GPT-5.1 Chat API Pricing

GPT-5.1 Chat pricing by provider

4 listings across 2 providers. Token prices are in US dollars per 1M tokens. The highlighted row is the price quoted above.

What GPT-5.1 Chat costs in practice

1,000 requests with 2,000 input and 500 output tokens each

100 long-document requests with 100,000 input and 2,000 output tokens each

GPT-5.1 Chat features

Input: text, image. Output: text.

• Function calling
• Parallel tool calls
• Structured output
• Image input
• PDF input
• Reasoning
• Prompt caching

Use GPT-5.1 Chat with LiteLLM

Call GPT-5.1 Chat through the LiteLLM Python SDK, or put it behind the LiteLLM proxy and send OpenAI-format requests to /v1/chat/completions. LiteLLM tracks the cost of every request at these prices.

from litellm import completion

response = completion(
    model="gpt-5.1-chat-latest",
    messages=[{"role": "user", "content": "Hello!"}],
)

model_list:
  - model_name: gpt-5.1-chat
    litellm_params:
      model: gpt-5.1-chat-latest
      api_key: os.environ/OPENAI_API_KEY

curl http://0.0.0.0:4000/v1/chat/completions \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer sk-1234" \
  -d '{
    "model": "gpt-5.1-chat",
    "messages": [{"role": "user", "content": "Hello!"}]
  }'

GPT-5.1 Chat FAQ

More OpenAI models

• GPT-5.4 High$2.50 / $15 per 1M tokens
• GPT-5.4 Low$2.50 / $15 per 1M tokens
• GPT-5.6 Sol Disc$4 / $20 per 1M tokens
• GPT-5.5 Cyber$12.50 / $75 per 1M tokens
• GPT-5.6 Cyber$12.50 / $75 per 1M tokens
• GPT-5.6$4 / $20 per 1M tokens
• GPT-5.6 Luna$0.20 / $1.20 per 1M tokens
• GPT-5.6 Sol$4 / $20 per 1M tokens