diff --git a/src/ci/github-actions/jobs.yml b/src/ci/github-actions/jobs.yml
index 4384ec7676975..9312f4293ff01 100644
--- a/src/ci/github-actions/jobs.yml
+++ b/src/ci/github-actions/jobs.yml
@@ -23,7 +23,11 @@ runners:
     <<: *base-job
 
   - &job-macos
-    os: macos-14
+    os: macos-15
+    <<: *base-job
+
+  - &job-macos-x86_64
+    os: macos-15-intel
     <<: *base-job
 
   - &job-windows
@@ -90,6 +94,22 @@ envs:
   pr:
     PR_CI_JOB: 1
 
+  env-macos-xcode: &env-macos-xcode
+    SELECT_XCODE: /Applications/Xcode_26.app
+    USE_XCODE_CLANG: 1
+
+  # Ensure that host tooling is tested on our minimum supported macOS
+  # version.
+  env-macos-x86_64-target: &env-macos-x86_64-target
+    MACOSX_DEPLOYMENT_TARGET: 10.12
+    MACOSX_STD_DEPLOYMENT_TARGET: 10.12
+
+  # Aarch64 tooling only needs to support macOS 11.0 as this is the
+  # first OS version to support the hardware.
+  env-macos-aarch64-target: &env-macos-aarch64-target
+    MACOSX_DEPLOYMENT_TARGET: 11.0
+    MACOSX_STD_DEPLOYMENT_TARGET: 11.0
+
 jobs:
   dist-x86_64-linux: &job-dist-x86_64-linux
     name: dist-x86_64-linux
@@ -427,26 +447,45 @@ auto:
         --set rust.jemalloc
         --set rust.lto=thin
         --set rust.codegen-units=1
-      # Ensure that host tooling is built to support our minimum support macOS version.
-      MACOSX_DEPLOYMENT_TARGET: 10.12
-      MACOSX_STD_DEPLOYMENT_TARGET: 10.12
-      SELECT_XCODE: /Applications/Xcode_15.4.app
-      USE_XCODE_CLANG: 1
+      <<: [*env-macos-x86_64-target, *env-macos-xcode]
       DIST_REQUIRE_ALL_TOOLS: 1
       CODEGEN_BACKENDS: llvm,cranelift
     <<: *job-macos
 
+  - name: x86_64-apple
+    env:
+      SCRIPT: >-
+        ./x.py test
+        --stage 2
+        --host=x86_64-apple-darwin
+        --target=x86_64-apple-darwin
+        --set llvm.download-ci-llvm=false
+        &&
+        ./x.py test
+        --stage 2
+        --host=x86_64-apple-darwin
+        --target=x86_64-apple-darwin
+        src/tools/cargo
+      RUST_CONFIGURE_ARGS: >-
+        --enable-profiler
+        --enable-sanitizers
+        --set rust.jemalloc
+      # The x86_64 macOS builders are relatively slow, so we disable
+      # extra assertions/checks to get back a bit of speed.
+      NO_LLVM_ASSERTIONS: 1
+      NO_DEBUG_ASSERTIONS: 1
+      NO_OVERFLOW_CHECKS: 1
+      <<: [*env-macos-x86_64-target, *env-macos-xcode]
+    <<: *job-macos-x86_64
+
   - name: dist-apple-various
     env:
       SCRIPT: ./x.py dist bootstrap --include-default-paths --host='' --target=aarch64-apple-ios,x86_64-apple-ios,aarch64-apple-ios-sim,aarch64-apple-ios-macabi,x86_64-apple-ios-macabi
       # Mac Catalyst cannot currently compile the sanitizer:
       # https://github.com/rust-lang/rust/issues/129069
       RUST_CONFIGURE_ARGS: --enable-sanitizers --enable-profiler --set rust.jemalloc --set target.aarch64-apple-ios-macabi.sanitizers=false --set target.x86_64-apple-ios-macabi.sanitizers=false
-      # Ensure that host tooling is built to support our minimum support macOS version.
-      # FIXME(madsmtm): This might be redundant, as we're not building host tooling here (?)
-      MACOSX_DEPLOYMENT_TARGET: 10.12
-      MACOSX_STD_DEPLOYMENT_TARGET: 10.12
-      SELECT_XCODE: /Applications/Xcode_15.2.app
+      # FIXME(madsmtm): Setting the target might be redundant, as we're not building host tooling here (?)
+      <<: [*env-macos-x86_64-target, *env-macos-xcode]
     <<: *job-macos
 
   - name: dist-aarch64-apple
@@ -463,31 +502,29 @@ auto:
         --set rust.jemalloc
         --set rust.lto=thin
         --set rust.codegen-units=1
-      # Aarch64 tooling only needs to support macOS 11.0 and up as nothing else
-      # supports the hardware.
-      MACOSX_DEPLOYMENT_TARGET: 11.0
-      MACOSX_STD_DEPLOYMENT_TARGET: 11.0
-      SELECT_XCODE: /Applications/Xcode_15.4.app
-      USE_XCODE_CLANG: 1
+      <<: [*env-macos-aarch64-target, *env-macos-xcode]
       DIST_REQUIRE_ALL_TOOLS: 1
       CODEGEN_BACKENDS: llvm,cranelift
     <<: *job-macos
 
   - name: aarch64-apple
     env:
-      SCRIPT: >
-        ./x.py --stage 2 test --host=aarch64-apple-darwin --target=aarch64-apple-darwin &&
-        ./x.py --stage 2 test --host=aarch64-apple-darwin --target=aarch64-apple-darwin src/tools/cargo
+      SCRIPT: >-
+        ./x.py test
+        --stage 2
+        --host=aarch64-apple-darwin
+        --target=aarch64-apple-darwin
+        &&
+        ./x.py test
+        --stage 2
+        --host=aarch64-apple-darwin
+        --target=aarch64-apple-darwin
+        src/tools/cargo
       RUST_CONFIGURE_ARGS: >-
         --enable-sanitizers
         --enable-profiler
         --set rust.jemalloc
-      SELECT_XCODE: /Applications/Xcode_15.4.app
-      USE_XCODE_CLANG: 1
-      # Aarch64 tooling only needs to support macOS 11.0 and up as nothing else
-      # supports the hardware, so only need to test it there.
-      MACOSX_DEPLOYMENT_TARGET: 11.0
-      MACOSX_STD_DEPLOYMENT_TARGET: 11.0
+      <<: [*env-macos-aarch64-target, *env-macos-xcode]
     <<: *job-macos
 
   ######################