From 4f9125a5f9a51d33037536dfbc21b0295acbc8a3 Mon Sep 17 00:00:00 2001
From: Daniel Han <danielhanchen@gmail.com>
Date: Tue, 26 May 2026 05:48:17 +0000
Subject: [PATCH] Pin Claude 4.7 sampling-removed regex with backend test (PR
 #5711)
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Guards against drift between the backend _ANTHROPIC_4_7_SAMPLING_REMOVED
regex and the frontend ANTHROPIC_4_7_SAMPLING_REMOVED_REGEX added in the
previous commit. If a future patch widens one without the other the panel
will either silently strip a knob the user moved or 400 on a knob the UI
should have hidden — both bad UX.

Test pins the canonical 4.7 id shapes (opus/sonnet/haiku) including dated
snapshots, and the non-4.7 ids that must NOT match (4-6, 4-5, 4-71,
future 5, gpt-4o, etc.). Sampling-params suite now 60 passing
(previously 59).
---
 .../tests/test_sampling_params_routing.py     | 37 +++++++++++++++++++
 1 file changed, 37 insertions(+)

diff --git a/studio/backend/tests/test_sampling_params_routing.py b/studio/backend/tests/test_sampling_params_routing.py
index 1a0b3fed60..1727d01028 100644
--- a/studio/backend/tests/test_sampling_params_routing.py
+++ b/studio/backend/tests/test_sampling_params_routing.py
@@ -999,3 +999,40 @@ def test_local_anthropic_passthrough_helpers_accept_parallel_tool_calls():
         parallel_tool_calls = False,
     )
     assert body.get("parallel_tool_calls") is False, body
+
+
+def test_anthropic_4_7_sampling_removed_regex_matches_expected_ids():
+    """Pin the canonical Claude 4.7 model-id shape so the frontend
+    ANTHROPIC_4_7_SAMPLING_REMOVED_REGEX in
+    studio/frontend/src/features/chat/provider-capabilities.ts stays
+    in lockstep with the backend strip in
+    external_provider._stream_anthropic.
+
+    Drift would mean the panel either silently strips a knob the user
+    moved (UI shows, wire drops) or the wire 400s after the user moved
+    a knob the UI should have hidden. Both are user-visible bugs.
+    """
+    from core.inference.external_provider import (
+        _ANTHROPIC_4_7_SAMPLING_REMOVED as RX,
+    )
+
+    should_match = [
+        "claude-opus-4-7",
+        "claude-sonnet-4-7",
+        "claude-haiku-4-7",
+        "claude-opus-4-7-20260418",
+        "claude-sonnet-4-7.1",
+    ]
+    should_not_match = [
+        "claude-opus-4-6",
+        "claude-sonnet-4-6",
+        "claude-haiku-4-5",
+        "claude-opus-4-71",
+        "claude-opus-5",
+        "claude-3-opus",
+        "gpt-4o",
+    ]
+    for mid in should_match:
+        assert RX.match(mid), f"{mid!r} should match 4.7 sampling-removed regex"
+    for mid in should_not_match:
+        assert not RX.match(mid), f"{mid!r} should NOT match 4.7 regex"