+# Copyright 1999-2026 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+inherit cmake
+
+MY_PN="CoDiPack"
+
+DESCRIPTION="Fast gradient evaluation in C++ based on Expression Templates"
+HOMEPAGE="https://scicomp.rptu.de/software/codi/ https://github.com/SciCompKL/CoDiPack"
+
+if [[ ${PV} == *9999 ]]; then
+	inherit git-r3
+	EGIT_REPO_URI="https://github.com/SciCompKL/${MY_PN}.git"
+else
+	SRC_URI="
+		https://github.com/SciCompKL/${MY_PN}/archive/v${PV}.tar.gz -> ${P}.tar.gz
+	"
+	S="${WORKDIR}/${MY_PN}-${PV}"
+	KEYWORDS="~amd64"
+fi
+
+LICENSE="GPL-3"
+SLOT="0"
+
+RESTRICT="test"
diff --git a/sys-cluster/codipack/metadata.xml b/sys-cluster/codipack/metadata.xml
new file mode 100644
index 0000000000000..365b6c1496d27
--- /dev/null
+++ b/sys-cluster/codipack/metadata.xml
@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE pkgmetadata SYSTEM "https://www.gentoo.org/dtd/metadata.dtd">
+<pkgmetadata>
+	<maintainer type="project">
+		<email>sci@gentoo.org</email>
+		<name>Gentoo Science Project</name>
+	</maintainer>
+	<upstream>
+		<remote-id type="github">SciCompKL/CoDiPack</remote-id>
+	</upstream>
+</pkgmetadata>