MODELS / META

Muse Spark Open

Muse Spark Open is Meta’s open-weight reasoning model for coding and agentic workflows. Its sparse mixture-of-experts architecture has 816 billion total parameters with approximately 42 billion active per token, combining code generation, tool use, and image understanding. A…

TEXTREASONINGAUDIO-INPUTIMPLICIT-CACHINGREASONINGSTRUCTURED-OUTPUTTOOL-USEVIDEO-INPUTVISION
1.0M
CONTEXT WINDOW
-
MAX OUTPUT TOKENS
$1.25
INPUT PRICE / 1M TOKENS
$4.25
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/meta/muse-spark-open",
    "messages": [{ "role": "user", "content": "Hello!" }],
    "stream": true
  }'
SPECIFICATIONS

The full spec sheet.

Context, pricing, modalities, routing, and deployment: everything Muse Spark Open supports, in one table.

MODEL ID
blackboxai/meta/muse-spark-open
DEVELOPED BY
Meta
MODEL TYPE
Text
RELEASED
Oct 15, 2026
CONTEXT WINDOW
1.0M
MAX OUTPUT TOKENS
-
INPUT MODALITIES
text, audio, image, video
OUTPUT MODALITIES
text
INPUT PRICE
$1.25 / 1M tokens
OUTPUT PRICE
$4.25 / 1M tokens
CACHE READ
$0.15 / 1M tokens
REASONING
Supported
DATA RETENTION
Standard retention
DEDICATED DEPLOYMENT
Not available (closed-weight model)
SUPPORTED PARAMETERS
max_tokenstemperaturestoptoolstool_choicereasoninginclude_reasoningresponse_formatstructured_outputs