[ENHANCEMENT] Add support for GPT-5.4 Thinking and GPT-5.4-Codex via ChatGPT Plus/Pro Provider

[marcsmadja]

Problem (one or two sentences)

OpenAI recently released the GPT-5.4 model family (March 5, 2026), which includes significant upgrades to reasoning, agentic workflows, and native computer-use capabilities. Currently, users of the "OpenAI – ChatGPT Plus/Pro" provider in Roo Code cannot select these models from the dropdown menu, preventing them from utilizing the latest frontier model performance within their subscription.

Context (who is affected and when)

Release Date: March 5, 2026.

API Model IDs (for reference): gpt-5.4, gpt-5.4-pro, and the latest Codex iterations.

Performance: GPT-5.4 scores 83.0% on GDPval and 57.7% on SWE-bench Pro, making it a critical upgrade for an agentic tool like Roo Code.

Desired behavior (conceptual, not technical)

I would like to see GPT-5.4 Thinking and GPT-5.4-Codex added to the model selector for the OpenAI – ChatGPT Plus/Pro provider.

Specifically:

GPT-5.4 Thinking: To leverage the new "upfront planning" and improved deep web research during coding tasks.

GPT-5.4-Codex: To take advantage of the 1M token context window and enhanced tool-use efficiency.

Computer Use Support: If possible, enable the experimental agentic computer-use capabilities now native to GPT-5.4.

Constraints / preferences (optional)

No response

Request checklist

• I've searched existing Issues and Discussions for duplicates
• This describes a specific problem with clear context and impact

Roo Code Task Links (optional)

No response

Acceptance criteria (optional)

No response

Proposed approach (optional)

No response

Trade-offs / risks (optional)

No response

[roomote-v0]

I've analyzed this issue and here's my proposed implementation plan:

The GPT-5.4 model already exists in the OpenAI Native (API key) provider but is missing from the OpenAI Codex (ChatGPT Plus/Pro) provider. The fix is straightforward:

1. Add gpt-5.4 and gpt-5.4-codex to openAiCodexModels in packages/types/src/providers/openai-codex.ts

• gpt-5.4: General-purpose model with reasoning/thinking capabilities, 1M+ token context window, subscription-based (zero cost). Supports reasoning effort levels including "none" for non-thinking mode and up to "xhigh" for deep planning.
• gpt-5.4-codex: Codex-optimized variant for agentic coding with 1M token context window, subscription-based (zero cost). Uses apply_patch tool format consistent with other Codex models.

Both entries will mirror the capabilities from the openAiNativeModels gpt-5.4 entry but with zero pricing (subscription-based) and without tier/cache pricing fields, consistent with existing Codex model entries.

2. Update default model ID

• Change openAiCodexDefaultModelId from gpt-5.3-codex to gpt-5.4-codex since it is the latest flagship Codex model.

3. Update tests in src/api/providers/__tests__/openai-codex.spec.ts to cover the new models.

No changes needed to the handler code itself (openai-codex.ts) since the getModel() method already resolves models dynamically from the openAiCodexModels map.

Note: The "Computer Use" capability mentioned in the issue is a separate feature that would require significant additional work beyond model registration and is out of scope for this change.

Please mention @roomote in a comment saying that you approve this plan, and I'll proceed with the implementation.

[marcsmadja]

@roomote I approve this plan

[roomote-v0]

I've seen the approval and will proceed with the implementation. I'll open a draft PR shortly to share progress.

[roomote-v0]

Opened a draft PR with my attempt at addressing this: #11888

Adds gpt-5.4 and gpt-5.4-codex to the OpenAI Codex (ChatGPT Plus/Pro) provider and updates the default model to gpt-5.4-codex. All tests and type checks pass. Feedback welcome!

[marcsmadja]

Looking forward to this! Let me know if you need me to test this locally.

…

On Sat, Mar 7, 2026 at 4:31 PM roomote-v0[bot] ***@***.***> wrote: *roomote-v0[bot]* left a comment (RooCodeInc/Roo-Code#11887) <#11887 (comment)> Opened a draft PR with my attempt at addressing this: #11888 <#11888> Adds gpt-5.4 and gpt-5.4-codex to the OpenAI Codex (ChatGPT Plus/Pro) provider and updates the default model to gpt-5.4-codex. All tests and type checks pass. Feedback welcome! — Reply to this email directly, view it on GitHub <#11887 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/BEY6U75FU3PA3S56ACFTIQL4PSILTAVCNFSM6AAAAACWKSR5ZOVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHM2DAMJXGQYTOOJRGM> . You are receiving this because you authored the thread.Message ID: ***@***.***>

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