MODELS / OPENAI

GPT 5.1 Thinking

An upgraded version of GPT-5 that adapts thinking time more precisely to the question to spend more time on complex questions and respond more quickly to simpler tasks.

TEXTREASONINGFILE-INPUTIMPLICIT-CACHINGREASONINGTOOL-USEVISIONWEB-SEARCH
400K
CONTEXT WINDOW
128K
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-thinking",
    "messages": [{ "role": "user", "content": "Hello!" }],
    "stream": true
  }'
INPUT: image, textOUTPUT: textRELEASED: 2025-11-12
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