Day 0 Support: Nano Banana 2.1

LiteLLM supports gemini-nano-banana-2.1 on day 0 on Google AI Studio (gemini/) and Gemini Enterprise Agent Platform, formerly Vertex AI (vertex_ai/), through /v1/images/generations, /v1/images/edits and /chat/completions. It replaces Nano Banana 2 (gemini-3.1-flash-image), which the Gemini API shuts down on October 29, 2026.

Per Google, Nano Banana 2.1 improves visual quality and text rendering at 1K, 2K and 4K, fixes tiling on wide aspect ratios, takes up to 14 reference images, and supports Search grounding and configurable thinking levels.

Pricing​

• Image output: $30 / MTok ($0.0336 per 1K image)
• Text input: $1.50 / MTok
• Text output: $7.50 / MTok

Quick Start​

model_list:
  - model_name: nano-banana-2.1
    litellm_params:
      model: gemini/gemini-nano-banana-2.1
      api_key: os.environ/GEMINI_API_KEY
  - model_name: nano-banana-2.1-agent-platform
    litellm_params:
      model: vertex_ai/gemini-nano-banana-2.1
      vertex_project: os.environ/VERTEX_PROJECT
      vertex_location: global

litellm --config /path/to/config.yaml

curl http://0.0.0.0:4000/v1/images/generations \
  -H "Authorization: Bearer $LITELLM_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "nano-banana-2.1",
    "prompt": "A product shot of a ceramic mug on a walnut desk, soft morning light"
  }'

import litellm

response = litellm.image_generation(
    model="gemini/gemini-nano-banana-2.1",
    prompt="A product shot of a ceramic mug on a walnut desk, soft morning light",
)

print(response.data[0].b64_json[:64])

Feedback​

Questions and feedback go in GitHub discussion #44983.