From 4bef7f27fd25e115b0bd9f5c329ee719c17316e4 Mon Sep 17 00:00:00 2001
From: Lukas Geiger <lukas@um-bruch.org>
Date: Thu, 15 Oct 2026 15:23:07 +0200
Subject: [PATCH] fix(ai): use documented Claude 4.6 model IDs

Remove invalid date suffixes from Sonnet and Opus; verify actual SDK model payloads with local fixtures.

Generated-with: gpt-6.1-sol
---
 CHANGELOG.md                           |  4 +++
 src/modules/ai_assistant/ai_service.py |  4 +--
 tests/test_ai_model_ids.py             | 45 ++++++++++++++++++++++++++
 3 files changed, 51 insertions(+), 2 deletions(-)
 create mode 100644 tests/test_ai_model_ids.py

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8822ad3..d52f2e7 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,10 @@ Format basiert auf [Keep a Changelog](https://keepachangelog.com/de/1.1.0/).
 
 ## [Unreleased]
 
+### KI-Modellkennungen / AI model IDs (2026-10-15)
+- Die Claude-4.6-Modellkennungen für Sonnet und Opus verwenden das dokumentierte Format ohne Datumsanhang. Die Haiku-4.5-Kennung bleibt unverändert.
+- Regressionstests prüfen die an das SDK übergebenen Modellkennungen für Standardauswahl, Opus und Haiku mit einem Testdouble, ohne echte API-Anfragen.
+
 ### High-End-Kontrolle / High-end review (2026-10-13) [P 2026-10-13]
 - CI-Vertragstests prüfen versionierte Actions ohne Bindung an eine feste Major-Version (PR #7).
 - Die zwei persönlichen OneDrive-Rechnerpfade in der deutschen und englischen Beitragsrichtlinie durch den hostneutralen Platzhalter `<OneDrive>` ersetzt.
diff --git a/src/modules/ai_assistant/ai_service.py b/src/modules/ai_assistant/ai_service.py
index 4d6d080..8bcf321 100644
--- a/src/modules/ai_assistant/ai_service.py
+++ b/src/modules/ai_assistant/ai_service.py
@@ -14,8 +14,8 @@
 
 class AIModel(Enum):
     """Verfügbare AI-Modelle"""
-    CLAUDE_SONNET = "claude-sonnet-4-6-20250514"
-    CLAUDE_OPUS = "claude-opus-4-6-20250514"
+    CLAUDE_SONNET = "claude-sonnet-4-6"
+    CLAUDE_OPUS = "claude-opus-4-6"
     CLAUDE_HAIKU = "claude-haiku-4-5-20251001"
 
 
diff --git a/tests/test_ai_model_ids.py b/tests/test_ai_model_ids.py
new file mode 100644
index 0000000..65dd17f
--- /dev/null
+++ b/tests/test_ai_model_ids.py
@@ -0,0 +1,45 @@
+"""Verify the actual SDK payload without importing a real provider client."""
+
+import asyncio
+import sys
+from types import SimpleNamespace
+from unittest.mock import Mock
+
+import pytest
+
+from modules.ai_assistant.ai_service import AIModel, AIService
+
+
+@pytest.mark.parametrize(
+    ("selection", "expected"),
+    [
+        (None, "claude-sonnet-4-6"),
+        (AIModel.CLAUDE_OPUS, "claude-opus-4-6"),
+        (AIModel.CLAUDE_HAIKU, "claude-haiku-4-5-20251001"),
+    ],
+)
+def test_complete_sends_documented_model_id(monkeypatch, selection, expected):
+    """The default and selectable models must reach the SDK with valid IDs."""
+    create = Mock(
+        return_value=SimpleNamespace(
+            content=[SimpleNamespace(text="fixture response")],
+            model=expected,
+            usage=SimpleNamespace(input_tokens=1, output_tokens=1),
+        )
+    )
+    client = SimpleNamespace(messages=SimpleNamespace(create=create))
+    monkeypatch.setitem(
+        sys.modules, "anthropic", SimpleNamespace(Anthropic=Mock(return_value=client))
+    )
+    service = AIService(api_key="fixture-not-a-real-key")
+    if selection is not None:
+        service.set_model(selection)
+
+    result = asyncio.run(service.complete("fixture prompt", use_history=False))
+
+    assert result.success
+    create.assert_called_once()
+    assert create.call_args.kwargs["model"] == expected
+    assert create.call_args.kwargs["messages"] == [
+        {"role": "user", "content": "fixture prompt"}
+    ]