[BOT ISSUE] Databricks: add missing `databricks-claude-opus-4-8`, `databricks-gpt-oss-120b`, `databricks-llama-4-maverick`

[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, #640, #641, #642, and #643, continuing to address the Databricks catalog gap.

Missing Model IDs

Model ID	Context Window	Max Output	Supported Inputs	Description
databricks-claude-opus-4-8	not published	not published	text, image	Anthropic's most capable hybrid reasoning model for complex extraction and agentic reasoning
databricks-gpt-oss-120b	128,000	not published	text	OpenAI's flagship open-weight reasoning model with chain-of-thought
databricks-llama-4-maverick	not published	not published	text, image	Meta's mixture-of-experts model optimized for image and text understanding

Suggested entries

"databricks-claude-opus-4-8": {
  "format": "openai",
  "flavor": "chat",
  "multimodal": true,
  "displayName": "Claude Opus 4.8",
  "available_providers": ["databricks"]
},
"databricks-gpt-oss-120b": {
  "format": "openai",
  "flavor": "chat",
  "displayName": "GPT-OSS 120B",
  "max_input_tokens": 128000,
  "available_providers": ["databricks"]
},
"databricks-llama-4-maverick": {
  "format": "openai",
  "flavor": "chat",
  "multimodal": true,
  "displayName": "Llama 4 Maverick",
  "available_providers": ["databricks"]
}

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

Verification checklist

• Cross-source: Model IDs confirmed on two independent Databricks documentation pages:
  1. Foundation model overview — lists all pay-per-token serverless models in the regional availability table
  2. Supported models (Foundation Model APIs) — detailed table with model IDs, context windows, and supported input types
• Recent commits: Not covered by any recent commit to model_list.json
• ID format: Follows existing databricks-<model> naming convention (e.g., databricks-meta-llama-3-3-70b-instruct, databricks-meta-llama-3-1-405b-instruct)
• 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, [BOT ISSUE] Databricks: add missing databricks-claude-haiku-4-5, databricks-claude-opus-4-5, databricks-claude-opus-4-1 #640, [BOT ISSUE] Databricks: add missing databricks-gpt-5, databricks-gpt-5-1, databricks-gpt-5-mini #641, [BOT ISSUE] Databricks: add missing databricks-gpt-5-nano, databricks-gpt-5-3-codex, databricks-gpt-5-2-codex #642, or [BOT ISSUE] Databricks: add missing databricks-gemini-3-flash, databricks-gemini-3-1-flash-lite, databricks-gpt-oss-20b #643. Searched for databricks-claude-opus-4-8, databricks-gpt-oss-120b, and databricks-llama-4-maverick in issue titles — zero results.

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-120b)	Supported models page	"128K token context window"
Context windows for Claude/Llama	NOT PUBLISHED	Not specified on the supported models page
format: "openai", flavor: "chat"	Catalog convention	All Databricks models use openai format
multimodal: true (Claude, Llama)	Supported models page	Inputs: text, image
multimodal (gpt-oss-120b)	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
max_output_tokens	NOT PUBLISHED	Not specified for any of these models
reasoning	NOT VERIFIED	Not confirmed for Databricks-hosted versions

Local files inspected

• packages/proxy/schema/model_list.json — grep for databricks-claude-opus-4-8, databricks-gpt-oss-120b, and databricks-llama-4-maverick returns no matches
• Existing Databricks entries at lines 9198–9233 used as reference pattern

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-claude-opus-4-8", "databricks-gpt-oss-120b", "databricks-llama-4-maverick"],
  "status": "active",
  "model_specs": {
    "databricks-claude-opus-4-8": {
      "format": "openai",
      "flavor": "chat",
      "multimodal": true,
      "displayName": "Claude Opus 4.8",
      "available_providers": ["databricks"]
    },
    "databricks-gpt-oss-120b": {
      "format": "openai",
      "flavor": "chat",
      "displayName": "GPT-OSS 120B",
      "max_input_tokens": 128000,
      "available_providers": ["databricks"]
    },
    "databricks-llama-4-maverick": {
      "format": "openai",
      "flavor": "chat",
      "multimodal": true,
      "displayName": "Llama 4 Maverick",
      "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"
  ]
}

Summary: Add three missing Databricks Foundation Model API entries to the catalog. All model IDs verified from two independent official Databricks documentation pages. Pricing omitted per provider constraints.

[github-actions]

Prepared catalog updates for databricks-claude-opus-4-8, databricks-gpt-oss-120b, databricks-llama-4-maverick. Added models: databricks-claude-opus-4-8, databricks-gpt-oss-120b, databricks-llama-4-maverick.

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://huggingface.co/meta-llama/Llama-4-Maverick-17B-128E-Instruct
Verified metadata applied:

• databricks-claude-opus-4-8: format=openai, flavor=chat, displayName=Claude Opus 4.8, max_input_tokens=1000000, max_output_tokens=128000, pricing=not provided, providers=databricks, reasoning=true, multimodal=true
• databricks-gpt-oss-120b: format=openai, flavor=chat, displayName=GPT-OSS 120B, max_input_tokens=128000, max_output_tokens=not provided, pricing=not provided, providers=databricks, reasoning=true
• databricks-llama-4-maverick: format=openai, flavor=chat, displayName=Llama 4 Maverick, max_input_tokens=1000000, max_output_tokens=not provided, pricing=not provided, providers=databricks, multimodal=true

Opened #702 to apply the catalog update.