This release adds support for multiple cell ranges in PROMPT functions, adds OpenRouter model provider, and includes bug fixes and improvements.

⚠️ Breaking Changes

Excel UDF Function Signature Change

The PROMPT and PROMPTMODEL functions now accept multiple cell ranges instead of a temperature parameter:

• Old signature: =PROMPT(instructions, A1:D4, 0.7)
• New signature: =PROMPT(instructions, A1:D4, F10, K11:O30)

Temperature is now configured solely through the ribbon UI. This change enables passing multiple cells and cell ranges as context to your prompts.

Migration: Remove the temperature parameter from your =PROMPTs.

What's New

• OpenRouter Provider: Connect to 200+ AI models through OpenRouter, giving you access to a wide variety of language models from different providers in one place
• Mistral Large Support: Added support for Mistral's flagship large language model
• Test Suite: Introduced comprehensive test coverage to improve reliability and maintainability
• Excel-DNA Update: Updated to Excel-DNA v1.9.0 for better performance and compatibility

Bug Fixes

• Fixed incorrect ChatRole usage in AddAssistantMessage method
• Improved provider name logging for better debugging

What's Changed

• build(deps): bump actions/checkout from 5 to 6 by @dependabot[bot] in https://github.com/getcellm/cellm/pull/307
• feat: Add OpenRouter provider by @kaspermarstal in https://github.com/getcellm/cellm/pull/308
• feat: Add Mistral Large by @kaspermarstal in https://github.com/getcellm/cellm/pull/310
• feat!: Support multiple cell ranges in PROMPT functions by @kaspermarstal in https://github.com/getcellm/cellm/pull/312
• docs: Add temperature preset details to PROMPT and PROMPTMODEL functions docs by @kaspermarstal in https://github.com/getcellm/cellm/pull/313
• build: Update Excel-DNA to v1.9.0 by @kaspermarstal in https://github.com/getcellm/cellm/pull/314
• feat: Add tests by @kaspermarstal in https://github.com/getcellm/cellm/pull/316
• fix: Log provider name by @kaspermarstal in https://github.com/getcellm/cellm/pull/318
• fix: Use ChatRole.Assistant in AddAssistantMessage method by @kaspermarstal in https://github.com/getcellm/cellm/pull/319
• chore: bump version to v0.5.0 by @kaspermarstal in https://github.com/getcellm/cellm/pull/320

Full Changelog: https://github.com/getcellm/cellm/compare/v0.4.1...v0.5.0