MODELS / OPENAI

GPT-5.3 Chat

The model powering ChatGPT is gpt-5.3-chat-latest: this is OpenAI's best general-purpose model, part of the GPT-5 flagship model family.

TEXTFILE-INPUTIMPLICIT-CACHINGTOOL-USEVISIONWEB-SEARCH
128K
CONTEXT WINDOW
16.4K
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://enterprise.blackbox.ai/v1/chat/completions \
  -H "Authorization: Bearer $BLACKBOX_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "blackboxai/openai/gpt-5.3-chat",
    "messages": [{ "role": "user", "content": "Hello!" }],
    "stream": true
  }'
INPUT: file, image, textOUTPUT: textRELEASED: 2026-03-03
RELATED MODELS

Also worth a look.

OPENAI

GPT 5.2 Codex

400K context · $1.75 / 1M tokens input · $14 / 1M tokens output

OPENAI

GPT 4o Mini Search Preview

128K context · $0.15 / 1M tokens input · $0.6 / 1M tokens output

OPENAI

GPT 5.1 Codex Max

400K context · $1.25 / 1M tokens input · $10 / 1M tokens output