Perplexity Sonar API and Appsmith AI Plugin Set for Shutdown by End of September

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Perplexity is retiring its Sonar API tiers on September 27, 2026, replacing them with the Agent API, which uses a different endpoint, request structure, and a mixed billing model combining token costs with per-tool-invocation fees. Appsmith is shutting down its managed AI plugin on September 30, 2026, having already blocked creation of new AI datasources since version 2.3. Developers using either service have days to assess exposure, as both deprecations were announced with limited visibility in official changelogs and migration guides. The Perplexity migration is not a simple model-string swap — response parsing, source citations, and cost-alert configurations all require review. For Appsmith, the recommended path is to switch to bring-your-own-key integrations with OpenAI, Anthropic, or Google AI before managed credentials are revoked.

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