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Fireworks AI · First-party API · LLM

accounts/fireworks/models/muse-spark-open-nvfp4

API availabilityAvailable in the API since Oct 15, 2026

Fireworks AI made accounts/fireworks/models/muse-spark-open-nvfp4 available in the API on Oct 15, 2026. Source: docs.fireworks.ai · Last checked Oct 23, 2026

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API availability

Available in the API since Oct 15, 2026

Fireworks AI announced API availability for this model on 2026-10-15. Serverless Training

This date applies to API availability. Rollouts in consumer products or other hosting routes can happen on different dates.

Hosting route
First-party API
Affected scope
Serverless Training
Announced
Oct 15, 2026
First seen by ModelClock
Oct 22, 2026

What the provider published

docs.fireworks.ai ↗

​ New Serverless Training model: Muse Spark Open

Muse Spark Open is now available for LoRA workloads on the shared Serverless Training pool, with up to 262K context. Use accounts/fireworks/models/muse-spark-open-nvfp4 as the base model. See the Serverless Training guide for setup and the training model catalog for current availability.

Read from the provider's text; the quote is the provider's exact lines.

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