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fix: set supports_reasoning=false for Vertex AI Gemini image models #31907

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fix: set supports_reasoning=false for Vertex AI Gemini image models #31907

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77fb31c
fix: set supports_reasoning=false for Vertex AI/Gemini image models a…
bennedictbett Jul 3, 2026
b934ba3
chore: trigger CI re-run
bennedictbett Aug 21, 2026
691bf5e
chore: retrigger CI
bennedictbett Aug 21, 2026
5776980
iMerge upstream/litellm_internal_stagingitellm_internal_staging' into…
bennedictbett Aug 21, 2026
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10 changes: 10 additions & 0 deletions litellm/model_prices_and_context_window_backup.json
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -21276,6 +21276,7 @@
"supports_image_size": false
},
"gemini/gemini-2.5-flash-image": {
"supports_reasoning": false,
"cache_read_input_token_cost": 3e-08,
"deprecation_date": "2026-10-02",
"input_cost_per_audio_token": 1e-06,
Expand Down Expand Up @@ -21327,6 +21328,7 @@
"supports_image_size": false
},
"gemini/gemini-3-pro-image": {
"supports_reasoning": false,
"input_cost_per_image": 0.0011,
"input_cost_per_token": 2e-06,
"input_cost_per_token_batches": 1e-06,
Expand Down Expand Up @@ -21370,6 +21372,7 @@
"supports_reasoning": false
},
"gemini/gemini-3-pro-image-preview": {
"supports_reasoning": false,
"deprecation_date": "2026-06-25",
"input_cost_per_image": 0.0011,
"input_cost_per_token": 2e-06,
Expand Down Expand Up @@ -21414,6 +21417,7 @@
"web_search_billing_unit": "per_query"
},
"gemini/gemini-3.1-flash-image": {
"supports_reasoning": false,
"input_cost_per_token": 5e-07,
"input_cost_per_token_batches": 2.5e-07,
"litellm_provider": "gemini",
Expand Down Expand Up @@ -21456,6 +21460,7 @@
"web_search_billing_unit": "per_query"
},
"gemini/gemini-3.1-flash-image-preview": {
"supports_reasoning": false,
"deprecation_date": "2026-06-25",
"input_cost_per_token": 5e-07,
"input_cost_per_token_batches": 2.5e-07,
Expand Down Expand Up @@ -40899,6 +40904,7 @@
"supports_tool_choice": true
},
"vertex_ai/gemini-2.5-flash-image": {
"supports_reasoning": false,
"deprecation_date": "2026-10-02",
"cache_read_input_token_cost": 3e-08,
"input_cost_per_audio_token": 1e-06,
Expand Down Expand Up @@ -40945,6 +40951,7 @@
"supports_image_size": false
},
"vertex_ai/gemini-3-pro-image": {
"supports_reasoning": false,
"deprecation_date": "2027-05-28",
"input_cost_per_image": 0.0011,
"input_cost_per_token": 2e-06,
Expand All @@ -40962,6 +40969,7 @@
"source": "https://docs.cloud.google.com/vertex-ai/generative-ai/docs/models/gemini/3-pro-image"
},
"vertex_ai/gemini-3-pro-image-preview": {
"supports_reasoning": false,
"input_cost_per_image": 0.0011,
"input_cost_per_token": 2e-06,
"input_cost_per_token_batches": 1e-06,
Expand All @@ -40978,6 +40986,7 @@
"source": "https://docs.cloud.google.com/vertex-ai/generative-ai/docs/models/gemini/3-pro-image"
},
"vertex_ai/gemini-3.1-flash-image": {
"supports_reasoning": false,
"deprecation_date": "2027-05-28",
"input_cost_per_image": 0.00056,
"input_cost_per_token": 5e-07,
Expand All @@ -40993,6 +41002,7 @@
"source": "https://cloud.google.com/vertex-ai/generative-ai/pricing#gemini-models"
},
"vertex_ai/gemini-3.1-flash-image-preview": {
"supports_reasoning": false,
"input_cost_per_image": 0.00056,
"input_cost_per_token": 5e-07,
"litellm_provider": "vertex_ai-language-models",
Expand Down
10 changes: 10 additions & 0 deletions model_prices_and_context_window.json
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -21276,6 +21276,7 @@
"supports_image_size": false
},
"gemini/gemini-2.5-flash-image": {
"supports_reasoning": false,
"cache_read_input_token_cost": 3e-08,
"deprecation_date": "2026-10-02",
"input_cost_per_audio_token": 1e-06,
Expand Down Expand Up @@ -21327,6 +21328,7 @@
"supports_image_size": false
},
"gemini/gemini-3-pro-image": {
"supports_reasoning": false,
"input_cost_per_image": 0.0011,
"input_cost_per_token": 2e-06,
"input_cost_per_token_batches": 1e-06,
Expand Down Expand Up @@ -21370,6 +21372,7 @@
"supports_reasoning": false
},
"gemini/gemini-3-pro-image-preview": {
"supports_reasoning": false,
"deprecation_date": "2026-06-25",
"input_cost_per_image": 0.0011,
"input_cost_per_token": 2e-06,
Expand Down Expand Up @@ -21414,6 +21417,7 @@
"web_search_billing_unit": "per_query"
},
"gemini/gemini-3.1-flash-image": {
"supports_reasoning": false,
"input_cost_per_token": 5e-07,
"input_cost_per_token_batches": 2.5e-07,
"litellm_provider": "gemini",
Expand Down Expand Up @@ -21456,6 +21460,7 @@
"web_search_billing_unit": "per_query"
},
"gemini/gemini-3.1-flash-image-preview": {
"supports_reasoning": false,
"deprecation_date": "2026-06-25",
"input_cost_per_token": 5e-07,
"input_cost_per_token_batches": 2.5e-07,
Expand Down Expand Up @@ -40899,6 +40904,7 @@
"supports_tool_choice": true
},
"vertex_ai/gemini-2.5-flash-image": {
"supports_reasoning": false,
"deprecation_date": "2026-10-02",
"cache_read_input_token_cost": 3e-08,
"input_cost_per_audio_token": 1e-06,
Expand Down Expand Up @@ -40945,6 +40951,7 @@
"supports_image_size": false
},
"vertex_ai/gemini-3-pro-image": {
"supports_reasoning": false,
"deprecation_date": "2027-05-28",
"input_cost_per_image": 0.0011,
"input_cost_per_token": 2e-06,
Expand All @@ -40962,6 +40969,7 @@
"source": "https://docs.cloud.google.com/vertex-ai/generative-ai/docs/models/gemini/3-pro-image"
},
"vertex_ai/gemini-3-pro-image-preview": {
"supports_reasoning": false,
"input_cost_per_image": 0.0011,
"input_cost_per_token": 2e-06,
"input_cost_per_token_batches": 1e-06,
Expand All @@ -40978,6 +40986,7 @@
"source": "https://docs.cloud.google.com/vertex-ai/generative-ai/docs/models/gemini/3-pro-image"
},
"vertex_ai/gemini-3.1-flash-image": {
"supports_reasoning": false,
"deprecation_date": "2027-05-28",
"input_cost_per_image": 0.00056,
"input_cost_per_token": 5e-07,
Expand All @@ -40993,6 +41002,7 @@
"source": "https://cloud.google.com/vertex-ai/generative-ai/pricing#gemini-models"
},
"vertex_ai/gemini-3.1-flash-image-preview": {
"supports_reasoning": false,
"input_cost_per_image": 0.00056,
"input_cost_per_token": 5e-07,
"litellm_provider": "vertex_ai-language-models",
Expand Down
42 changes: 42 additions & 0 deletions ...litellm/llms/vertex_ai/image_generation/test_vertex_ai_image_generation_transformation.py
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -680,3 +680,45 @@ def test_imagen_get_complete_url(self):
assert "us-central1" in url
assert "imagegeneration@006" in url
assert "predict" in url

