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Install Codex

npm i -g @openai/codex

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Configure Codex to Use Vivgrid (GPT-5.1-Codex)

Copy the following configuration files to your codex config file.
~/.codex/config.toml
model = "gpt-5.2-codex"
model_provider = "vivgrid"
model_reasoning_summary = "detailed"
model_verbosity = "medium"
model_reasoning_effort = "high"

[features]
streamable_shell = true
web_search_request = true

[model_providers.vivgrid]
name = "Vivgrid"
base_url = "https://api.vivgrid.com/v1"
env_key = "VIVGRID_KEY"
wire_api = "responses"

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Start Using Codex with Vivgrid

Get Vivgrid API Key from your Vivgrid Console. 
export VIVGRID_KEY="your_vivgrid_api_key"
codex run "hello world"

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Visual Studio Code Codex Extension

This configuration also works with the Visual Studio Code Codex Extension. Just make sure to set the environment variable VIVGRID_KEY in your system or in the VS Code settings.