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Tests for Gemini 2.5 models

  • Gemini 2.5 Pro is now GA
  • Gemini 2.5 Flash is now GA
  • Gemini 2.5 Flash Lite is in preview

Fix:

  • Gemini 2.5 Flash Lite for Vertex is only available in the "global" region. Changed default region for it.

Notes:

  • Gemini 2.5 Pro cannot have reasoning turned off
  • Gemini 2.5 Flash Lite defaults to reasoning off, but can be turned on
  • There is a discrepancy between the AI Studio and Vertex AI reporting for output tokens. AI Studio does not report the modality of output tokens, while Vertex AI does. Issue opened with Google.

Otherwise - integration tests performed as expected.

@dosubot dosubot bot added the size:M This PR changes 30-99 lines, ignoring generated files. label Jun 17, 2025
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@hntrl hntrl merged commit 599144a into langchain-ai:main Jun 17, 2025
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