THE MODEL, IN DETAIL / Meta AI

Muse Spark 1.2 (xhigh)

meta/muse-spark-1.2ProprietaryReasoningxhigh configuration

Muse Spark 1.2 is a reasoning model from Meta, designed for complex agentic tasks. It accepts text, images, video, and PDF documents, returns text, and offers a 1M-token context window....

OpenRouter

Source-linked model intelligenceCatalog added 5 Aug 2026Specifications observed 28 Oct 2026

Specifications and providers describe Meta: Muse Spark 1.2. Evaluation scores retain the exact xhigh configuration.

SimpleQA Verified

60.3%

Source-reported

Context window

943.7K max output tokens

Input price

$1.25

USD / million input tokens

Output price

$4.25

USD / million output tokens

Inference providers

1 provider routes observed

Measured output speed

—

No model-level measurement

01 / PERFORMANCE

A clearer view of capability.

Read the score, understand the context, and explore where this model sits among its peers.

Performance fingerprint

Individual published accuracy scores · not a composite index

At least three published accuracy scores are needed for this view.

Performance meets price

SimpleQA Verified · same published source and version

Google DeepMindOpenAIMeta AIAnthropicxAIAlibaba

In good company

SimpleQA Verified · Epoch AI · benchmark data

Google DeepMind

75.6

OpenAI

73.9

OpenAI

69.2

Google DeepMind

66.8

Google DeepMind

66.2

Google DeepMind

66.2

Google DeepMind

OpenAI

60.7

OpenAI

60.3

This model

Rank #14 in this published cohort. 93 models in the source cohort. Showing selected nearby models. Evaluation settings can differ.

Evidence, by task.

Coverage is not a capability score.

1published results
1 evaluation source

Reasoning1 evaluation

CodingAwaiting evidence

MathematicsAwaiting evidence

VisionAwaiting evidence

AgenticAwaiting evidence

Long contextAwaiting evidence

Documented features, task evaluations, and preference rankings describe different things. Missing coverage does not imply a model cannot perform a task.

Explore our methodology

02 / BENCHMARK EXPLORER

The numbers behind the model.

Original results, exact versions, and a direct path to the evidence behind every score.

1 published results

1 percentage-based evaluations. Each benchmark measures a different task; compare results within the same evaluation and protocol.

Published benchmark results for Muse Spark 1.2 (xhigh)
Benchmark	Score	Version & metric	Source	Published	Evidence
		Epoch AI · independent runsAccuracy · Higher is better	Epoch AI · benchmark dataSource-reported	Not available

03 / COST & VALUE

Know what your workload costs.

Explore token prices, see where the spend goes, and model a workload of your own.

Input$1.25per million tokens

Output$4.25per million tokens

Cache read$0.15per million tokens

Cache write—per million tokens

Additional published rates

Additional rates supplied by the model catalog
Billing field	Published rate	Billing basis
Web Search	$0.0025	Source-supplied USD rate; see provider billing terms

Workload cost calculator

Change the numbers. See the trade-offs.

Pricing source

Input tokens / requestOutput tokens / requestRequests

Cached share of input0%

Token estimate only. Excludes cache writes, tools, and other provider fees. Actual token usage and provider limits vary.

Your estimated spend

1,000 requests · 11M tokens

Uncached input$12.5

Cached input$0

Output$4.25

Per request$0.0168

Without cache discount$16.75

Estimated cache savings$0

04 / INFERENCE NETWORK

One model. Different ways to run it.

Compare inference routes by price, context, quantization, and reported availability.

1 providers · 1 routes

Standard service tier only

Provider routes for Muse Spark 1.2 (xhigh), observed 28 Oct 2026
Provider / route	Input / M	Output / M	Cache / M	Context	Output limit	Speed	Latency	Availability · 1d	Rates
MMetaQuantization not disclosed	$1.25	$4.25	$0.15	1M	943.7K	—	—	100%

Snapshot observed 28 Oct 2026. Speed and latency are the reported 30-minute median when available. This is a dated snapshot, not live monitoring.

Provider price comparison

USD per million tokens · input and output rates

InputOutput

Meta

$1.25

$4.25

Reported availability

Provider availability over the selected observation window

Meta100%

Output speed

Reported 30-minute p50 · tokens per second

No provider throughput measurements were returned in this snapshot.

Response latency

Reported 30-minute p50 · seconds

No provider latency measurements were returned in this snapshot.

Context by provider

Actual route limits can differ from the catalog maximum

Meta1M

05 / CAPABILITIES & MODALITIES

What goes in. What comes out.

A map of documented interfaces and API features, separate from benchmark performance.

INPUT MODALITIES

TextImageVideoFile

Muse Spark 1.2 (xhigh)Reasoning supported

OUTPUT MODALITIES

Text

Feature support

Listed catalog API parameters and documented pricing features

ReasoningSupported

Tool callingSupported

Tool choiceSupported

Structured outputsSupported

Response formatSupported

Reasoning detailsSupported

Seed controlNot listed

Stop sequencesNot listed

Prompt cachingSupported

TemperatureSupported

Room to work

Context capacity and completion limits

1Mtotal context tokens

Context window

943.7Kmax output

Output tokens share the total context budget. The maximum completion length is a separate limit, and individual provider routes may have smaller limits.

Catalog context: 1,048,576 tokens
Maximum output: 943,718 tokens
Top-provider context: 1,048,576 tokens

Features vary by route

Check the provider before depending on a specific API feature.

