Gemini 3.1 Flash Image (Nano Banana 2)

Gemini 3.1 Flash Image (Nano Banana 2) is optimized for image understanding and generation and offers a balance of price and performance.

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Model ID gemini-3.1-flash-image
Modalities
Text Input and output
Image Input and output
Audio Not supported
Video Input only
Token limits Context window 131,072
Maximum output tokens 32,768
Capabilities
Tools
Consumption options
Input size limit 500 MB
Technical specifications Image
  • Maximum images per prompt: 14
  • Maximum file size per file for inline data or direct uploads through the console: 7 MB
  • Maximum file size per file from Google Cloud Storage: 30 MB
  • Maximum number of output images per prompt: Limited to 32,768 output tokens
  • Supported aspect ratios: 1:1, 3:2, 2:3, 3:4, 1:4, 4:1, 4:3, 4:5, 5:4, 1:8, 8:1, 9:16, 16:9, 21:9, 9:21
  • Supported resolutions: 512, 1K, 2K, 4K
  • Supported MIME types:
    image/png, image/jpeg, image/webp, image/heic, image/heif
Text
  • Maximum number of files per prompt: As supported by the 128k token context window
  • Maximum number of pages per file: As supported by the 128k token context window
  • Maximum file size per file: 50 MB (API and Cloud Storage imports) or 7 MB (direct upload through Google Cloud console)
  • Supported MIME types:
    application/pdf, text/plain
Video
  • Maximum number of input video files per prompt: 10
  • Maximum YouTube URLs per prompt: 1
  • Maximum video length (without audio): As supported by the 128k token context window (approximately 25 minutes).
  • Supported MIME types:
    video/x-flv, video/quicktime, video/mpeg, video/mpegs, video/mpg, video/mp4, video/webm, video/wmv, video/3gpp
Parameter defaults
  • Temperature: 0.0-2.0 (default 1.0)
  • topP: 0.0-1.0 (default 0.95)
  • candidateCount: 1
Supported regions

Model availability

  • Global: global
  • Multi-region: us, eu

ML processing

  • Multi-region: us, eu

Provisioned Throughput

  • Global: global
  • Multi-region: us, eu

Standard PayGo

  • Global: global
  • Multi-region: us, eu
Versions
  • gemini-3.1-flash-image
    • Launch stage: GA
    • Release date: May 28, 2026
    • Retirement date†: May 28, 2027 or later
Security controls Online prediction
  • Data residency
  • CMEK
  • VPC-SC
  • AXT
Batch inference
  • Data residency
  • CMEK
  • VPC-SC
  • AXT
Context caching
  • Data residency
  • CMEK
  • VPC-SC
  • AXT
See Security controls for more information.

† Listed retirement dates refer to retirement of support in Gemini Enterprise Agent Platform. Models may remain accessible through the Gemini API after these dates have passed. The Gemini API is not a Google Cloud offering and is subject to its own terms of service. For details, see the Gemini API documentation.

Image generation specifications

Gemini 3.1 Flash Image consumes 1,120 tokens per input image.

Output image token consumption varies based on the generated image resolution:

Output resolution Approximate megapixels Output image tokens
512 0.25 747
1K 1 1,120
2K 4 1,680
4K 16 2,520

For more information about image generation using Gemini 3.1 Flash Image, see Generate and edit images with Gemini.