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Using TexAPI with OpenAI Codex CLI

What is Codex CLI?

Codex CLI is OpenAI's terminal-based coding agent. It can understand your codebase, generate code, and execute commands.

Why use TexAPI with Codex?

  • Up to 70% cheaper than official OpenAI pricing
  • Access GPT-5.5, GPT-5.4 and all latest models
  • No region restrictions
  • Same OpenAI-compatible API

Setup

macOS / Linux

export OPENAI_BASE_URL=https://texapi.dev/v1
export OPENAI_API_KEY=tex-YOUR_API_KEY

Add to ~/.bashrc or ~/.zshrc for persistence.

Windows (PowerShell)

$env:OPENAI_BASE_URL = "https://texapi.dev/v1"
$env:OPENAI_API_KEY = "tex-YOUR_API_KEY"

Windows (CMD)

set OPENAI_BASE_URL=https://texapi.dev/v1
set OPENAI_API_KEY=tex-YOUR_API_KEY

Verify

codex "explain this codebase"

Supported Features

Feature Status
Chat Completions ✅
Streaming ✅
Responses API ✅
Function Calling ✅
File Operations ✅

Recommended Models

Model Best For Cost
gpt-5.4 Daily coding 0.75 / 4.5 credits per 1M tokens
gpt-5.5 Complex tasks 1.5 / 9.0 credits per 1M tokens
gpt-5.4-mini Quick tasks 0.225 / 1.35 credits per 1M tokens
gpt-5.4-nano Ultra-cheap 0.06 / 0.375 credits per 1M tokens

Troubleshooting

"Invalid API key"

  • TexAPI keys start with tex-, not sk-
  • Ensure OPENAI_BASE_URL points to https://texapi.dev/v1 (with /v1)

"Model not found"

  • Use TexAPI model names: gpt-5.4, not gpt-4o
  • Check available models: curl https://texapi.dev/v1/models -H "Authorization: Bearer tex-YOUR_KEY"

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