MODELS / OPENAI

GPT-5.3 Codex

GPT-5.3-Codex advances both the frontier coding performance of GPT-5.2-Codex and the reasoning and problem-solving capabilities of GPT-5.

TEXTREASONINGZERO DATA RETENTION
400K
CONTEXT WINDOW
128K
MAX OUTPUT TOKENS
$1.75 / 1M tokens
INPUT PRICE
$14 / 1M tokens
OUTPUT PRICE
QUICKSTART

Call it in one request.

OpenAI-compatible — change the base URL, and the setup is complete.

SHELL
curl https://api.blackbox.ai/v1/chat/completions \
  -H "Authorization: Bearer $BLACKBOX_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "blackboxai/openai/gpt-5.3-codex",
    "messages": [{ "role": "user", "content": "Hello!" }],
    "stream": true
  }'
INPUT: text, image, fileOUTPUT: textRELEASED: 2026-02-24REGIONS: US, EU, APAC
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