Meta's free Muse Spark Open license forces API sellers over $20 million in revenue to sign; Nebius sells it

On October 15, Alexandr Wang's Meta▼−2.28% — Meta, down 2.28 percent today Superintelligence Labs published the weights of Muse Spark Open, an 816-billion-parameter model that any developer with a disk can download. The same day, the model appeared on seven API platforms: BasetenPVT~$1.4B — Baseten, private, latest valuation ~$1.4B, Fireworks AIPVT~$1.1B — Fireworks AI, private, latest valuation ~$1.1B, GroqPVT$3.5B — Groq, private, latest valuation $3.5B, Modal, Nebius▼−0.47% — Nebius, down 0.47 percent today, OpenRouter and Together AIPVT~$3.3B — Together AI, private, latest valuation ~$3.3B ¹². What looked like a gift carried a hook buried in the paperwork, and the hook points at the listed company in the lineup.

The gift has terms attached

Meta's blog↗ calls the Muse Model License one that "allow[s] many developers to use the model for free" ¹. VentureBeat, which read the actual license text, reports the clause↗: when a licensee and its affiliates book more than $20 million in aggregate gross revenue over any 12 months, it must notify Meta and sign a separate written agreement before serving Spark Open or its derivatives as a model-as-a-service business. The trigger is the seller's total revenue, not the revenue from Spark Open tokens. Internal deployment, research and embedding the model in your own product are exempt ⁴. The free tier is real; it simply excludes exactly the businesses Meta signed up as launch partners.

The open-flag flips who pays

Here sits the complication. DeepSeek, Black Forest LabsPVT~$4B — Black Forest Labs, private, latest valuation ~$4B and PerplexityPVT$20B — Perplexity, private, latest valuation $20B all shipped giveaways this month that left the price with the platform. Muse Spark Open inverts it: the downloaders pay nothing, the rent claim sits with Meta against whoever sells tokens at scale. Nebius (NBIS), the only named partner whose shares trade, is pitching Token Factory as its next inference business, with production inference workloads more than tripling in Q2 2026 and an 18.3% pay-as-you-go price increase from October 1 reported↗ but not formally confirmed by the company ⁵. None of Nebius's Token Factory disclosures has mentioned a license obligation to a direct competitor ⁵⁴. That silence is the disclosure gap investors should price.

The model is good, not dominant

The receipts behind the hype check out with footnotes. Muse Spark Open scored 1511 on Arena's Code Arena: WebDev board↗, the top US open model, though the qualifier is doing work: on Meta's own table it trails Kimi K3 and GLM 5.3 on terminal coding and software engineering, and its Intelligence Index score of 39 sits below Xiaomi's▲+1.50% — Xiaomi, up 1.50 percent today MiMo-V2.6-Pro at 46 ³⁴. It did land a genuine first: it runs on two paired M5 Ultra Mac Studios, about a terabyte of unified memory on a desk ¹³.

What to watch

The counterpoint: $20 million is a low bar for an API platform but the clause has no published fee schedule. Meta may negotiate nothing, or may charge at market terms like any licensor; the record does not say. Watch three dated tells: Nebius's Q3 call, where management should face the license question for the first time; the missing public price list if any named partner crosses the threshold; and Together AI's own pricing, which already lists Spark Open at the same rates Meta charges for hosted Spark, $1.25 in and $4.25 out per million tokens ⁴. Meta built the open-weight goodwill and kept a claim on the tollbooth. Someone had to pay for the roads.