[BOT ISSUE] Databricks: add missing `databricks-claude-sonnet-4-5`, `databricks-claude-opus-4-6`, `databricks-claude-sonnet-4`

[github-actions]

Summary

Three Databricks-hosted Anthropic Claude models are missing from packages/proxy/schema/model_list.json. This is a follow-up to #559, #585, and #591, continuing to address the Databricks catalog gap.

Missing Model IDs

Model ID	Underlying Model	Available Regions
databricks-claude-sonnet-4-5	Claude Sonnet 4.5	15+ regions
databricks-claude-opus-4-6	Claude Opus 4.6	15+ regions
databricks-claude-sonnet-4	Claude Sonnet 4	15+ regions (pay-per-token + provisioned throughput)

Details

All three models appear in the Azure Databricks foundation model overview regional availability table (updated 2026-05-19). databricks-claude-sonnet-4 is notably available in both pay-per-token and provisioned throughput tiers across all supported regions.

The catalog already has databricks-claude-3-7-sonnet (deprecated) but none of the Claude 4.x Databricks variants.

Suggested entries

"databricks-claude-sonnet-4-5": {
  "format": "openai",
  "flavor": "chat",
  "displayName": "Claude Sonnet 4.5",
  "available_providers": ["databricks"]
},
"databricks-claude-opus-4-6": {
  "format": "openai",
  "flavor": "chat",
  "displayName": "Claude Opus 4.6",
  "available_providers": ["databricks"]
},
"databricks-claude-sonnet-4": {
  "format": "openai",
  "flavor": "chat",
  "displayName": "Claude Sonnet 4",
  "available_providers": ["databricks"]
}

Pricing omitted per Databricks provider constraints.

Additional missing Databricks Claude models (not covered here or in #559)

• databricks-claude-haiku-4-5, databricks-claude-opus-4-5, databricks-claude-opus-4-1

Verification checklist

• Cross-source: Model IDs confirmed on Azure Databricks foundation model overview and AWS Databricks supported models
• Recent commits: Not covered by any recent commit to model_list.json
• ID format: Follows existing databricks-claude-* 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, or [BOT ISSUE] Databricks: add missing databricks-llama-4-maverick, databricks-gpt-oss-120b, databricks-gemma-3-12b #591