fix(vertex_ai): add includeThoughts=True for Gemini 3 reasoning_effort #16838
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Gemini 3 models require 'includeThoughts: True' in the thinkingConfig to return the actual thought text. Previously, using reasoning_effort set the 'thinkingLevel' but missed the boolean flag, resulting in empty reasoning_content. This fix: 1. Updates `_map_reasoning_effort_to_thinking_level` to include `includeThoughts: True` for low/medium/high. 2. Adds unit tests to verify the config mapping.
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ishaan-jaff
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Nov 22, 2025
#16838) Gemini 3 models require 'includeThoughts: True' in the thinkingConfig to return the actual thought text. Previously, using reasoning_effort set the 'thinkingLevel' but missed the boolean flag, resulting in empty reasoning_content. This fix: 1. Updates `_map_reasoning_effort_to_thinking_level` to include `includeThoughts: True` for low/medium/high. 2. Adds unit tests to verify the config mapping.
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Gemini 3 models require 'includeThoughts: True' in the thinkingConfig to return the actual thought text. Previously, using reasoning_effort set the 'thinkingLevel' but missed the boolean flag, resulting in empty reasoning_content.
Title
Add includeThoughts=True for Gemini 3 reasoning_effort
Relevant issues
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 hard requirement - see detailsmake test-unitType
🐛 Bug Fix
Changes
Fix:
Updated
_map_reasoning_effort_to_thinking_levelinvertex_httpx.pyto return:includeThoughts: Truewhen effort is low/medium/high/minimal.includeThoughts: Falsewhen effort is disable/none.Testing:
Added a unit test
test_reasoning_effort_maps_to_thinking_level_gemini_3to verify that the config dictionary correctly includes theincludeThoughtsboolean for Gemini 3 models.