gpt-5.3-codex

Name: gpt-5.3-codex
Brand: openai
SKU: openai/gpt-5.3-codex
Price: 1.925 USD
Availability: InStock

openai/gpt-5.3-codex

$1.925 in · $15.40 out per 1M tokens400k context

about 0.9¢ a message

A typical message: about 500 tokens you send and 500 it writes.

Chat with gpt-5.3-codex

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Spec sheet

Published facts from the catalog, billed prices and what we measured here. Anything not measured says so.

Price, billed here

Input, per 1M tokens: $1.925provider $1.75
Output, per 1M tokens: $15.40provider $14.00
Cached input, per 1M: $0.1925provider $0.175
Margin: +10%

Context and formats

Context window: 400,000 tokens
Longest answer: not published
Reads: text and images
Makes: text

Measured here, last 7 days

First token, median: not measured
Answered without error: not measured

Tools and JSON

Tool calling: not declared
JSON output: not declared

Price and latency history as JSON: GET /api/planet/history?id=openai/gpt-5.3-codex.

Try it here

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The answer appears here.

Measured here

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Call it

Use one OpenAI compatible endpoint, this model's id and an am_live_ key from the dashboard. You can also try it in chat first with no key.

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

Everything else is in the docs.

Embed this

A badge showing this model's live price per million tokens, as billed here, for a README or a site. It links back to this page.

<a href="https://useantimatter.com/planet/openai/gpt-5.3-codex"><img src="https://useantimatter.com/api/badge/price?id=openai%2Fgpt-5.3-codex" alt="gpt-5.3-codex price on Antimatter" height="28"></a>

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