OpenAI: GPT-5.3-Codex

openai/gpt-5.3-codex — available through the Autonomous Relay Agents API, served by OpenAI.

OpenAI: GPT-5.3-Codex has a 400,000-token context window and costs $1.75 per million input tokens and $14.00 per million output tokens, at the provider's list price on your own key.

Context length
400,000 tokens
Input
$1.75 per M
Output
$14.00 per M
Served by
openai
Input modalities
text, image, file

This is a BYOK-only model: requests use your own provider key. Prices shown are the provider's list prices.

Call it

Any OpenAI-compatible client works: change the base URL and send this model id.

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

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