Codex CLI + APIPod:Build a Powerful Terminal Programming Assistant with GPT-5.3-Codex

# Install Codex CLI
npm install -g @openai/codex

# Or use Homebrew
brew install --cask codex

$ codex

╭──────────────────────────────────────────────────────────────────────────────╮
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│  ██║     ██║   ██║███████╗██║     ██║   ██║█████╗     ╚████╬╝                 │
│  ██║     ██║   ██║╚════██║██║     ██║   ██║██╔══╝      ╚██╔╝                  │
│  ╚██████╗╚██████╔╝███████║╚██████╗╚██████╔╝███████╗     ██║                   │
│   ╚═════╝ ╚═════╝ ╚══════╝ ╚═════╝ ╚═════╝ ╚══════╝     ╚═╝                   │
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╰──────────────────────────────────────────────────────────────────────────────╯

> Refactor this function to make it more readable

mkdir -p ~/.codex
cat > ~/.codex/config.toml << 'EOF'
model = "gpt-5.3-codex"
model_reasoning_effort = "high"
model_provider = "apipod"

[model_providers.apipod]
name = "APIPod"
base_url = "https://api.apipod.ai/v1"
wire_api = "responses"
requires_openai_auth = true
env_key = "OPENAI_API_KEY"
EOF

{
  "OPENAI_API_KEY": "Your APIPod API Key"
}

model_reasoning_effort = "high"
plan_mode_reasoning_effort = "xhigh"   # Exclusive to Plan mode

$ codex -c model_reasoning_effort=high

> Refactor src/utils/parser.ts to make it more readable, add type annotations and JSDoc

🔄 Analyzing file...
🔄 Refactoring...
✅ Done!

Modified src/utils/parser.ts:
  - Added complete TypeScript types
  - Added JSDoc comments for all functions
  - Extracted duplicate logic into standalone functions
  - Optimized error handling

$ codex

> Run tests and fix all failing cases

🔄 Running npm test...
❌ Found 3 failing tests

Fixing...
  ✅ test/auth.test.ts:42 - Fixed token expiration check logic
  ✅ test/api.test.ts:87 - Fixed empty response handling
  ✅ test/db.test.ts:15 - Added mock data cleanup

🔄 Rerunning tests...
✅ All tests passed!

Committed: fix: resolve 3 test failures

$ codex -c model_reasoning_effort=xhigh

> Help me design an authentication system for microservices architecture, including JWT, refresh tokens, and multi-device login

🔄 Analyzing requirements...
🔄 Designing architecture...
✅ Done!

Design Document:
  ├── Architecture Overview
  │   ├── Authentication Service (auth-service)
  │   ├── Token Service (token-service)
  │   └── Session Management (session-service)
  ├── API Design
  │   ├── POST /auth/login
  │   ├── POST /auth/refresh
  │   └── POST /auth/logout
  └── Security Considerations
      ├── JWT Signature Algorithm Selection
      ├── Refresh Token Rotation Strategy
      └── Multi-Device Concurrency Control

1# ~/.codex/config.toml
2# Complete Codex CLI Configuration Example
3
4# ========== Model Configuration ==========
5model = "gpt-5.3-codex"
6model_reasoning_effort = "xhigh"        # Reasoning depth: low/medium/high/xhigh
7model_reasoning_summary = "detailed"     # Reasoning summary: concise/detailed
8model_verbosity = "high"                 # Output verbosity: low/medium/high
9plan_mode_reasoning_effort = "xhigh"     # Reasoning tier exclusive to Plan mode
10
11# ========== Provider Configuration ==========
12model_provider = "apipod"
13
14[model_providers.apipod]
15name = "APIPod"
16base_url = "https://api.apipod.ai/v1"
17wire_api = "responses"                   # API protocol: responses (recommended)
18requires_openai_auth = true              # Use OPENAI_API_KEY environment variable
19
20# ========== Security Configuration ==========
21# Sandbox mode (select based on trust level)
22# - read-only: Read-only, most secure
23# - workspace-write: Write access to workspace directory
24# - danger-full-access: Unrestricted (only for trusted environments!)
25sandbox_mode = "read-only"
26
27# Approval policy
28# - untrusted: All commands require approval
29# - on-request: Model decides when to request approval
30# - never: Fully automatic (use with caution!)
31approval_policy = "on-request"
32
33# Network access
34network_access = "disabled"              # disabled / enabled
35
36# Privacy settings
37disable_response_storage = true          # Do not store responses (ZDR compliant)
38
39# ========== Feature Flags ==========
40[features]
41streamable_shell = true                  # Streamed shell output

# Temporarily use high reasoning tier
codex -c model_reasoning_effort=high

# Temporarily allow network access
codex -c network_access=enabled

# Combine multiple configurations
codex -c model_reasoning_effort=xhigh -c sandbox_mode=workspace-write

1import openai
2
3client = openai.OpenAI(
4    base_url="https://api.apipod.ai/v1",
5    api_key="your-api-key"
6)
7
8response = client.chat.completions.create(
9    model="gpt-5.3-codex",
10    messages=[{"role": "user", "content": "Hello!"}]
11)