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[GH-ISSUE #21136] feat: Accept 'developer' role in inbound Chat Completions API #58059

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opened 2026-05-05 22:15:34 -05:00 by GiteaMirror · 2 comments
GiteaMirror commented 2026-05-05 22:15:34 -05:00
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Originally created by @jbraseth on GitHub (Feb 3, 2026).
Original GitHub issue: https://github.com/open-webui/open-webui/issues/21136

Description

OpenWebUI's /api/chat/completions endpoint rejects messages with role: "developer", returning a Pydantic validation error. The developer role was introduced by OpenAI in early 2025 as a replacement for system in newer API versions (starting with the o1 model family). It is functionally identical to system — it carries system/instruction context.

This affects any client targeting the current OpenAI Chat Completions spec, including:

  • OpenAI Codex CLI (v0.59+)
  • OpenAI Codex VS Code extension (current versions)
  • Agent frameworks and IDE integrations using the newer OpenAI API format

Steps to Reproduce

Send a Chat Completions request to OpenWebUI's API with a developer role message:

curl -X POST https://<openwebui-instance>/api/chat/completions \
  -H "Authorization: Bearer <api-key>" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "your-model-id",
    "messages": [
      {"role": "developer", "content": "You are a helpful assistant."},
      {"role": "user", "content": "Hello"}
    ]
  }'

Expected Behavior

The request succeeds, with developer treated equivalently to system.

Actual Behavior

Pydantic validation error:

[{'type': 'literal_error', 'loc': ('body', 'messages', 0, 'SystemMessage', 'role'),
  'msg': "Input should be 'system'", 'input': 'developer'},
 {'type': 'literal_error', 'loc': ('body', 'messages', 0, 'UserMessage', 'role'),
  'msg': "Input should be 'user'", 'input': 'developer'},
 {'type': 'literal_error', 'loc': ('body', 'messages', 0, 'AssistantMessage', 'role'),
  'msg': "Input should be 'assistant'", 'input': 'developer'},
 {'type': 'literal_error', 'loc': ('body', 'messages', 0, 'ToolMessage', 'role'),
  'msg': "Input should be 'tool'", 'input': 'developer'}]

Context

OpenWebUI already handles the developer role in the outbound direction — PR #10617 maps system → developer when sending requests to o1/o3 models. This issue is about the inbound direction: accepting developer from API clients.

The fix would be adding developer as a valid role in the inbound message schema and mapping it to system before processing.

Version

OpenWebUI v0.7.2

Originally created by @jbraseth on GitHub (Feb 3, 2026). Original GitHub issue: https://github.com/open-webui/open-webui/issues/21136 ## Description OpenWebUI's `/api/chat/completions` endpoint rejects messages with `role: "developer"`, returning a Pydantic validation error. The `developer` role was introduced by OpenAI in early 2025 as a replacement for `system` in newer API versions (starting with the o1 model family). It is functionally identical to `system` — it carries system/instruction context. This affects any client targeting the current OpenAI Chat Completions spec, including: - OpenAI Codex CLI (v0.59+) - OpenAI Codex VS Code extension (current versions) - Agent frameworks and IDE integrations using the newer OpenAI API format ## Steps to Reproduce Send a Chat Completions request to OpenWebUI's API with a `developer` role message: ```bash curl -X POST https://<openwebui-instance>/api/chat/completions \ -H "Authorization: Bearer <api-key>" \ -H "Content-Type: application/json" \ -d '{ "model": "your-model-id", "messages": [ {"role": "developer", "content": "You are a helpful assistant."}, {"role": "user", "content": "Hello"} ] }' ``` ## Expected Behavior The request succeeds, with `developer` treated equivalently to `system`. ## Actual Behavior Pydantic validation error: ``` [{'type': 'literal_error', 'loc': ('body', 'messages', 0, 'SystemMessage', 'role'), 'msg': "Input should be 'system'", 'input': 'developer'}, {'type': 'literal_error', 'loc': ('body', 'messages', 0, 'UserMessage', 'role'), 'msg': "Input should be 'user'", 'input': 'developer'}, {'type': 'literal_error', 'loc': ('body', 'messages', 0, 'AssistantMessage', 'role'), 'msg': "Input should be 'assistant'", 'input': 'developer'}, {'type': 'literal_error', 'loc': ('body', 'messages', 0, 'ToolMessage', 'role'), 'msg': "Input should be 'tool'", 'input': 'developer'}] ``` ## Context OpenWebUI already handles the `developer` role in the **outbound** direction — PR #10617 maps `system` → `developer` when sending requests to o1/o3 models. This issue is about the **inbound** direction: accepting `developer` from API clients. The fix would be adding `developer` as a valid role in the inbound message schema and mapping it to `system` before processing. ## Version OpenWebUI v0.7.2
GiteaMirror commented 2026-05-05 22:15:36 -05:00
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@pr-validator-bot commented on GitHub (Feb 3, 2026):

⚠️ Missing Issue Title Prefix

@jbraseth, your issue title is missing a prefix (e.g., bug:, feat:, docs:).

Please update your issue title to include one of the following prefixes:

  • bug: Bug report or error you've encountered
  • feat: Feature request or enhancement suggestion
  • docs: Documentation issue or improvement request
  • question: Question about usage or functionality
  • help: Request for help or support

Example: bug: Login fails when using special characters in password

<!-- gh-comment-id:3842799433 --> @pr-validator-bot commented on GitHub (Feb 3, 2026): # ⚠️ Missing Issue Title Prefix @jbraseth, your issue title is missing a prefix (e.g., `bug:`, `feat:`, `docs:`). Please update your issue title to include one of the following prefixes: - **bug**: Bug report or error you've encountered - **feat**: Feature request or enhancement suggestion - **docs**: Documentation issue or improvement request - **question**: Question about usage or functionality - **help**: Request for help or support Example: `bug: Login fails when using special characters in password`
GiteaMirror commented 2026-05-05 22:15:37 -05:00
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@tjbck commented on GitHub (Feb 6, 2026):

This is unlikely to be caused by our backend, I'd encourage you to try again with another inference provider to make sure the error is occurring from open webui.

<!-- gh-comment-id:3857138410 --> @tjbck commented on GitHub (Feb 6, 2026): This is unlikely to be caused by our backend, I'd encourage you to try again with another inference provider to make sure the error is occurring from open webui.
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Reference: github-starred/open-webui#58059
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