vercel/ai · error · InvalidArgumentError

Cartesia Ink 2 currently supports English only.

Error message

Cartesia Ink 2 currently supports English only.

What it means

Error "Cartesia Ink 2 currently supports English only." thrown in vercel/ai.

Source

Thrown at packages/cartesia/src/cartesia-transcription-model.ts:210

    if (!isStreamingTranscriptionModelId(this.modelId)) {
      throw new UnsupportedFunctionalityError({
        functionality: `streaming transcription with ${this.modelId}`,
      });
    }

    const currentDate = this.config._internal?.currentDate?.() ?? new Date();
    const warnings: SharedV4Warning[] = [];
    const cartesiaOptions = await parseProviderOptions({
      provider: 'cartesia',
      providerOptions: options.providerOptions,
      schema: cartesiaTranscriptionModelOptionsSchema,
    });

    if (
      cartesiaOptions?.language != null &&
      cartesiaOptions.language !== 'en'
    ) {
      throw new InvalidArgumentError({
        argument: 'providerOptions',
        message: 'Cartesia Ink 2 currently supports English only.',
      });
    }

    if (cartesiaOptions?.timestampGranularities != null) {
      warnings.push({
        type: 'unsupported',
        feature: 'providerOptions.cartesia.timestampGranularities',
        details:
          'Cartesia streaming transcription does not support timestamp granularities.',
      });
    }

    // Always validate the declared media type — an explicit
    // `streaming.encoding` override must not bypass the allowlist.
    const inferredEncoding = cartesiaEncodingFromInputAudioFormat(
      options.inputAudioFormat.type,

View on GitHub (pinned to 69428b1f8b)

When it happens

Trigger: Thrown at packages/cartesia/src/cartesia-transcription-model.ts:210 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of vercel/ai@69428b1f8b (2026-08-30). Data as JSON: /api/errors/92d0491dffa77f46. Report an issue: GitHub.