[BOT ISSUE] Databricks: add missing `databricks-gemini-3-flash`, `databricks-gemini-3-1-flash-lite`, `databricks-gpt-oss-20b`

[github-actions]

Summary

Three Databricks Foundation Model API pay-per-token models are missing from packages/proxy/schema/model_list.json. This is a follow-up to #559, #585, #591, #592, #638, #639, and #640, continuing to address the Databricks catalog gap.

Missing Model IDs

Model ID	Context Window	Max Output	Supported Inputs	Description
databricks-gemini-3-flash	not published	not published	text, image, video, audio	High-speed, cost-efficient multimodal AI model
databricks-gemini-3-1-flash-lite	not published	not published	text, image, video, audio	Fastest and most cost-efficient model in the Gemini 3 series
databricks-gpt-oss-20b	128,000	not published	text	Lightweight reasoning model, excels at real-time copilots

Suggested entries

"databricks-gemini-3-flash": {
  "format": "openai",
  "flavor": "chat",
  "multimodal": true,
  "displayName": "Gemini 3 Flash",
  "available_providers": ["databricks"]
},
"databricks-gemini-3-1-flash-lite": {
  "format": "openai",
  "flavor": "chat",
  "multimodal": true,
  "displayName": "Gemini 3.1 Flash Lite",
  "available_providers": ["databricks"]
},
"databricks-gpt-oss-20b": {
  "format": "openai",
  "flavor": "chat",
  "displayName": "GPT-OSS 20B",
  "max_input_tokens": 128000,
  "available_providers": ["databricks"]
}

Pricing omitted per Databricks provider constraints (no stable public per-model pricing source).

Verification checklist

• Cross-source: Model IDs confirmed on Foundation model overview and Supported models page
• Recent commits: Not covered by any recent commit to model_list.json
• ID format: Follows existing databricks-<model> naming convention
• Existing issues: Not covered by [BOT ISSUE] Databricks: add missing databricks-claude-opus-4-7, databricks-claude-sonnet-4-6, databricks-gpt-5-5 #559, [BOT ISSUE] Databricks: add missing databricks-gpt-5-5-pro, databricks-gemini-3-5-flash, databricks-gpt-5-4-mini #585, [BOT ISSUE] Databricks: add missing databricks-llama-4-maverick, databricks-gpt-oss-120b, databricks-gemma-3-12b #591, [BOT ISSUE] Databricks: add missing databricks-claude-sonnet-4-5, databricks-claude-opus-4-6, databricks-claude-sonnet-4 #592, [BOT ISSUE] Databricks: add missing databricks-gpt-5-4, databricks-gpt-5-4-nano, databricks-gpt-5-2 #638, [BOT ISSUE] Databricks: add missing databricks-gemini-3-1-pro, databricks-gemini-2-5-pro, databricks-gemini-2-5-flash #639, or [BOT ISSUE] Databricks: add missing databricks-claude-haiku-4-5, databricks-claude-opus-4-5, databricks-claude-opus-4-1 #640

Verification notes

Field	Source	Notes
Model IDs	Foundation model overview + Supported models page	Listed in both pay-per-token model tables
Context window (128K for gpt-oss-20b)	Supported models page	"128K token context window"
Context windows for Gemini models	NOT PUBLISHED	Not specified on the supported models page
format: "openai", flavor: "chat"	Catalog convention	All Databricks models use openai format
multimodal: true (Gemini models)	Supported models page	Inputs: text, image, video, audio
multimodal (gpt-oss-20b)	Supported models page	Text-only input
input_cost_per_mil_tokens / output_cost_per_mil_tokens	NOT PUBLISHED	Databricks does not publish stable per-model pricing

Local files inspected

• packages/proxy/schema/model_list.json — grep for databricks-gemini-3-flash, databricks-gemini-3-1-flash-lite, and databricks-gpt-oss-20b returns no matches

Source URLs

• https://docs.databricks.com/aws/en/machine-learning/model-serving/foundation-model-overview
• https://docs.databricks.com/aws/en/machine-learning/foundation-model-apis/supported-models

{
  "kind": "missing_model",
  "provider": "databricks",
  "models": ["databricks-gemini-3-flash", "databricks-gemini-3-1-flash-lite", "databricks-gpt-oss-20b"],
  "status": "active",
  "model_specs": {
    "databricks-gemini-3-flash": {
      "format": "openai",
      "flavor": "chat",
      "multimodal": true,
      "displayName": "Gemini 3 Flash",
      "available_providers": ["databricks"]
    },
    "databricks-gemini-3-1-flash-lite": {
      "format": "openai",
      "flavor": "chat",
      "multimodal": true,
      "displayName": "Gemini 3.1 Flash Lite",
      "available_providers": ["databricks"]
    },
    "databricks-gpt-oss-20b": {
      "format": "openai",
      "flavor": "chat",
      "displayName": "GPT-OSS 20B",
      "max_input_tokens": 128000,
      "available_providers": ["databricks"]
    }
  },
  "source_urls": [
    "https://docs.databricks.com/aws/en/machine-learning/model-serving/foundation-model-overview",
    "https://docs.databricks.com/aws/en/machine-learning/foundation-model-apis/supported-models"
  ]
}

[github-actions]

Prepared catalog updates for databricks-gemini-3-flash, databricks-gemini-3-1-flash-lite, databricks-gpt-oss-20b. Added models: databricks-gemini-3-flash, databricks-gemini-3-1-flash-lite, databricks-gpt-oss-20b.

Verification sources: https://docs.databricks.com/aws/en/machine-learning/model-serving/foundation-model-overview, https://docs.databricks.com/aws/en/machine-learning/foundation-model-apis/supported-models, https://ai.google.dev/gemini-api/docs/gemini-3, https://huggingface.co/openai/gpt-oss-20b
Verified metadata applied:

• databricks-gemini-3-flash: format=openai, flavor=chat, displayName=Gemini 3 Flash, max_input_tokens=1048576, max_output_tokens=65536, pricing=not provided, providers=databricks, multimodal=true
• databricks-gemini-3-1-flash-lite: format=openai, flavor=chat, displayName=Gemini 3.1 Flash-Lite, max_input_tokens=1048576, max_output_tokens=65536, pricing=not provided, providers=databricks, multimodal=true
• databricks-gpt-oss-20b: format=openai, flavor=chat, displayName=GPT-OSS 20B, max_input_tokens=131072, max_output_tokens=not provided, pricing=not provided, providers=databricks, reasoning=true

Opened #653 to apply the catalog update.