vercel/ai · error · UnsupportedFunctionalityError

Anthropic Message Batches do not support speed (request "${r

Error message

Anthropic Message Batches do not support speed (request "${requestId}").

What it means

Error "Anthropic Message Batches do not support speed (request "${requestId}")." thrown in vercel/ai.

Source

Thrown at packages/anthropic/src/anthropic-messages-batch.ts:456

      throw new InvalidArgumentError({
        argument: 'requests',
        message: `Anthropic batch request IDs must be unique; duplicate ID "${request.id}".`,
      });
    }

    ids.add(request.id);
  }
}

function validateAnthropicBatchBody({
  body,
  requestId,
}: {
  body: Record<string, unknown>;
  requestId: string;
}) {
  if (body.speed != null) {
    throw new UnsupportedFunctionalityError({
      functionality: 'providerOptions.anthropic.speed',
      message:
        `Anthropic Message Batches do not support speed ` +
        `(request "${requestId}").`,
    });
  }

  if (
    Array.isArray(body.fallbacks) &&
    body.fallbacks.some(
      fallback =>
        fallback != null &&
        typeof fallback === 'object' &&
        'speed' in fallback &&
        fallback.speed != null,
    )
  ) {
    throw new UnsupportedFunctionalityError({

View on GitHub (pinned to 69428b1f8b)

When it happens

Trigger: Thrown at packages/anthropic/src/anthropic-messages-batch.ts:456 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/15fb03773d215b5c. Report an issue: GitHub.