Requests with n greater than 1 return HTTP 400; request one completion at a time. Source ↗
Chat Completions cannot carry reasoning · Meta / Chat Completions›
For external keys, Chat Completions redacts reasoning_content to empty and cannot carry reasoning across turns; use Responses when continuity matters. Source ↗
FAQ
How much does Muse Spark 1.1 cost?›
$1.25 per 1M input tokens and $4.25 per 1M output tokens; cached input $0.15 per 1M. A typical benchmark task costs about $1.38 at xhigh effort.
Is Muse Spark 1.1 free to use?›
There is no free API; the cheapest paid price is $1.25 per 1M input tokens.
How good is Muse Spark 1.1, and what is it best at?›
#21 of 334 in Chat & Knowledge, #43 of 132 in Coding, #43 of 133 in Agents & Tool Use, #33 of 195 in Writing & Language, #20 of 37 in Vision & Documents. Strongest at: Reasoning, Science, Knowledge.
Is Muse Spark 1.1 better than Muse Spark?›
On Arena Text · Russian, Muse Spark 1.1 scores 1,481.8 vs 1,467.2 — about the same.
How can I use Muse Spark 1.1?›
Through the API of Meta.
What is the context window of Muse Spark 1.1?›
1M tokens, with up to 944K output tokens.
When was Muse Spark 1.1 released? Is there a newer version?›
Released 2026-07-09. It has been superseded by Muse Spark 1.2.
Is Muse Spark 1.1 open source?›
No, Muse Spark 1.1 is a closed model available through an API. The closest open-weights option here is Kimi K3.
Can Muse Spark 1.1 read images?›
It accepts text and images, PDF files, video as input.
What is Muse Spark 1.1?›
Muse Spark 1.1 is a closed language model from Meta, released Jul 2026, the successor to Muse Spark.
What are the best alternatives to Muse Spark 1.1?›
Gemini 3.8 Flash (cheaper), Kimi K3 (open weights).