From 125be57347091c51e91ca9cd8c5577ef637d53de Mon Sep 17 00:00:00 2001 From: Ishaan Jaffer Date: Wed, 21 Jan 2026 19:39:52 -0800 Subject: [PATCH] fix: transform_anthropic_messages_request for vertex anthropic --- .../anthropic/experimental_pass_through/transformation.py | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/litellm/llms/vertex_ai/vertex_ai_partner_models/anthropic/experimental_pass_through/transformation.py b/litellm/llms/vertex_ai/vertex_ai_partner_models/anthropic/experimental_pass_through/transformation.py index 0bedef3276b..fc75376c0cb 100644 --- a/litellm/llms/vertex_ai/vertex_ai_partner_models/anthropic/experimental_pass_through/transformation.py +++ b/litellm/llms/vertex_ai/vertex_ai_partner_models/anthropic/experimental_pass_through/transformation.py @@ -117,4 +117,9 @@ class VertexAIPartnerModelsAnthropicMessagesConfig(AnthropicMessagesConfig, Vert anthropic_messages_request.pop( "model", None ) # do not pass model in request body to vertex ai + + anthropic_messages_request.pop( + "output_format", None + ) # do not pass output_format in request body to vertex ai - vertex ai does not support output_format as yet + return anthropic_messages_request