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litellm - 💡(How to fix) Fix [Feature]: Add ChatGPT Subscription provider support for GPT-5.4 mini, GPT-5.4 mini Fast, and GPT-5.4 Fast [1 participants]

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BerriAI/litellm#25954•Fetched 2026-04-18 05:52:54
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Check for existing issues

  • I have searched the existing issues and checked that my issue is not a duplicate.

The Feature

Add ChatGPT Subscription (chatgpt/) provider model entries for the newly released GPT-5.4 family models that are available through ChatGPT subscriptions:

chatgpt/gpt-5.4-mini — GPT-5.4 mini chatgpt/gpt-5.4-mini-fast — GPT-5.4 mini with Fast Mode chatgpt/gpt-5.4-fast — GPT-5.4 with Fast Mode

Motivation, pitch

I’m using the chatgpt/ provider with ChatGPT Subscription authentication, and I’d like LiteLLM to support the newer GPT-5.4 model variants exposed through ChatGPT subscriptions.

Currently, I would like to use these models through the chatgpt/ provider:

chatgpt/gpt-5.4-fast chatgpt/gpt-5.4-mini chatgpt/gpt-5.4-mini-fast

This is mainly useful for downstream tools such as Codex CLI and OpenCode, where users may want:

  • a faster GPT-5.4 option
  • a lower-cost GPT-5.4 mini option
  • a fast mode variant for GPT-5.4 mini as well

Related issues:

  • anomalyco/opencode#16499 — Request for GPT-5.4 fast mode support in OpenCode

What part of LiteLLM is this about?

Proxy

LiteLLM is hiring a founding backend engineer, are you interested in joining us and shipping to all our users?

No

Twitter / LinkedIn details

No response

extent analysis

TL;DR

Add support for the new GPT-5.4 model variants to the chatgpt/ provider in LiteLLM.

Guidance

  • Identify the existing codebase for the chatgpt/ provider and locate where model variants are defined.
  • Add new entries for the GPT-5.4 model variants (chatgpt/gpt-5.4-mini, chatgpt/gpt-5.4-mini-fast, chatgpt/gpt-5.4-fast) to the provider's configuration or model registry.
  • Verify that the new model variants are correctly integrated with ChatGPT Subscription authentication.
  • Test the new model variants with downstream tools such as Codex CLI and OpenCode to ensure compatibility.

Example

No code snippet is provided as the issue does not contain sufficient code context.

Notes

The solution assumes that the chatgpt/ provider is modular and extensible, allowing for easy addition of new model variants. If the provider's architecture is more rigid, additional refactoring may be required.

Recommendation

Apply workaround by adding support for the new GPT-5.4 model variants to the chatgpt/ provider, as there is no indication of an existing fix or upgrade available.

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