GPT-5.3 Chat

openai/gpt-5.3-chat

GPT-5.3 Chat is an update to ChatGPT's most-used model that makes everyday conversations smoother, more useful, and more directly helpful. It delivers more accurate answers with better contextualization and significantly...

Input

$2.275 / 1M tokens

Output

$18.2 / 1M tokens

Context

128K tokens

Capabilities

✓ Streaming✓ Tool / function calling✓ JSON / structured output✓ Vision (image input)

Call this model

Pass openai/gpt-5.3-chat as the model. Change only the base URL from your existing OpenAI SDK setup.

quickstart.sh

curl https://modeldatabase.com/v1/chat/completions \
  -H "Authorization: Bearer $MDB_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "openai/gpt-5.3-chat",
    "messages": [{"role":"user","content":"Hello!"}]
  }'

Prices are final — the routing margin is already included. See the full pricing table or the API docs.