Use case
GPT-5.3 Codex streaming
streaming notes for gpt-5.3-codex: the rate card, a worked volume, and when to send this ID. A sample of 1 million input tokens plus 200 thousand output tokens is about $0.910 on corouter (input $0.350, output $0.560).
How streaming is billed
A streamed response is still billed on input and output tokens, not on how long the socket stays open. Output for gpt-5.3-codex is $2.80 per million tokens.
A sample of 1 million input tokens plus 200 thousand output tokens is about $0.910 on corouter (input $0.350, output $0.560).
A field you can set
A familiar chat-completions shape often sets "stream": true next to "model": "gpt-5.3-codex". On a messages shape, follow the stream field your client actually sends.
GPT-5.3 Codex is a coding ID with a 272K window. Its list rate matches GPT-5.2 Codex; the difference you bill is the ID itself, gpt-5.3-codex.
Questions
- Which model ID should the request send?
- Send gpt-5.3-codex. Do not put a different name in the model field.
- What is the minimum top-up?
- Prepaid credits, $5 minimum top-up, no subscription tier.