[Improvement]: Mark Gemini 2.5 pro as Preview in Docs (#55639)

Author: sophietheking

content/copilot/using-github-copilot/ai-models/changing-the-ai-model-for-copilot-chat.md

@@ -31,12 +31,12 @@ The following models are currently available in the immersive mode of {% data va
 
 * {% data variables.copilot.copilot_gpt_4o %}
 * {% data variables.copilot.copilot_gpt_41 %}
-* {% data variables.copilot.copilot_gpt_45 %}
+* {% data variables.copilot.copilot_gpt_45 %} (preview)
 * {% data variables.copilot.copilot_claude_sonnet_35 %}
 * {% data variables.copilot.copilot_claude_sonnet_37 %}
 * {% data variables.copilot.copilot_claude_sonnet_37 %} Thinking
 * {% data variables.copilot.copilot_gemini_flash %}
-* {% data variables.copilot.copilot_gemini_25_pro %}
+* {% data variables.copilot.copilot_gemini_25_pro %} (preview)
 * {% data variables.copilot.copilot_o1 %}
 * {% data variables.copilot.copilot_o3 %}
 * {% data variables.copilot.copilot_o3_mini %}
@@ -80,7 +80,7 @@ The following models are currently available through multi-model {% data variabl
 
 * {% data variables.copilot.copilot_gpt_4o %}
 * {% data variables.copilot.copilot_gpt_41 %}
-* {% data variables.copilot.copilot_gpt_45 %}
+* {% data variables.copilot.copilot_gpt_45 %} (preview)
 * {% data variables.copilot.copilot_claude_sonnet_35 %}
 * {% data variables.copilot.copilot_claude_sonnet_37 %}
 * {% data variables.copilot.copilot_claude_sonnet_37 %} Thinking

content/copilot/using-github-copilot/ai-models/choosing-the-right-ai-model-for-your-task.md

@@ -114,6 +114,9 @@ The following table summarizes when an alternative model may be a better choice:
 
 ## GPT-4.5
 
+> [!NOTE]
+> GPT-4.5 in {% data variables.product.prodname_copilot_chat_short %} is currently in {% data variables.release-phases.public_preview %} and subject to change.
+
 OpenAI GPT-4.5 improves reasoning, reliability, and contextual understanding. It works well for development tasks that involve complex logic, high-quality code generation, or interpreting nuanced intent.
 
 Compared to {% data variables.copilot.copilot_gpt_41 %}, GPT-4.5 produces more consistent results for multi-step reasoning, long-form content, and complex problem-solving. It may have slightly higher latency and costs than {% data variables.copilot.copilot_gpt_41 %} and other smaller models.
@@ -434,6 +437,8 @@ The following table summarizes when an alternative model may be a better choice:
 
 ## {% data variables.copilot.copilot_gemini_25_pro %}
 
+{% data reusables.copilot.gemini-25-pro-public-preview-note %}
+
 {% data variables.copilot.copilot_gemini_25_pro %} is Google's latest AI model, designed to handle complex tasks with advanced reasoning and coding capabilities. It also works well for heavy research workflows that require long-context understanding and analysis.
 
 For more information about {% data variables.copilot.copilot_gemini_25_pro %}, see [Google's documentation](https://cloud.google.com/vertex-ai/generative-ai/docs/models/gemini/2-5-pro).

data/reusables/copilot/gemini-25-pro-public-preview-note.md

@@ -0,0 +1,2 @@
+> [!NOTE]
+> {% data variables.copilot.copilot_gemini_25_pro %} in {% data variables.product.prodname_copilot_chat_short %} is currently in {% data variables.release-phases.public_preview %} and subject to change.