[FEATURE]: Add Modal provider support to OpenCode

[Aditya190803]

Verification

• I have searched existing issues and this feature has not already been suggested.

Description

I use Modal to run AI workloads (primarily inference and batch jobs), and I want to use the same provider directly in OpenCode.

Right now, Modal is not listed as a built-in provider in provider/connect flows, so setup is harder to discover and requires manual workarounds.

This feature would solve that by adding first-class Modal provider support so users can:

• Connect using a Modal API key in the normal provider onboarding flow
• Discover and select available Modal models in the model/provider list
• Follow clear setup docs for Modal inside OpenCode docs

Why this matters

• Reduces setup friction for existing Modal users
• Improves provider discoverability in OpenCode
• Makes onboarding faster and more consistent with other built-in providers

[github-actions]

This issue doesn't fully meet our contributing guidelines.

What needs to be fixed:

• Feature requests must use the Feature Request issue template, which requires a verification checkbox confirming the feature hasn't been suggested before and a proper description field
• The issue title must start with [FEATURE]: for feature requests

Please edit this issue to address the above within 2 hours, or it will be automatically closed.

If you believe this was flagged incorrectly, please let a maintainer know.

[github-actions]

Thanks for updating the title to include [FEATURE]: — that part is now correct.

However, the issue still doesn't fully follow our Feature Request template. Here's what still needs to be addressed:

• Verification checkbox: The Feature Request template requires a checkbox confirming you've searched existing issues to make sure this hasn't already been requested. Please include that.
• Description: The current body is a single sentence and doesn't provide enough context. Please explain the problem or need this feature would solve — why is Modal provider support useful, and what gap does it fill for users?

Please edit the issue to use the full Feature Request template structure. Let a maintainer know if you have questions.

[github-actions]

Thanks for updating the title to include [FEATURE]: — that's the right direction!

However, this issue still needs a bit more work to meet our contributing guidelines:

• Verification checkbox missing: The Feature Request template requires a checkbox confirming you've checked that this feature hasn't already been suggested.
• Description too brief: Please provide more detail about the problem or need this feature addresses — why do you want Modal provider support? What use case does it solve for you?

Please edit the issue to fill in the full Feature Request template. Let us know if you have any questions!

[github-actions]

Thanks for updating the issue! It now meets our contributing guidelines. Welcome to OpenCode!

[github-actions]

To stay organized issues are automatically closed after 60 days of no activity. If the issue is still relevant please open a new one.