diff --git a/.chronus/changes/add-test-alternate-initial-verb-post-2026-3-18-22-38-49.md b/.chronus/changes/add-test-alternate-initial-verb-post-2026-3-18-22-38-49.md
new file mode 100644
index 00000000000..bffe050bd80
--- /dev/null
+++ b/.chronus/changes/add-test-alternate-initial-verb-post-2026-3-18-22-38-49.md
@@ -0,0 +1,7 @@
+---
+changeKind: internal
+packages:
+  - "@typespec/http-client-python"
+---
+
+Add mock API test case for the `AlternateInitialVerb` POST pagination scenario where the initial request uses POST with a filter body and subsequent next link requests use GET.
diff --git a/packages/http-client-python/generator/test/generic_mock_api_tests/asynctests/test_payload_pageable_async.py b/packages/http-client-python/generator/test/generic_mock_api_tests/asynctests/test_payload_pageable_async.py
index c14800bb7d6..f0994df97b0 100644
--- a/packages/http-client-python/generator/test/generic_mock_api_tests/asynctests/test_payload_pageable_async.py
+++ b/packages/http-client-python/generator/test/generic_mock_api_tests/asynctests/test_payload_pageable_async.py
@@ -5,6 +5,7 @@
 # --------------------------------------------------------------------------
 import pytest
 from payload.pageable.aio import PageableClient
+from payload.pageable.serverdrivenpagination.alternateinitialverb.models import Filter
 
 
 @pytest.fixture
@@ -125,3 +126,9 @@ async def test_xml_pagination_list_with_continuation(client: PageableClient):
 async def test_xml_pagination_list_with_next_link(client: PageableClient):
     result = [p async for p in client.xml_pagination.list_with_next_link()]
     assert_result(result)
+
+
+@pytest.mark.asyncio
+async def test_alternate_initial_verb_post(client: PageableClient):
+    result = [p async for p in client.server_driven_pagination.alternate_initial_verb.post(Filter(filter="foo eq bar"))]
+    assert_result(result)
diff --git a/packages/http-client-python/generator/test/generic_mock_api_tests/test_payload_pageable.py b/packages/http-client-python/generator/test/generic_mock_api_tests/test_payload_pageable.py
index 66cc77022d5..7aaf8e0ce31 100644
--- a/packages/http-client-python/generator/test/generic_mock_api_tests/test_payload_pageable.py
+++ b/packages/http-client-python/generator/test/generic_mock_api_tests/test_payload_pageable.py
@@ -5,6 +5,7 @@
 # --------------------------------------------------------------------------
 import pytest
 from payload.pageable import PageableClient
+from payload.pageable.serverdrivenpagination.alternateinitialverb.models import Filter
 
 
 @pytest.fixture
@@ -91,3 +92,8 @@ def test_xml_pagination_list_with_continuation(client: PageableClient):
 def test_xml_pagination_list_with_next_link(client: PageableClient):
     result = list(client.xml_pagination.list_with_next_link())
     assert_result(result)
+
+
+def test_alternate_initial_verb_post(client: PageableClient):
+    result = list(client.server_driven_pagination.alternate_initial_verb.post(Filter(filter="foo eq bar")))
+    assert_result(result)
diff --git a/packages/http-client-python/package-lock.json b/packages/http-client-python/package-lock.json
index b82ca429199..5ef30ee619b 100644
--- a/packages/http-client-python/package-lock.json
+++ b/packages/http-client-python/package-lock.json
@@ -29,7 +29,7 @@
         "@typespec/compiler": "^1.10.0",
         "@typespec/events": "~0.80.0",
         "@typespec/http": "^1.10.0",
-        "@typespec/http-specs": "0.1.0-alpha.35-dev.1",
+        "@typespec/http-specs": "0.1.0-alpha.35-dev.4",
         "@typespec/openapi": "^1.10.0",
         "@typespec/rest": "~0.80.0",
         "@typespec/spec-api": "0.1.0-alpha.14-dev.1",
@@ -2492,25 +2492,25 @@
       }
     },
     "node_modules/@typespec/http-specs": {
-      "version": "0.1.0-alpha.35-dev.1",
-      "resolved": "https://registry.npmjs.org/@typespec/http-specs/-/http-specs-0.1.0-alpha.35-dev.1.tgz",
-      "integrity": "sha512-sL3Q9Nmgim1YdHiKTaO1bdaUdPIV+1o1HIT8VbTfgEPresdgxJSp2Mll5uehIoiDzGZ3M11Ka/Lrdijr5VRYiA==",
+      "version": "0.1.0-alpha.35-dev.4",
+      "resolved": "https://registry.npmjs.org/@typespec/http-specs/-/http-specs-0.1.0-alpha.35-dev.4.tgz",
+      "integrity": "sha512-KI8b/wJDdWhNM8ypJEeOgl0Fj9xTxKqSQfmOUqgcQYqlaNeU+jpvqS/xD3wEOguh6YMrCUD9FG9h6mgp8409KA==",
       "dev": true,
       "license": "MIT",
       "dependencies": {
-        "@typespec/spec-api": "^0.1.0-alpha.13 || >= 0.1.0-alpha.14-dev.1",
-        "@typespec/spector": "^0.1.0-alpha.24 || >= 0.1.0-dev.0",
-        "deep-equal": "^2.2.0"
+        "@typespec/spec-api": "^0.1.0-alpha.13 || >= 0.1.0-alpha.14-dev.2",
+        "@typespec/spector": "^0.1.0-alpha.24 || >= 0.1.0-dev.2",
+        "deep-equal": "^2.2.3"
       },
       "engines": {
         "node": ">=16.0.0"
       },
       "peerDependencies": {
-        "@typespec/compiler": "^1.10.0 || >= 1.11.0-dev.0",
-        "@typespec/http": "^1.10.0 || >= 1.11.0-dev.0",
-        "@typespec/rest": "^0.80.0 || >= 0.81.0-dev.0",
-        "@typespec/versioning": "^0.80.0 || >= 0.81.0-dev.0",
-        "@typespec/xml": "^0.80.0 || >= 0.81.0-dev.0"
+        "@typespec/compiler": "^1.10.0 || >= 1.11.0-dev.4",
+        "@typespec/http": "^1.10.0 || >= 1.11.0-dev.2",
+        "@typespec/rest": "^0.80.0 || >= 0.81.0-dev.1",
+        "@typespec/versioning": "^0.80.0 || >= 0.81.0-dev.1",
+        "@typespec/xml": "^0.80.0 || >= 0.81.0-dev.1"
       }
     },
     "node_modules/@typespec/openapi": {
diff --git a/packages/http-client-python/package.json b/packages/http-client-python/package.json
index 9acd8f7a3c4..4fea573c5bf 100644
--- a/packages/http-client-python/package.json
+++ b/packages/http-client-python/package.json
@@ -94,7 +94,7 @@
     "@typespec/sse": "~0.80.0",
     "@typespec/streams": "~0.80.0",
     "@typespec/xml": "~0.80.0",
-    "@typespec/http-specs": "0.1.0-alpha.35-dev.1",
+    "@typespec/http-specs": "0.1.0-alpha.35-dev.4",
     "@types/js-yaml": "~4.0.5",
     "@types/node": "~25.0.2",
     "@types/semver": "7.5.8",