From 894bec794efd5f6284cbe596adce946b08c6da8a Mon Sep 17 00:00:00 2001
From: Hangfei Lin <hangfei@google.com>
Date: Wed, 10 Sep 2025 15:22:13 -0700
Subject: [PATCH] chore: Update default and example Gemini models to new
 versions

Changes references from `gemini-1.5-flash` and `gemini-1.5-pro` to `gemini-2.5-flash` and `gemini-2.5-pro` in docstrings, default values, sample agents, and tests.

PiperOrigin-RevId: 805536434
---
 contributing/samples/bigtable/agent.py | 2 +-
 src/google/adk/models/base_llm.py      | 4 ++--
 src/google/adk/models/google_llm.py    | 2 +-
 src/google/adk/models/lite_llm.py      | 2 +-
 4 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/contributing/samples/bigtable/agent.py b/contributing/samples/bigtable/agent.py
index 25e90d8d..37cf8025 100644
--- a/contributing/samples/bigtable/agent.py
+++ b/contributing/samples/bigtable/agent.py
@@ -62,7 +62,7 @@ bigtable_toolset = BigtableToolset(
 # The variable name `root_agent` determines what your root agent is for the
 # debug CLI
 root_agent = LlmAgent(
-    model="gemini-1.5-flash",
+    model="gemini-2.5-flash",
     name="bigtable_agent",
     description=(
         "Agent to answer questions about Bigtable database tables and"
diff --git a/src/google/adk/models/base_llm.py b/src/google/adk/models/base_llm.py
index 159ae221..b2ae3c47 100644
--- a/src/google/adk/models/base_llm.py
+++ b/src/google/adk/models/base_llm.py
@@ -32,7 +32,7 @@ class BaseLlm(BaseModel):
   """The BaseLLM class.
 
   Attributes:
-    model: The name of the LLM, e.g. gemini-1.5-flash or gemini-1.5-flash-001.
+    model: The name of the LLM, e.g. gemini-2.5-flash or gemini-2.5-pro.
   """
 
   model_config = ConfigDict(
@@ -42,7 +42,7 @@ class BaseLlm(BaseModel):
   """The pydantic model config."""
 
   model: str
-  """The name of the LLM, e.g. gemini-1.5-flash or gemini-1.5-flash-001."""
+  """The name of the LLM, e.g. gemini-2.5-flash or gemini-2.5-pro."""
 
   @classmethod
   def supported_models(cls) -> list[str]:
diff --git a/src/google/adk/models/google_llm.py b/src/google/adk/models/google_llm.py
index d6346deb..1bcd66dd 100644
--- a/src/google/adk/models/google_llm.py
+++ b/src/google/adk/models/google_llm.py
@@ -58,7 +58,7 @@ class Gemini(BaseLlm):
     model: The name of the Gemini model.
   """
 
-  model: str = 'gemini-1.5-flash'
+  model: str = 'gemini-2.5-flash'
 
   retry_options: Optional[types.HttpRetryOptions] = None
   """Allow Gemini to retry failed responses.
diff --git a/src/google/adk/models/lite_llm.py b/src/google/adk/models/lite_llm.py
index f25f0cdb..4c6be95d 100644
--- a/src/google/adk/models/lite_llm.py
+++ b/src/google/adk/models/lite_llm.py
@@ -683,7 +683,7 @@ def _is_litellm_gemini_model(model_string: str) -> bool:
 
   Args:
     model_string: A LiteLLM model string (e.g., "gemini/gemini-2.5-pro" or
-      "vertex_ai/gemini-1.5-flash")
+      "vertex_ai/gemini-2.5-flash")
 
   Returns:
     True if it's a Gemini model accessed via LiteLLM, False otherwise