Maintenance: Deprecate or remove outdated Gemini models based on 2026-01-29 API status

[WH-2099]

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1. Is this request related to a challenge you're experiencing? Tell me about your story.

Google Gemini API changelog

1. Models to be removed immediately (Shut down)

The following models have been officially shut down or deprecated and should be removed from the repository immediately:

LLM Models (models/llm/):

• 1.0 Series: gemini-pro, gemini-pro-vision
• 1.5 Series: gemini-1.5-pro, gemini-1.5-flash, gemini-1.5-flash-001
• 2.x Preview/Experimental:
  • gemini-2.5-pro-exp-03-25, gemini-2.5-pro-preview-03-25, gemini-2.5-pro-preview-05-06, gemini-2.5-pro-preview-06-05
  • gemini-2.5-flash-preview-04-17, gemini-2.5-flash-preview-05-20, gemini-2.5-flash-lite-preview-06-17
  • gemini-2.0-flash-exp, gemini-2.0-pro-exp, gemini-2.0-pro-exp-02-05
  • gemini-2.0-flash-lite-preview, gemini-2.0-flash-lite-preview-02-05
  • gemini-2.0-flash-thinking-exp-1219, gemini-2.0-flash-thinking-exp-01-21
  • gemini-2.0-flash-preview-image-generation
• Experimental Tags: gemini-exp-1114, gemini-exp-1121, gemini-exp-1206, and other older experimental YAMLs.

Text Embedding Models (models/text_embedding/):

• embedding-001 (Shut down Oct 2025)
• text-embedding-004 (Shut down Jan 14, 2026)

2. Models approaching deprecation (Within 1 month)

Note: No specific YAML files were found for these in the current local path, but they are scheduled for shutdown on Feb 17, 2026:

• gemini-2.5-flash-preview-09-25
• imagen-4.0-generate-preview-06-06

3. Upcoming Deprecations (For awareness, do not remove yet)

The following models are scheduled for shutdown later in 2026:

• March 31, 2026: gemini-2.0-flash, gemini-2.0-flash-001, gemini-2.0-flash-lite.
• June 17, 2026: gemini-2.5-pro, gemini-2.5-flash.
• July - Oct 2026: gemini-2.5-flash-lite, gemini-2.5-flash-image, gemini-embedding-001.

2. Additional context or comments

No response

3. Can you help us with this feature?

• I am interested in contributing to this feature.