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Head to head · LLM inference · October 2026 research run

Antseed vs Muse Spark Open

Antseed scores 55.1 (C) on agent readiness against Muse Spark Open's 53.4 (D), and leads in 5 of 7 scored categories. Muse Spark Open leads on schema & documentation and agent ergonomics. Both do llm inference.

Best model APIs and inference for AI agents · All 210 models comparisons

AntseedAntseed Foundation · Model router C55.1/100#715 of 1095 Muse Spark OpenMeta · Model API D53.4/100#760 of 1095

Which one, for what

Antseed C

Best for Agents and coding tools that want pay-per-request inference with no account, and owners comfortable holding USDC on Base.

Ahead on

  • Reliability, 62 against 42
  • Payments & pricing, 70 against 50
  • Maintenance & community, 79 against 60
  • Transparency & trust, 59 against 53

Also in its favour

  • Free to start without a card
  • Open source

Watch for

The buyer proxy copies a client's Authorization and x-api-key headers to the seller. The repository's March 2026 review flagged it and issue #1104 is open

Muse Spark Open D

Best for A team with a four-GPU Blackwell node, or two to four Mac Studios, that wants a 1M-token multimodal coding and agent model on its own hardware with no prompts leaving it.

Ahead on

  • Schema & documentation, 61 against 55
  • Agent ergonomics, 69 against 56

Also in its favour

  • No incidents deducted, where Antseed loses 4 points for them

Watch for

The NVFP4 checkpoint (about 537 GB) serves on four B300 GPUs and the BF16 one (about 1.65 TB) on eight

Score by category

CategoryWeight this runAntseedMuse Spark OpenEdge
Reliability16%206242Antseed +20
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.25561Muse Spark Open +6
Agent ergonomics13%16.25669Muse Spark Open +13
Security & auth14%17.54544Antseed +1
Payments & pricing10%12.57050Antseed +20
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.87960Antseed +19
Transparency & trust7%8.85953Antseed +6
Negative events≤15-40
TotalC 55.1/100D 53.4/100

Facts side by side

FactAntseedMuse Spark Open
KindModel routerModel API
VendorAntseed FoundationMeta
Hosted endpointno (local only)no (local only)
TransportsHTTPHTTP
AuthNoneNone
PricingPay per useFree
x402nono
LicenceGPL-3.0 (LICENSE in the repository). The @antseed/cli manifest on npm carries no licence fieldMuse Model Licence (source-available weights, not an OSI licence), free of charge with an attribution notice, a separate agreement with Meta before Model as a Service by a licensee group above $20M gross revenue, and the Muse Spark Open Usage Policy
Read-only variant documentednono
llms.txtyesyes
Last release2026-10-082026-10-15
Terms last updated2026-05-15
Privacy policy last updatedno document linkedno document linked
Customer content may train modelsnot found in the text
Terms restrict automated accessnot found in the text
Terms restrict benchmarkingnot found in the text
Terms or service can change without noticenot found in the text
Arbitration or class-action waivernot found in the text
Popularity106 stars, 1.8k npm/wknone

Verdicts

Antseed

A buyer needs no account. The CLI creates a wallet key, free models answer at once and paid ones draw on deposited USDC, with seller, tokens and cost returned in response headers. Sellers are unvetted and can read prompts unless TEE-verified, the proxy forwards a client's own credential headers to them, and every package is pre-1.0.

Muse Spark Open

Muse Spark Open runs on the owner's hardware in seven runtimes, with OpenAI-compatible servers in vLLM and SGLang, standard tool calls, a 1M-token context and Meta's own serving docs. Serving the 537 GB NVFP4 checkpoint takes four B300 GPUs, Meta's download is gated by manual review, and the licence adds attribution and a revenue threshold for model resellers.

Before you call either

Antseed

  1. Send a placeholder key such as antseed-p2p. The proxy forwards whatever Authorization or x-api-key header the client sends to the seller
  2. Call GET /v1/models first and request a concrete id. The antseed alias works only when the desktop app has a model selected
  3. Handle 402 insufficient_deposits by reading suggestedAmount, then fund the address from antseed buyer deposit with USDC on Base
  4. Pass --verifiers antseed-verifier --require-verifier to antseed buyer start when prompts are private, so only TEE-verified sellers are routed
  5. Read x-antseed-peer-id and x-antseed-estimated-cost-usd on each response, and pin a seller with <peerId>@<model> when the same one must answer

Muse Spark Open

  1. Start vLLM or SGLang with --reasoning-parser muse --tool-call-parser muse (vLLM also --enable-auto-tool-choice), or tool calls come back as raw text
  2. Set reasoning_effort to low or medium for short tasks. The default is xhigh, reasoning can't be turned off, and other values return an error
  3. Stop only on <|eot|> and end of text. Stopping on <|eom|> cuts off tool calls and final answers
  4. Stream long generations and leave max_tokens room for reasoning, or content can come back empty with finish_reason length
  5. Don't call Meta Model API for this model. Use a self-hosted server or a hosted provider's model string, such as meta-models/muse-spark-open

Questions

Which is better for AI agents, Antseed or Muse Spark Open?

Antseed scores 55.1 (C) on agent readiness against Muse Spark Open's 53.4 (D), and leads in 5 of 7 scored categories. Muse Spark Open leads on schema & documentation and agent ergonomics.

Do Antseed and Muse Spark Open need an API key?

Neither needs a key.

Can an agent call Antseed and Muse Spark Open without installing anything?

No hosted endpoint is listed for Antseed. No hosted endpoint is listed for Muse Spark Open.

Are Antseed and Muse Spark Open open source?

Antseed is open source (GPL-3.0 (LICENSE in the repository). The @antseed/cli manifest on npm carries no licence field). No open-source release is listed for Muse Spark Open.

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