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Pydantic AI Docs — Models Overview

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2026-03-18

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2026-03-18 / SKILLSPydantic AI FallbackModel: Content-Based Semantic Fallback Across 25+ LLM Providers with Disabled SDK RetriesPydantic AI's FallbackModel chains multiple providers and triggers fallback on 429/5xx—but also supports content-based fallback where a semantically invalid response (successful HTTP, wrong output) triggers the next provider. Critical pattern: disable provider SDK retries (set max_retries=0) so the fallback fires immediately rather than waiting on exponential backoff. Validation errors are automatically passed back to the model as retry prompts.

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