feat: add Claude Opus 4.6 model support (#2204)

Reference:
- https://www.anthropic.com/news/claude-opus-4-6
- https://platform.claude.com/docs/en/about-claude/models/overview

Author: PeterDaveHello

pr_agent/algo/__init__.py

@@ -71,6 +71,7 @@
     'vertex_ai/claude-opus-4@20250514': 200000,
     'vertex_ai/claude-opus-4-1@20250805': 200000,
     'vertex_ai/claude-opus-4-5@20251101': 200000,
+    'vertex_ai/claude-opus-4-6': 200000,
     'vertex_ai/claude-3-5-sonnet@20240620': 100000,
     'vertex_ai/claude-3-5-sonnet-v2@20241022': 100000,
     'vertex_ai/claude-3-7-sonnet@20250219': 200000,
@@ -106,13 +107,15 @@
     'anthropic/claude-opus-4-20250514': 200000,
     'anthropic/claude-opus-4-1-20250805': 200000,
     'anthropic/claude-opus-4-5-20251101': 200000,
+    'anthropic/claude-opus-4-6': 200000,
     'anthropic/claude-3-5-sonnet-20240620': 100000,
     'anthropic/claude-3-5-sonnet-20241022': 100000,
     'anthropic/claude-3-7-sonnet-20250219': 200000,
     'anthropic/claude-sonnet-4-20250514': 200000,
     'anthropic/claude-sonnet-4-5-20250929': 200000,
     'claude-opus-4-1-20250805': 200000,
     'claude-opus-4-5-20251101': 200000,
+    'claude-opus-4-6': 200000,
     'claude-3-7-sonnet-20250219': 200000,
     'anthropic/claude-3-5-haiku-20241022': 100000,
     'anthropic/claude-haiku-4-5-20251001': 200000,
@@ -123,6 +126,7 @@
     'bedrock/anthropic.claude-3-sonnet-20240229-v1:0': 100000,
     'bedrock/anthropic.claude-opus-4-20250514-v1:0': 200000,
     'bedrock/anthropic.claude-opus-4-1-20250805-v1:0': 200000,
+    'bedrock/anthropic.claude-opus-4-6-v1:0': 200000,
     'bedrock/anthropic.claude-3-haiku-20240307-v1:0': 100000,
     'bedrock/anthropic.claude-3-5-haiku-20241022-v1:0': 100000,
     'bedrock/anthropic.claude-haiku-4-5-20251001-v1:0': 200000,
@@ -135,6 +139,8 @@
     "bedrock/us.anthropic.claude-opus-4-1-20250805-v1:0": 200000,
     "bedrock/global.anthropic.claude-opus-4-5-20251101-v1:0": 200000,
     "bedrock/us.anthropic.claude-opus-4-5-20251101-v1:0": 200000,
+    "bedrock/global.anthropic.claude-opus-4-6-v1:0": 200000,
+    "bedrock/us.anthropic.claude-opus-4-6-v1:0": 200000,
     "bedrock/us.anthropic.claude-3-5-sonnet-20241022-v2:0": 100000,
     "bedrock/us.anthropic.claude-haiku-4-5-20251001-v1:0": 200000,
     "bedrock/eu.anthropic.claude-haiku-4-5-20251001-v1:0": 200000,

tests/unittest/test_get_max_tokens.py

@@ -65,3 +65,26 @@ def test_model_max_tokens_with__limit(self, monkeypatch):
         expected = 10000
 
         assert get_max_tokens(model) == expected
+
+    @pytest.mark.parametrize(
+        "model",
+        [
+            "anthropic/claude-opus-4-6",
+            "claude-opus-4-6",
+            "vertex_ai/claude-opus-4-6",
+            "bedrock/anthropic.claude-opus-4-6-v1:0",
+            "bedrock/global.anthropic.claude-opus-4-6-v1:0",
+            "bedrock/us.anthropic.claude-opus-4-6-v1:0",
+        ],
+    )
+    def test_claude_opus_4_6_model_max_tokens(self, monkeypatch, model):
+        fake_settings = type('', (), {
+            'config': type('', (), {
+                'custom_model_max_tokens': 0,
+                'max_model_tokens': 0
+            })()
+        })()
+
+        monkeypatch.setattr(utils, "get_settings", lambda: fake_settings)
+
+        assert get_max_tokens(model) == 200000