Fireworks expands Serverless Training with Muse Spark Open and DeepSeek V4.1 Flash
By Rob Litterst, Co-founder, PricingSaaS
Published Last updated
Fireworks’ pricing page · Change detected
What changed
Fireworks' Serverless Training API table gained two new base models. Muse Spark Open, with a 256K context window, is priced at $6.19 per 1M prefill tokens, $15.48 for sample tokens, and $18.58 for training tokens. DeepSeek V4.1 Flash, also 256K context, comes in cheaper at $0.60 prefill, $3.60 sample, and $4.98 train. Both sit above GLM 5.3 Flash in the same table.
Why it matters
Teams fine-tuning on Fireworks now have DeepSeek V4.1 Flash as a materially cheaper training option alongside pricier models like Muse Spark Open, within the same transparent table unlike its serverless inference prices, which moved to the docs in May. Watch whether Fireworks keeps Serverless Training fully priced in public as it keeps adding models, or eventually treats it the way it treated inference pricing in May.
In context
This is Fireworks' latest addition to Serverless Training, coming 19 days after it added GLM 5.3 Flash with 200K context to the same per-token training table. Fireworks has made 7 real pricing changes in the last 90 days, faster than its roughly 34-day average gap between moves. The contrast with May's move of serverless inference prices off the pricing page and into the docs is notable: Training pricing stays fully listed even as the catalog grows. Market-wide, 201 pricing changes across 153 companies have touched credits-and-usage billing in the last 180 days, 11.6% of everything tracked.