Muse Spark

AI Agent

Muse Spark is Meta's proprietary multimodal reasoning model for agentic and coding work, served on Meta Model API and in Muse Code, with a 1M-token context window and OpenAI/Anthropic SDK-compatible endpoints.

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Features & details

Full overview from our catalog (read-only reference).

Category (short)

AI Agent

Sponsored note

Target audience

Developers & engineers

Best for

Builders who want Meta's proprietary agentic/coding model with clear per-token pricing and Muse Code as a first-party harness. Not ideal for: teams that need open weights (use Muse Glimmer / Llama lines instead), or buyers who refuse any cloud API and Meta account.

Pricing notes

Verified September 2026 at https://dev.meta.ai/docs/pricing-rate-limits.md and https://dev.meta.ai/docs/models.md. Standard tier (muse-spark-1.3, 1.2, 1.1): $1.25 / 1M input, $4.25 / 1M output, $0.15 / 1M cached input; prompts not used for training. Contributor tier (muse-spark-1.3-contributor, 1.2-contributor): $0.10 / 1M input, $0.20 / 1M output, $0.002 / 1M cached input; Meta may train on prompts and completions. Web search grounding: $2.50 per 1,000 search queries plus tokens. Rate limits (per team): Standard 3,000 RPM / 4M TPM; Contributor 100 RPM / 3M TPM. Muse Spark 1.3 max reasoning was described as limited preview at the Sep 2, 2026 launch post; confirm live model ids in the API catalog. Distinct from Muse Image ($0.01/image), Muse Voice Transcribe ($0.18/hour audio), and open-weight Muse Glimmer.

Pros & cons

Editorial notes to help compare fit before opening the vendor site.

Pros

Clear Standard vs Contributor pricing on official docs
1M context with agent-oriented API primitives
First-party Muse Code harness plus SDK-compatible API
1.3 checkpoint focused on long-horizon agents and coding efficiency

Cons

Proprietary cloud model (no Spark open weights)
Contributor tier trades privacy for cheaper tokens
Audio understanding on 1.3 is limited per Meta docs
max reasoning access may still be gated for some accounts

Review notes

Context from the listing review and editorial research.

UPDATED October 2026. Product name for the directory is Muse Spark (model family). Current recommended API id: muse-spark-1.3. DISAMBIGUATION: not Llama open weights; not Meta Muse (consumer personal agent on ai.meta.com/muse / muse.ai), which is powered by Muse Spark. Muse Code is the first-party coding harness.

Extended features

In-depth description and capability notes.

Latest checkpoint Muse Spark 1.3 (muse-spark-1.3) recommended for new work; 1.2 and 1.1 still listed 1,048,576-token context window Multimodal input: text, image, video, PDF (audio understanding limited on 1.3; prefer 1.2 or Muse Voice Transcribe for speech) Agent primitives: parallel tool calls, streamed tool-call arguments, reasoning across turns Muse Code coding-agent harness plus Meta Model API (Responses, Chat Completions, Messages) OpenAI SDK, Anthropic SDK, and agent CLI drop-in base URL https://api.meta.ai/v1 Standard vs Contributor pricing tiers (Contributor allows Meta to train on your traffic) Optional web search grounding tool (separate query fee)

Use cases

Developers and teams run long-horizon coding agents, multi-step tool loops, and multimodal reasoning through Muse Code or any OpenAI-compatible client pointed at Meta Model API.