Assistant: Support models hosted on Snowflake/Cortex

[jthomasmock]

Preview Support for LLMs hosted in Snowflake Cortex: https://www.snowflake.com/en/product/features/cortex/

[chetan-posit]

Mini PRD here: https://docs.google.com/document/d/11n-snvHuyRvmzCpWFkR1btFk57ajBfkHvH78XYoq3KI/edit?usp=sharing

[sharon-wang]

Preview Support for Snowflake Cortex

Auth Methods

• API Key (Snowflake PAT) + Account Identifier/Snowflake Base Url (for Desktop users and Positron devs)
• Workbench Managed Credentials (auto-detect OAuth tokens) via connections.toml

Models

• Hardcoded list
  • Claude Sonnet 4
  • Claude Sonnet 4.5
  • Claude Haiku 4.5
  • GPT-5
  • GPT-4.1
• Hardcoded list can be overridden with positron.assistant.configuredModels using the snowflake-cortex provider ID

Screenshots and Additional Detail

• See https://github.com/posit-dev/positron/pull/10749

Caveats

• getPlot tool currently does not work due to https://github.com/posit-dev/positron/issues/10759
• Token usage is not available

[jonvanausdeln]

After a few minutes of being logged into Snowflake, I see an OAuth error

[jonvanausdeln]

Verified Fixed

Positron Version(s) : 2025.12.0-166 Workbench Version(s): 2025.12.0-daily+370.pro1 OS Version(s) : Windows 11

Test scenario(s)

Snowflake provider is now working.. and auto-signs into the provider when the managed credentials are set.

I also don't see the OAuth error for refresh any longer.