diff --git a/tests/openkal/pins.toml b/tests/openkal/pins.toml
index 61ead6df..529f4d3c 100644
--- a/tests/openkal/pins.toml
+++ b/tests/openkal/pins.toml
@@ -4,7 +4,7 @@
 # `runtime` is the C++ runtime for openkal; it pins openkal-musl exactly, and
 # openkal-musl selects the openkal implementation for each target, so this one
 # version names the whole graph.
-runtime   = "0.10.0"
+runtime   = "0.12.0"
 toolchain = "llvm@22.1.8"
 # `mcpp` here moves together with index.toml's `min_mcpp` and
 # .github/workflows/openkal-compat.yml's own MCPP_VERSION (that workflow
@@ -18,15 +18,21 @@ toolchain = "llvm@22.1.8"
 # index requires mcpp >= 2026.9.18.1 but this is mcpp 2026.9.17.3 [E0006]"
 # before a single line of the member's own source is read.
 #
-# `runtime` does NOT move here: openkal-llvm-runtime 0.11.0 (the version that
-# actually declares/consumes `[c-abi]`) is not published yet -- see the note
-# in pkgs/o/openkal-llvm-runtime.lua. Bumping `mcpp` alone, ahead of it,
-# changes nothing observable today: no package this pin resolves declares
-# `[c-abi]`. Verified locally (not merely asserted): a full run of every
-# member listed below against x86_64-linux-gnu, under 2026.9.18.1, reproduces
-# the checked-in baseline exactly -- same 27 runs / 3 fails, same three
-# members (expat, curl, cmp-module), same diagnostics character-for-character
-# past the local path prefix.
+# `runtime` MOVES HERE NOW, AND UNTIL IT DID THE WINDOWS LEG MEASURED A GRAPH
+# WITH NO `[c-abi]` IN IT. openkal-llvm-runtime 0.12.0 (openkal-musl 0.16.0,
+# openkal 0.14.0) is the first pinned graph in which a package declares the
+# block, so it is the first in which mcpp realises `presents = "posix"` at all:
+# below it the Windows target compiles as `x86_64-w64-windows-gnu` with `_WIN32`
+# defined, which is the condition every `#ifdef _WIN32` branch in the measured
+# members selects on. A result taken under 0.10.0 therefore says nothing about
+# the declaration -- it measures the behaviour the declaration exists to
+# replace. mcpp-community/mcpp#674 was opened against results of that shape.
+#
+# The two mirrors of both packages were compared byte for byte before this
+# move (GLOBAL archive against the GitCode asset, sha256 equal for
+# openkal-musl 0.16.0 and openkal-llvm-runtime 0.12.0), because a pin that
+# moves onto an unreachable or divergent asset fails every member at once and
+# reports it as a compatibility result.
 mcpp      = "2026.9.18.3"
 
 targets = ["x86_64-linux-gnu", "x86_64-windows-gnu"]