Thinking

Thinking models are trained to generate the "thinking process" the model goes through as part of its response. As a result, thinking models are capable of stronger reasoning capabilities in its responses than equivalent base models.

Use thinking

Gemini 2.5 Pro Experimental models are available as an experimental model in Vertex AI. To use the latest Gemini 2.5 Pro Experimental model, select the gemini-2.5-pro-exp-03-25 model in the Model drop-down menu.

Gen AI SDK for Python

Install

pip install --upgrade google-genai
 To learn more, see the SDK reference documentation.

Set environment variables to use the Gen AI SDK with Vertex AI: 

# Replace the `GOOGLE_CLOUD_PROJECT` and `GOOGLE_CLOUD_LOCATION` values
# with appropriate values for your project.
export GOOGLE_CLOUD_PROJECT=GOOGLE_CLOUD_PROJECT
export GOOGLE_CLOUD_LOCATION=us-central1
export GOOGLE_GENAI_USE_VERTEXAI=True
 

from google import genai

client = genai.Client()
response = client.models.generate_content(
    model="gemini-2.5-pro-exp-03-25",
    contents="solve x^2 + 4x + 4 = 0",
)
print(response.text)
# Example Response:
#     Okay, let's solve the quadratic equation x² + 4x + 4 = 0.
#
#     There are a few ways to solve this:
#
#     **Method 1: Factoring**
#
#     1.  **Look for two numbers** that multiply to the constant term (4) and add up to the coefficient of the x term (4).
#         *   The numbers are 2 and 2 (since 2 * 2 = 4 and 2 + 2 = 4).
#     2.  **Factor the quadratic** using these numbers:
#         (x + 2)(x + 2) = 0
#         This can also be written as:
#         (x + 2)² = 0
#     3.  **Set the factor equal to zero** and solve for x:
#         x + 2 = 0
#         x = -2
#
#     This type of solution, where the factor is repeated, is called a repeated root or a root with multiplicity 2.
#
#     **Method 2: Using the Quadratic Formula**
#
#     The quadratic formula solves for x in any equation of the form ax² + bx + c = 0:
#     x = [-b ± √(b² - 4ac)] / 2a
#
#     1.  **Identify a, b, and c** in the equation x² + 4x + 4 = 0:
#         *   a = 1
#         *   b = 4
#         *   c = 4
#     2.  **Substitute these values into the formula:**
#         x = [-4 ± √(4² - 4 * 1 * 4)] / (2 * 1)
#     3.  **Simplify:**
#         x = [-4 ± √(16 - 16)] / 2
#         x = [-4 ± √0] / 2
#         x = [-4 ± 0] / 2
#     4.  **Calculate the result:**
#         x = -4 / 2
#         x = -2
#
#     Both methods give the same solution.
#
#     **Answer:**
#     The solution to the equation x² + 4x + 4 = 0 is **x = -2**.

Limitations

Gemini 2.5 Pro Experimental is an experimental model and has the following limitations:

  • 1M token input limit
  • Text, image, audio, and video input
  • 64k token output limit
  • Text only output

What's next?

Try Gemini 2.5 Pro Experimental for yourself with our Colab notebook, or open the Vertex AI console and try prompting the model for yourself.