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docs: AssemblyAI Universal 3.5 Pro, multilingual, and keyterms updates - #1151

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assemblyai-provider-docs-update
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docs: AssemblyAI Universal 3.5 Pro, multilingual, and keyterms updates#1151
nick-vapi wants to merge 2 commits into
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assemblyai-provider-docs-update

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@nick-vapi nick-vapi commented Aug 17, 2026

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Context

Updates the AssemblyAI transcriber docs to reflect current platform support, including the newly released Universal 3.5 Pro model.

Changes

  • providers/transcriber/assembly-ai.mdx — adds Universal 3.5 Pro (speechModel: "universal-3-5-pro") with its configuration options (mode, prompt, agentContext, languageCodes, keytermsPrompt), adds it to the supported-languages table (18 languages with automatic language detection and code-switching, linking to AssemblyAI's language list), and corrects the keyterms note: keyterms prompting is supported on universal-streaming-english and universal-3-5-pro, but not on universal-streaming-multilingual.
  • customization/custom-keywords.mdx — retitled to be provider-neutral and adds an AssemblyAI keyterms prompting section (limits, model support, pricing, example) alongside the existing Deepgram content.
  • customization/multilingual.mdx — updates the AssemblyAI row in the speech-recognition table from "English only" to full auto-detection across 18 languages.
  • customization/voice-pipeline-configuration.mdx — removes outdated "(English only)" qualifiers on AssemblyAI's built-in end-of-turn detection.

Out of scope

The compliance table on the transcriber overview page is unchanged in this PR.

🤖 Generated with Claude Code

…ltilingual support

Addresses AssemblyAI team feedback on docs.vapi.ai:
- assembly-ai provider page: add Universal 3.5 Pro model (modes, prompt,
  agentContext, languageCodes, keyterms), correct the keyterms caveat
- custom-keywords: retitle provider-neutral, add AssemblyAI keyterms section
- multilingual table: AssemblyAI now full auto-detection, 18 languages
- voice-pipeline-configuration: drop stale English-only claims for Assembly

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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