feat(opencode): add Open WebUI provider

[SamirMoustafa]

Issue for this PR

Closes #13537

Builds on feat: add provider openWebUI #14341 (thanks @PapeThePope).

Type of change

• Bug fix
• New feature
• Refactor / code improvement
• Documentation

What does this PR do?

Adds Open WebUI as a provider (OpenAI-compatible API): login/connection in CLI and TUI, listing and models, handling for gzip/chunked streams, docs, and tests.

Files: packages/opencode/src/cli/cmd/providers.ts, packages/opencode/src/cli/cmd/tui/component/dialog-provider.tsx, packages/opencode/src/config/paths.ts, packages/opencode/src/provider/models.ts, packages/opencode/src/provider/provider.ts, packages/opencode/src/provider/transform.ts, packages/opencode/src/server/routes/provider.ts, packages/opencode/test/provider/transform.test.ts, packages/web/src/content/docs/providers.mdx.

How did you verify your code works?

• bun typecheck in packages/opencode
• Manual: Open WebUI URL + API key via CLI/TUI, model list and a short chat/streaming run

Screenshots / recordings

N/A (CLI/TUI text flows).

Checklist

• I have tested my changes locally
• I have not included unrelated changes in this PR

[github-actions]

Hey! Your PR title Add Open WebUI Provider doesn't follow conventional commit format.

Please update it to start with one of:

• feat: or feat(scope): new feature
• fix: or fix(scope): bug fix
• docs: or docs(scope): documentation changes
• chore: or chore(scope): maintenance tasks
• refactor: or refactor(scope): code refactoring
• test: or test(scope): adding or updating tests

Where scope is the package name (e.g., app, desktop, opencode).

See CONTRIBUTING.md for details.

[github-actions]

The following comment was made by an LLM, it may be inaccurate:

Potential Duplicate Found:

• PR feat: add provider openWebUI #14341: feat: add provider openWebUI
  • This PR is directly related as it's the original work that PR feat(opencode): add Open WebUI provider #18306 is built upon. The current PR (feat(opencode): add Open WebUI provider #18306) explicitly mentions it builds on PR feat: add provider openWebUI #14341.

The current PR (#18306) appears to be an updated or refactored version of the Open WebUI provider feature originally introduced in PR #14341. The description acknowledges this relationship, so these two PRs are related but the current one seems to be a successor/improvement to the earlier work.

[github-actions]

Thanks for updating your PR! It now meets our contributing guidelines. 👍

[SamirMoustafa]

Open WebUI + Ollama (local smoke test)

Download docker-compose.yml

docker compose up -d
docker compose exec ollama ollama pull qwen2.5:0.5b

Open http://localhost:3001 → admin signup → Settings → Account → API keys → create a key.

// Optional
export OPEN_WEBUI_BASE_URL=http://localhost:3001
export OPEN_WEBUI_API_KEY=…

Stop: docker compose down (volumes: docker compose down -v).
Ports: Web UI defaults to 3001 (OPEN_WEBUI_PORT in docker-compose.yml). Run docker compose only under infra/open-webui-local or add -f infra/open-webui-local/docker-compose.yml.

Screen.Recording.2026-03-20.at.2.15.07.AM.mov