MODELS / OPENAI

GPT-4.1 (Fast)

GPT 4.1 is OpenAI's flagship model for complex tasks. It is well suited for problem solving across domains.

TEXTFILE-INPUTIMPLICIT-CACHINGTOOL-USEVISIONWEB-SEARCHFAST
1.0M
CONTEXT WINDOW
32.8K
MAX OUTPUT TOKENS
$3.50
INPUT PRICE / 1M TOKENS
$14
OUTPUT PRICE / 1M TOKENS
QUICKSTART

Call it in one request.

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

curl https://enterprise.blackbox.ai/v1/chat/completions \
  -H "Authorization: Bearer $BLACKBOX_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "blackboxai/openai/gpt-4.1-fast",
    "messages": [{ "role": "user", "content": "Hello!" }],
    "stream": true
  }'
SPECIFICATIONS

The full spec sheet.

Context, pricing, modalities, routing, and deployment: everything GPT-4.1 (Fast) supports, in one table.

MODEL ID
blackboxai/openai/gpt-4.1-fast
DEVELOPED BY
OpenAI
MODEL TYPE
Text
RELEASED
Apr 14, 2025
CONTEXT WINDOW
1.0M
MAX OUTPUT TOKENS
32.8K
INPUT MODALITIES
text, image, pdf
OUTPUT MODALITIES
text
INPUT PRICE
$3.50 / 1M tokens
OUTPUT PRICE
$14 / 1M tokens
CACHE READ
$0.875 / 1M tokens
REASONING
Not supported
DATA RETENTION
Standard retention
DEDICATED DEPLOYMENT
Not available (closed-weight model)
SUPPORTED PARAMETERS
max_tokenstemperaturestoptoolstool_choice