fix(gemini): skip thinking config for image models - #17027
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…eter (BerriAI#17013) - gemini-3-pro-image-preview does not support thinking_level parameter - Added check to skip adding thinkingConfig for models containing "image" - Fixes BadRequestError: "Thinking level is not supported for this model" - Only affects automatic default behavior, user can still pass reasoning_effort explicitly Fixes BerriAI#17013
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* fix(gemini): exclude image models from automatic thinking_level parameter (BerriAI#17013) - gemini-3-pro-image-preview does not support thinking_level parameter - Added check to skip adding thinkingConfig for models containing "image" - Fixes BadRequestError: "Thinking level is not supported for this model" - Only affects automatic default behavior, user can still pass reasoning_effort explicitly Fixes BerriAI#17013 * test: add tests for gemini-3 image models thinking_level exclusion * update docs
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Title
Fix: Exclude Gemini 3 image models from automatic thinking_level parameter
Relevant issues
Fixes #17013
Pre-Submission checklist
Please complete all items before asking a LiteLLM maintainer to review your PR
tests/litellm/directory, Adding at least 1 test is a hardrequirement - see details
make test-unitType
🐛 Bug Fix
Changes
Summary
LiteLLM automatically adds
thinkingConfig: {thinkingLevel: "low"}to ALL Gemini 3+ models by default. However, Gemini 3 image models (e.g.,gemini-3-pro-image-preview) do not support thethinking_levelparameter, causing API requests to fail with:BadRequestError: "Thinking level is not supported for this modelSolution
Added check to exclude models containing "image" from automatic
thinkingConfiginjection (line 911 invertex_and_google_ai_studio_gemini.py).Code Changes
litellm/llms/vertex_ai/gemini/vertex_and_google_ai_studio_gemini.pyif "image" not in model.lower()check before adding automatic thinking configtests/test_litellm/llms/vertex_ai/gemini/test_vertex_and_google_ai_studio_gemini.py- Added 3 unit tests (all passing ✅)docs/my-website/docs/providers/gemini.md- Added warning about image models not supporting thinking_levelDocs
According to https://docs.cloud.google.com/vertex-ai/generative-ai/docs/models/gemini/3-pro-image, gemini-3-pro-image-preview only supports: temperature, topP, topK, candidateCount - NOT thinking_level.