MODELS / OPENAI

GPT-5.1 Instant

GPT-5.1 Instant (or GPT-5.1 chat) is a warmer and more conversational version of GPT-5-chat, with improved instruction following and adaptive reasoning for deciding when to think before responding.

TEXTFILE-INPUTIMPLICIT-CACHINGTOOL-USEVISIONWEB-SEARCH
128K
CONTEXT WINDOW
16.4K
MAX OUTPUT TOKENS
$1.25 / 1M tokens
INPUT PRICE
$10 / 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-5.1-instant",
    "messages": [{ "role": "user", "content": "Hello!" }],
    "stream": true
  }'
INPUT: image, textOUTPUT: textRELEASED: 2025-11-12
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