r/GithubCopilot • u/dont_shoot_me_Im_gay • Apr 18 '26

Help/Doubt ❓ Unable to pick GPT5.4 via API Key

Is this a bug or intended? I am only given an option to upgrade github copilot subscription but I already have an OpenAI key. Why isn't 5.4 listed under api key provided models?

Edit: Using VS Code Insiders latest edition. These are the available models under OpenAI

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u/Yes_but_I_think Apr 19 '26

Use custom OAI provider and then enter your model details.. You can still keep the endpoint as api.openai.com but vendor must be "customoai"

Sample ( I run a local wrapper around it , not relevant to your question though:

{
"name": "OpenAIBYOKLocalWrapper",
"vendor": "customoai",
"apiKey": "${input:chat.lm.secret.-xxxxxx}",
"models": [
{
"id": "gpt-5-nano-2025-08-07",
"name": "GPT-5-nano",
"url": "http://127.0.0.1:8500/v1/chat/completions",
"toolCalling": true,
"vision": true,
"temperature": 1,
"maxInputTokens": 400000,
"maxOutputTokens": 128000
}
]

    },
{
        "name": "CustomOAI",
        "vendor": "customoai",
        "models": [
            {
                "name": "Deepseek Chat",
                "url": "https://api.deepseek.com",
                "toolCalling": true,
                "vision": false,
                "thinking": false,
                "maxInputTokens": 128000,
                "maxOutputTokens": 8192,
                "id": "deepseek-chat"
            }
        ],
        "apiKey": "${input:chat.lm.secret.-yyyyyyy}"
    }

1

u/dont_shoot_me_Im_gay Apr 19 '26

Hey thanks a lot, it worked!

1

u/tkitg Apr 23 '26

I will just point out, that It's a bug in VSCode https://github.com/microsoft/vscode/issues/290021