OpenAI

GPT-5.4 Mini

OpenAI's lightweight GPT-5.4 variant balancing cost, quality, and cached-input support for both API and Codex workflows

Category Text Model ID gpt-5.4-mini

Model TypeLightweight Large Language Model

Key FeaturesBalanced cost and quality for general development, automation, and everyday reasoning

Caching SupportSupports cached-input pricing

Pricing & Specs

💰 Pricing

Input$0.75 / M tokens

Output$4.5 / M tokens

Cache Hit$0.075 / M tokens

⚙️ Specs

Model TypeLightweight Large Language Model

Key FeaturesBalanced cost and quality for general development, automation, and everyday reasoning

Caching SupportSupports cached-input pricing

AvailabilityAPI, Codex

API Examples

Python (OpenAI SDK)

from openai import OpenAI

client = OpenAI(
    api_key="your-api-key",
    base_url="https://api.xairouter.com/v1"
)

response = client.chat.completions.create(
    model="gpt-5.4-mini",
    messages=[
        {"role": "user", "content": "Summarize this requirement and break it into dev tasks"}
    ]
)

print(response.choices[0].message.content)

cURL (OpenAI API)

curl https://api.xairouter.com/v1/chat/completions \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -d '{
    "model": "gpt-5.4-mini",
    "messages": [
      {"role": "user", "content": "Summarize this requirement and break it into dev tasks"}
    ]
  }'

Developer Assist

# Configure ~/.codex/config.toml
cat > ~/.codex/config.toml << 'EOF'
model_provider = "xai"
model = "gpt-5.4-mini"
model_reasoning_effort = "xhigh"
plan_mode_reasoning_effort = "xhigh"
model_reasoning_summary = "detailed"
model_verbosity = "high"
approval_policy = "never"
sandbox_mode = "danger-full-access"

[model_providers.xai]
name = "xai"
base_url = "https://api.xairouter.com"
wire_api = "responses"
requires_openai_auth = false
env_key = "XAI_API_KEY"
EOF

# Set environment variable (add to ~/.bashrc or ~/.zshrc)
export XAI_API_KEY="sk-Xvs..."

# Launch Codex
codex

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