class TestVertexAIImageModelsSupportsReasoning:
"""Vertex AI Gemini image models must not inherit reasoning support.

Image generation endpoints reject reasoning_effort with a 400. The
vertex_ai/ entries were missing an explicit supports_reasoning: false,
causing them to silently inherit True from the provider-level fallback.
"""

MODELS = [
"vertex_ai/gemini-2.5-flash-image",
"vertex_ai/gemini-3-pro-image-preview",
"vertex_ai/gemini-3-pro-image",
"vertex_ai/gemini-3.1-flash-image-preview",
"vertex_ai/gemini-3.1-flash-image",
"gemini/gemini-3-pro-image-preview",
"gemini/gemini-3-pro-image",
"gemini/gemini-3.1-flash-image-preview",
"gemini/gemini-3.1-flash-image",
]

def test_supports_reasoning_is_false_in_cost_map(self):
"""supports_reasoning must be explicitly False in the cost map for all image models."""
from litellm.litellm_core_utils.get_model_cost_map import GetModelCostMap

cost_map = GetModelCostMap.load_local_model_cost_map()
for model in self.MODELS:
assert model in cost_map, f"{model} not found in cost map"
assert cost_map[model].get("supports_reasoning") is False, (
f"{model}: expected supports_reasoning=False, "
f"got {cost_map[model].get('supports_reasoning')!r}"
)

def test_supports_reasoning_returns_false(self):
"""litellm.supports_reasoning() must return False for all affected image models."""
import litellm

for model in self.MODELS:
result = litellm.supports_reasoning(model=model)
assert result is False, (
f"{model}: litellm.supports_reasoning() returned {result!r}, expected False"
)
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