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Model Comparison

Mercury 2 vs Muse Spark 1.3Which Is Better in 2026?

Inception•Meta: Muse Spark 1.3 logoMeta

Mercury 2 vs Muse Spark 1.3: which should you choose in 2026?

Mercury 2 (by Inception) and Muse Spark 1.3 (by Meta) are compared below. Here is how they stack up on benchmarks, price, and capabilities, and which one to pick in 2026.

There are not enough shared, protocol-compatible benchmark results to declare a performance leader.

Mercury 2 is about 5.3× cheaper on a blended 3:1 input/output basis ($0.375 vs $2.00 per 1M tokens).

Muse Spark 1.3 has the larger context window (1,048,576 tokens vs 128,000 tokens).

Choose Mercury 2 if…

  • • lower blended API cost matters for your workload

Choose Muse Spark 1.3 if…

  • • you work with longer documents, transcripts, or codebases
  • • you need image inputs

The benchmark count includes only results measured with a matching benchmark version and protocol. Arena scores are shown separately. Missing, preliminary, and incompatible data is not treated as a controlled win. Published point-score comparisons are labeled separately when protocol details are incomplete. For text-output models, the verdict also compares token pricing and context windows.

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Performance benchmarks

Every value links to its source. A dash means that no reviewed result is available for that exact model and protocol.

Mercury 2 and Muse Spark 1.3 benchmark results
BenchmarkMercury 2Muse Spark 1.3
AutomationBench-AA

A 657-task benchmark of multi-step work across simulated SaaS applications in six business domains. The Artificial Analysis protocol reports a guardrail-aware score and is distinct from both the public Zapier split and the unrelated dynamic AutoBench framework.

Guardrail-aware score

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BrowseComp

A benchmark of difficult, verifiable information-seeking questions designed to measure an agent's ability to locate hard-to-find facts through web browsing.

Accuracy

——
OSWorld-Verified

A verified computer-use benchmark in which multimodal agents operate desktop applications and are graded from the resulting environment state.

Mean task reward

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SWE-Bench Verified

A human-validated subset of real GitHub issues used to measure whether a coding agent can produce repository patches that resolve the associated tests.

Resolved

——
Terminal-Bench 2.1

Version 2.1 of the benchmark for completing realistic tasks in terminal environments. Harness, resource limits, and attempt count are part of the protocol.

Mean task success

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AutoBench

A dynamic LLM evaluation framework in which models generate questions, answer them, and participate in reciprocal peer assessment. AutoBench is distinct from Zapier's AutomationBench.

Weighted peer-assessment score

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GPQA Diamond

The highest-quality subset of Graduate-Level Google-Proof Q&A, designed to test expert-level scientific reasoning in biology, physics, and chemistry.

Accuracy

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Humanity's Last Exam

A 2,500-question expert-level benchmark spanning dozens of academic fields. Tool-assisted and no-tools results are separate protocols and must not be merged.

Accuracy

——
Arena preference scores
Arena (Text)

Human preference score

1347 ±11
—
Arena (Code/WebDev)

Human preference score for code and web development

1166 ±25
—

Benchmark sources

Reviewed evidence last updated 2026-08-09. Arena data last refreshed Sep 4, 2026.

Pricing, capabilities, and model facts

Mercury 2 and Muse Spark 1.3 model facts
FeatureMercury 2Muse Spark 1.3
Context & model facts
DeveloperInceptionMeta
API providerInceptionMeta
Input context128,000 tokens1,048,576 tokens
Maximum output50,000 tokens943,718 tokens
Released——
Added to WritingmateMar 4, 2026Sep 2, 2026
LicenseNot availableNot available
Knowledge cutoff——
Capabilities
InputsTextText, Image, Video, File, Audio
OutputsTextText
Provider endpoint accepts tool parametersYesYes
ReasoningYesYes
VisionNoYes
Image GenerationNoNo
Video GenerationNoNo
API pricing
Input (per 1M tokens)$0.25$1.25
Output (per 1M tokens)$0.75$4.25
Blended 3:1 input/output$0.375$2.00
API performance
p95 latencyNot measuredNot measured
Output throughputNot measuredNot measured
Writingmate shows API performance only when both models have enough observations from the same measurement window, prompt profile, and provider. Third-party latency values are not copied into this table.

Data sources

  • Writingmate model catalog (pricing, limits, and availability)

Catalog data last updated Sep 2, 2026.

Why Pay for Multiple Subscriptions?

Comparing Mercury 2 from Inception with Muse Spark 1.3 from Meta? Instead of managing separate API keys and subscriptions, get both with Writingmate.

Subscription-plan access for Mercury 2 and Muse Spark 1.3
PlanPriceMercury 2Muse Spark 1.3AI ImagesAI Video
Writingmate Pro
Most popular
$20/moIncludedIncludedNano Banana Pro, FLUX.2, DALL-E & moreSora 2, VEO 3.1
Writingmate Ultimate
Power users
$60/moIncludedIncludedNano Banana Pro, FLUX.2, DALL-E & moreSora 2, VEO 3.1
View Plans & Pricing

Mercury 2 vs Muse Spark 1.3 FAQ

Which is better, Mercury 2 or Muse Spark 1.3?

There are not enough shared, protocol-compatible benchmark results to declare a performance leader. Mercury 2 is about 5.3× cheaper on a blended 3:1 input/output basis ($0.375 vs $2.00 per 1M tokens). Muse Spark 1.3 has the larger context window (1,048,576 tokens vs 128,000 tokens).

Which model is cheaper to use through an API?

Mercury 2 is about 5.3× cheaper on a blended 3:1 input/output basis ($0.375 vs $2.00 per 1M tokens).

Which model supports more context?

Muse Spark 1.3 has the larger context window (1,048,576 tokens vs 128,000 tokens).

Can I switch between Mercury 2 and Muse Spark 1.3?

Yes. Use the model selector on this page to open any current Writingmate model comparison. You can also run the same prompt with both models in Writingmate.