Is Muse Spark 1.2 Contributor available on FastMetal?

Not at the moment. Muse Spark 1.3, from the same lab, is available on the FastMetal API today.

What is the context window of Muse Spark 1.2 Contributor?

1,048,576 tokens, shared between the prompt and the response.

Muse Spark 1.2 Contributor

Muse Spark 1.2 contributor tier is a reasoning model from Meta designed for developers who want to start building at an even lower cost. It’s meaningfully cheaper than Muse Spark...

8/21/2026

1,048,576 tokens

Specifications

Modalities

Input

text

image

video

file

audio

Output

text

Supported Parameters

include_reasoning

max_tokens

reasoning

reasoning_effort

repetition_penalty

response_format

structured_outputs

temperature

tool_choice

tools

top_k

top_p

Max Output Tokens

943,718

Reasoning Configuration

Default: Thinking on (effort: medium)
Selectable effort levels: xhigh
high
medium
low
minimal
Turning thinking off: Not possible (always thinks)

How to control thinking, and what it costs

Data policy

Prompt retention: Unknown — we could not confirm
Training: Unknown — not declared

"Unknown" does not mean "safe". It means we could not confirm it.

Whether a provider trains on prompts is a declared value from our terms with them. Retention is determined from the upstream listing for every host this model can reach. Neither is guessed.

Frequently asked questions

Is Muse Spark 1.2 Contributor available on FastMetal?: Not at the moment. Muse Spark 1.3, from the same lab, is available on the FastMetal API today.
What is the context window of Muse Spark 1.2 Contributor?: 1,048,576 tokens, shared between the prompt and the response.

Models you can use on FastMetal

Muse Spark 1.3 Contributor