diff --git a/autogpt_platform/backend/backend/copilot/prompting.py b/autogpt_platform/backend/backend/copilot/prompting.py
index b0ec560730..21cae58192 100644
--- a/autogpt_platform/backend/backend/copilot/prompting.py
+++ b/autogpt_platform/backend/backend/copilot/prompting.py
@@ -436,25 +436,11 @@ def get_baseline_web_search_supplement() -> str:
     * SendWebRequest (fetch an arbitrary URL) —
       ``SEND_WEB_REQUEST_BLOCK_ID``.
 
-    The Perplexity model list is pulled from ``PerplexityModel`` at
-    render time — if a sonar SKU is added / dropped upstream the
-    supplement follows automatically and the registry test catches
-    block-ID drift.
-
     The supplement is static — no per-user / per-session content — so it
     stays on the cacheable prefix.  Append to the baseline system prompt
     only; SDK callers would just confuse their native ``WebSearch`` with
     a competing block recipe.
     """
-    from backend.blocks.perplexity import PerplexityModel  # noqa: PLC0415
-
-    default_model = PerplexityModel.SONAR.value
-    # Enumerate in declaration order so the default sonar SKU stays
-    # first.  ``.value`` gives the provider-prefixed form Kimi must pass
-    # verbatim (``perplexity/sonar``, not bare ``sonar``) — the block's
-    # input validator coerces unknown values back to SONAR, so the
-    # previous prompt silently degraded every call.
-    model_lines = "\n".join(f"  - ``{m.value}``" for m in PerplexityModel)
     return f"""
 
 ## Web Search & URL Fetch (fast mode)
@@ -464,13 +450,10 @@ copilot blocks via ``run_block`` when you need live web content.
 
 ### Web search with citations — Perplexity
 - Block ID: ``{PERPLEXITY_BLOCK_ID}``
-- Input: ``{{"prompt": "<query>", "model": "{default_model}"}}``.
-- ``model`` MUST be one of the provider-prefixed values below (pass the
-  full string verbatim — unknown values silently fall back to
-  ``{default_model}``):
-{model_lines}
-- Default to ``{default_model}`` unless the user asks for deeper
-  research, in which case pass ``perplexity/sonar-deep-research``.
+- Input: ``{{"prompt": "<query>", "model": "sonar"}}``
+  (``model`` defaults to ``sonar``; other options: ``sonar-pro``,
+  ``sonar-reasoning``, ``sonar-reasoning-pro``, ``sonar-deep-research``
+  — use ``sonar`` unless the user asks for deeper research.)
 - Output: ``response`` (string), ``annotations`` (list of URL citations).
 - Requires Perplexity credentials connected to the user's account.  If
   the block errors with a missing-credentials message, call
diff --git a/autogpt_platform/backend/backend/copilot/prompting_test.py b/autogpt_platform/backend/backend/copilot/prompting_test.py
index c8be038012..837044772d 100644
--- a/autogpt_platform/backend/backend/copilot/prompting_test.py
+++ b/autogpt_platform/backend/backend/copilot/prompting_test.py
@@ -87,44 +87,9 @@ class TestBaselineWebSearchSupplement:
         assert '"prompt"' in text
         # SendWebRequest required input.
         assert '"url"' in text
-
-    def test_supplement_uses_perplexitymodel_enum_values_verbatim(self):
-        """Regression: the earlier supplement invented bare sonar IDs
-        (``"sonar"``, ``"sonar-reasoning"``, ``"sonar-reasoning-pro"``)
-        that don't match ``PerplexityModel`` values — every call logged
-        an ``Invalid PerplexityModel`` warning and silently fell back to
-        plain ``sonar``.  The supplement must now list exactly the enum
-        values, in full provider-prefixed form, and the default must
-        equal ``PerplexityModel.SONAR.value``."""
-        from backend.blocks.perplexity import PerplexityModel
-
-        text = prompting.get_baseline_web_search_supplement()
-        # Every enum value surfaces verbatim.
-        for model in PerplexityModel:
-            assert (
-                model.value in text
-            ), f"Supplement missing {model.value!r} (known PerplexityModel value)"
-        # The default example carries the provider prefix so Kimi can
-        # pass it through without the fallback warning firing.
-        assert f'"model": "{PerplexityModel.SONAR.value}"' in text
-
-    def test_supplement_does_not_mention_invented_sonar_variants(self):
-        """Regression: these bare strings were listed as valid Perplexity
-        models before the enum-driven rewrite — none match a real
-        ``PerplexityModel`` value, so the block silently fell back to
-        ``SONAR`` on every call.  Guard against the next reader
-        accidentally reintroducing them."""
-        text = prompting.get_baseline_web_search_supplement()
-        # ``sonar-reasoning`` / ``sonar-reasoning-pro`` are not enum
-        # members today — if upstream adds them, re-enable this check
-        # alongside an ``assert PerplexityModel.SONAR_REASONING ...``.
-        assert "sonar-reasoning" not in text
-        # Bare ``"sonar"`` without the ``perplexity/`` prefix is rejected
-        # by the block's model validator; the enum-driven supplement
-        # should emit only the provider-prefixed form.  Check the
-        # quote-wrapped bare form to avoid matching ``perplexity/sonar``.
-        assert '"sonar"' not in text
-        assert '"sonar-pro"' not in text
+        # Default Perplexity model is named explicitly so Kimi doesn't
+        # guess (``sonar-xl`` etc. 404 on the Perplexity API).
+        assert '"sonar"' in text
 
     def test_supplement_flags_credentials_dependency(self):
         text = prompting.get_baseline_web_search_supplement()