deepseek-ai/deepseek-harness · error · LlmError

UNSUPPORTED_CONTENT

UNSUPPORTED_CONTENT

Error message

DeepSeek model "${options.model}" does not accept image input.

What it means

Error "DeepSeek model "${options.model}" does not accept image input." thrown in deepseek-ai/deepseek-harness.

Source

Thrown at packages/llm/llm-deepseek/src/adapter.ts:447

  stream(options: GenerateOptions): AsyncIterable<StreamChunk> {
    return this.streamWithConnection(options, this.config.options())
  }

  private async * streamWithConnection(
    options: GenerateOptions,
    connection: DeepSeekConnectionOptions,
  ): AsyncIterable<StreamChunk> {
    // One resolution per stream call: connection facts and the credential
    // freeze here and hold for this whole request, so an in-flight stream
    // never observes a configuration change and the next call re-resolves.
    // The key resolves *from this snapshot*, so an endpoint and the secret
    // sent to it can never come from different configuration generations.
    const hasImages = options.messages.some(message => contentHasImage(message.content))
    let attachments: AttachmentStore | undefined
    if (hasImages) {
      const model = connection.models.find(entry => entry.id === options.model)
      if (model?.inputModalities?.includes('image') !== true) {
        throw new LlmError(
          `DeepSeek model "${options.model}" does not accept image input.`,
          'UNSUPPORTED_CONTENT',
        )
      }
      attachments = this.config.resolveAttachments?.()
      if (attachments === undefined) {
        throw new LlmError(
          'DeepSeek image conversion requires the durable attachment service.',
          'UNSUPPORTED_CONTENT',
        )
      }
    }
    const apiKey = await this.config.resolveApiKey(connection)
    const userId = this.config.resolveUserId()
    const consumer = new AbortController()
    const upstream = options.signal === undefined
      ? consumer.signal
      : AbortSignal.any([options.signal, consumer.signal])

View on GitHub (pinned to b150a551b8)

Solutions

1. Remove image content from the request or switch to a DeepSeek model that accepts image input.

When it happens

Trigger: Thrown at packages/llm/llm-deepseek/src/adapter.ts:447 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of deepseek-ai/deepseek-harness@b150a551b8 (2026-08-24). Data as JSON: /api/errors/78f853c8583715ec. Report an issue: GitHub.