sampleImageSize 2K on model imagen-4.0-ultra-generate-001 doesn't seem to work

[ringodotnl]

Environment details

• "typescript": "~5.8.3",
• WSL
• Package version: "@google/genai": "^1.16.0"

Steps to reproduce

  const apiConfig = {
    model: "imagen-4.0-ultra-generate-001",
    prompt: enhancedPrompt,
    config: {
      numberOfImages: numberOfImages,
      aspectRatio: aspectRatio,
      sampleImageSize: sampleImageSize,
    },
  };

const response = await this.genAI.models.generateImages(apiConfig);

All config params are working expect sampleImageSize, when settings it on 2K it still used the 1K default.

Any ideas?

Cheers.

[ringodotnl]

Did look at the sources and it seems like you need to use imageSize instead (documentation did say sampleImageSize).

[shmishra99]

Hi @ringodotnl ,

Thanks for bringing this to our attention. You're right, the correct parameter for generating a 2K resolution image is imageSize, not sampleImageSize, as stated in our documentation. While naming conventions can vary across different SDKs, I'll check with the team to see if we can update the documentation and standardize the parameter to imageSize, since it's supported by most SDKs.