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[GH-ISSUE #21266] Bug: Model grok-4-1-fast-reasoning does not support parameter presencePenalty #34954

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opened 2026-04-25 09:07:55 -05:00 by GiteaMirror · 1 comment
GiteaMirror commented 2026-04-25 09:07:55 -05:00
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Originally created by @mysteryx93 on GitHub (Feb 8, 2026).
Original GitHub issue: https://github.com/open-webui/open-webui/issues/21266

Check Existing Issues

  • I have searched for any existing and/or related issues.
  • I have searched for any existing and/or related discussions.
  • I have also searched in the CLOSED issues AND CLOSED discussions and found no related items (your issue might already be addressed on the development branch!).
  • I am using the latest version of Open WebUI.

Installation Method

Docker

Open WebUI Version

v0.7.2

Ollama Version (if applicable)

No response

Operating System

Garuda Linux

Browser (if applicable)

No response

Confirmation

  • I have read and followed all instructions in README.md.
  • I am using the latest version of both Open WebUI and Ollama.
  • I have included the browser console logs.
  • I have included the Docker container logs.
  • I have provided every relevant configuration, setting, and environment variable used in my setup.
  • I have clearly listed every relevant configuration, custom setting, environment variable, and command-line option that influences my setup (such as Docker Compose overrides, .env values, browser settings, authentication configurations, etc).
  • I have documented step-by-step reproduction instructions that are precise, sequential, and leave nothing to interpretation. My steps:
  • Start with the initial platform/version/OS and dependencies used,
  • Specify exact install/launch/configure commands,
  • List URLs visited, user input (incl. example values/emails/passwords if needed),
  • Describe all options and toggles enabled or changed,
  • Include any files or environmental changes,
  • Identify the expected and actual result at each stage,
  • Ensure any reasonably skilled user can follow and hit the same issue.

Expected Behavior

Grok model should be supported

Actual Behavior

Error when sending query:
Model grok-4-1-fast-reasoning does not support parameter presencePenalty.

Steps to Reproduce

In settings, add Connection
URL: https://api.x.ai/v1
Auth bearer: xAI API key
Model: grok-4-1-fast-reasoning
Save
(Make sure billing is setup in xAI)

Chat with that model. It gives the error.

Logs & Screenshots

The error is very self-explanatory: Grok's API is OpenAI-compatible, but does not support all parameters. presencePenalty is not supported, and perhaps other parameters as well.

Additional Information

No response

Originally created by @mysteryx93 on GitHub (Feb 8, 2026). Original GitHub issue: https://github.com/open-webui/open-webui/issues/21266 ### Check Existing Issues - [x] I have searched for any existing and/or related issues. - [x] I have searched for any existing and/or related discussions. - [x] I have also searched in the CLOSED issues AND CLOSED discussions and found no related items (your issue might already be addressed on the development branch!). - [x] I am using the latest version of Open WebUI. ### Installation Method Docker ### Open WebUI Version v0.7.2 ### Ollama Version (if applicable) _No response_ ### Operating System Garuda Linux ### Browser (if applicable) _No response_ ### Confirmation - [x] I have read and followed all instructions in `README.md`. - [x] I am using the latest version of **both** Open WebUI and Ollama. - [x] I have included the browser console logs. - [x] I have included the Docker container logs. - [x] I have **provided every relevant configuration, setting, and environment variable used in my setup.** - [x] I have clearly **listed every relevant configuration, custom setting, environment variable, and command-line option that influences my setup** (such as Docker Compose overrides, .env values, browser settings, authentication configurations, etc). - [x] I have documented **step-by-step reproduction instructions that are precise, sequential, and leave nothing to interpretation**. My steps: - Start with the initial platform/version/OS and dependencies used, - Specify exact install/launch/configure commands, - List URLs visited, user input (incl. example values/emails/passwords if needed), - Describe all options and toggles enabled or changed, - Include any files or environmental changes, - Identify the expected and actual result at each stage, - Ensure any reasonably skilled user can follow and hit the same issue. ### Expected Behavior Grok model should be supported ### Actual Behavior Error when sending query: Model grok-4-1-fast-reasoning does not support parameter presencePenalty. ### Steps to Reproduce In settings, add Connection URL: https://api.x.ai/v1 Auth bearer: xAI API key Model: grok-4-1-fast-reasoning Save (Make sure billing is setup in xAI) Chat with that model. It gives the error. ### Logs & Screenshots The error is very self-explanatory: Grok's API is OpenAI-compatible, but does not support all parameters. presencePenalty is not supported, and perhaps other parameters as well. ### Additional Information _No response_
GiteaMirror added the bug label 2026-04-25 09:07:55 -05:00
GiteaMirror commented 2026-04-25 09:07:57 -05:00
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@pr-validator-bot commented on GitHub (Feb 8, 2026):

⚠️ Missing Issue Title Prefix

@mysteryx93, 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:3868567402 --> @pr-validator-bot commented on GitHub (Feb 8, 2026): # ⚠️ Missing Issue Title Prefix @mysteryx93, 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`
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Reference: github-starred/open-webui#34954
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