API feature support by provider
Provider route	Reasoning	Tools	Structured output	Response format	Implicit caching
Meta	Supported	Supported	Supported	Supported	Supported

06 / UNDER THE HOOD

The complete specification sheet.

Exact identities, model architecture, limits, and the defaults that shape a request.

Identity & architecture

Developer: Meta AI
Exact identity: muse-spark-1.2_xhigh
Subject: Model Configuration
Access: proprietary
License: Not disclosed
Parameters: Not disclosed
Tokenizer: Other
Instruction format: Not disclosed

Reasoning & controls

Reasoning: Supported
Mandatory reasoning: Yes
Reasoning by default: Not documented
Published configuration: xhigh
Supported reasoning efforts: xhigh, high, medium, low, minimal
Default reasoning effort: medium
API parameters: 12
Provider moderation: Yes
Quantization variants: Not disclosed

Dates & limits

Catalog added: 5 Aug 2026
Knowledge cutoff: Not disclosed
Catalog expiration: Not documented
Specifications observed: 28 Oct 2026
Providers observed: 28 Oct 2026
Request limits: Provider-specific / not supplied
Canonical catalog ID: meta/muse-spark-1.2-20260805

API parameters & defaults

Availability is catalog-wide. Defaults can vary across providers.

include_reasoningSupported · default not supplied

max_tokensSupported · default not supplied

reasoningSupported · default not supplied

reasoning_effortSupported · default not supplied

repetition_penaltySupported · default not supplied

response_formatSupported · default not supplied

structured_outputsSupported · default not supplied

temperatureSupported · default not supplied

tool_choiceSupported · default not supplied

toolsSupported · default not supplied

top_kSupported · default not supplied

top_pSupported · default not supplied

07 / BUILD WITH THIS MODEL

From exploration to your first request.

Use the documented catalog identifier and keep your API key in an environment variable.

Make an API request

const response = await fetch(
  "https://openrouter.ai/api/v1/chat/completions",
  {
    method: "POST",
    headers: {
      Authorization: `Bearer ${process.env.OPENROUTER_API_KEY}`,
      "Content-Type": "application/json",
    },
    body: JSON.stringify({
      "model": "meta/muse-spark-1.2",
      "messages": [
        {
          "role": "user",
          "content": "Explain the trade-offs in this design."
        }
      ],
      "reasoning": {
        "effort": "xhigh"
      }
    }),
  },
);
if (!response.ok) throw new Error(`HTTP ${response.status}`);
const data = await response.json();
console.log(data.choices[0].message.content);

08 / PROVENANCE & HISTORY

Every number has a story.

Follow the source, check the observation date, and distinguish published results from model specifications.

The source register

Direct links to the underlying records

OpenRouter model catalog

Architecture, modalities, parameters, and starting prices

Observed 28 Oct 2026

OpenRouter provider routes

Provider limits, prices, availability, and reported measurements

Observed 28 Oct 2026

Epoch AI · benchmark data

Source-reported · Epoch AI · independent runs

Observed 28 Oct 2026

The observation trail

Recorded events, in chronological order

5 Aug 2026Added to the model catalog

Catalog creation date, as recorded by OpenRouter.

28 Oct 2026Provider routes observed

1 inference routes in this snapshot.

28 Oct 2026Model specifications observed

Catalog pricing, limits, and supported parameters captured.

Observation dates describe when data was captured. They do not represent newly run evaluations or continuous performance monitoring.

Published observation ledger

Historical evidence, with source and version preserved.

Published observation history for Muse Spark 1.2 (xhigh)
Observed	Benchmark	Version	Source	Verification
28 Oct 2026	SimpleQA Verified	Epoch AI · independent runs	Epoch AI · benchmark data	Source-reported
28 Oct 2026	SimpleQA Verified	Epoch AI · independent runs	Epoch AI · benchmark data	Source-reported
28 Oct 2026	SimpleQA Verified	Epoch AI · independent runs	Epoch AI · benchmark data	Source-reported

09 / A FEW MORE DETAILS

Questions worth asking.

Quick answers, drawn from this model’s connected specifications.

How much does Muse Spark 1.2 (xhigh) cost?

Catalog starting rates are $1.25 per million input tokens and $4.25 per million output tokens. Cache-read pricing is $0.15 per million tokens. Compare provider routes and service tiers above for their specific prices.

How much context can it handle?

1,048,576 tokens in the catalog context window. The catalog lists a maximum of 943,718 completion tokens. Provider limits can differ.

Does it support tools and structured output?

Tool calling: listed as supported. Structured outputs: listed as supported. See the provider feature matrix for route-specific differences.

How should I interpret these benchmark results?

Read the benchmark name, exact version, metric, source, and model configuration together. Different evaluation settings can change the result. Preference ratings and source-defined composite indices remain separate from task accuracy.

Are these prices and provider measurements live?

This page uses dated source snapshots. Catalog data was observed on 28 Oct 2026. Provider routes were observed on 28 Oct 2026. Missing measurements are not estimated or treated as zero.

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About Methodology Benchmark dashboard

SimpleQA Verified

Context window

Input price

Output price

Inference providers

Measured output speed

A clearer view of capability.

The numbers behind the model.

Know what your workload costs.

One model. Different ways to run it.

What goes in. What comes out.

The complete specification sheet.

From exploration to your first request.

Every number has a story.

Questions worth asking.

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