diff --git a/.speakeasy/in.openapi.yaml b/.speakeasy/in.openapi.yaml
index c8dcb85c..71d63ab5 100644
--- a/.speakeasy/in.openapi.yaml
+++ b/.speakeasy/in.openapi.yaml
@@ -46588,6 +46588,18 @@ paths:
               - 'design-arena-elo-high-to-low'
             example: 'newest'
             type: 'string'
+        - description: 'Filter models and presets by the named harness''s eligibility policy: tool calling is required, and when one of your guardrails sets `enforce_first_party_harness_models`, only the harness vendor''s own models remain (OpenAI for codex, Anthropic for claude_code and claude_desktop). This filter doesn''t apply the harness''s ranking, caps or Claude Desktop model ID aliases, so returned IDs stay routable. One of: claude_code, claude_desktop, codex. Omit it to get every model you can use.'
+          in: 'query'
+          name: 'client'
+          required: false
+          schema:
+            description: 'Filter models and presets by the named harness''s eligibility policy: tool calling is required, and when one of your guardrails sets `enforce_first_party_harness_models`, only the harness vendor''s own models remain (OpenAI for codex, Anthropic for claude_code and claude_desktop). This filter doesn''t apply the harness''s ranking, caps or Claude Desktop model ID aliases, so returned IDs stay routable. One of: claude_code, claude_desktop, codex. Omit it to get every model you can use.'
+            enum:
+              - 'claude_code'
+              - 'claude_desktop'
+              - 'codex'
+            example: 'codex'
+            type: 'string'
       responses:
         '200':
           content: