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Head-to-head comparison

GPT-5.4 mini vs. Muse Spark 1.3

Compare published benchmark results from matching versions and cohorts, API pricing, and technical specifications. Any documented test setup differences remain visible.

shared result series
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distinct benchmarks
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latest retrieval
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Specifications

General specifications

Release date, availability, context window, architecture, and published parameter counts at a glance. Undisclosed details remain marked as unavailable.

Specifications for GPT-5.4 mini and Muse Spark 1.3
AttributeGPT-5.4 miniMuse Spark 1.3
ProviderOpenAIMeta
ReleasedMar 17, 2026Sep 2, 2026
AvailabilityActiveActive
Model typeProprietaryProprietary
ParametersNot publishedNot published
ArchitectureNot publishedNot published
Context window400,000 tokens1,048,576 tokens
Knowledge cutoffAugust 31, 2025Not published
Technical sourcesModelModel, Context

Pricing

API pricing compared

The table compares official standard API rates per 1M tokens, including published cache pricing. Batch, fast, priority, regional surcharges, tool calls, and cloud platform pricing are excluded.

API pricing for GPT-5.4 mini and Muse Spark 1.3
Price typeGPT-5.4 miniMuse Spark 1.3
API input$0.75$1.25
API output$4.5$4.25
Cache read$0.07$0.15
Cache write (5 min.)Not listedNot listed
Cache write (1 hr.)Not listedNot listed
Price verified07/30/2026 Source09/03/2026 Source
GPT-5.4 miniMuse Spark 1.3
API inputUSD per 1M tokens, base tier
GPT-5.4 miniLower price$0.75
Muse Spark 1.3$1.25
API outputUSD per 1M tokens, base tier
GPT-5.4 mini$4.5
Muse Spark 1.3Lower price$4.25
Cache readUSD per 1M tokens, base tier
GPT-5.4 miniLower price$0.075
Muse Spark 1.3$0.15

Key to the marks:better valuebetter, but not conclusivetie

Pricing by provider

Direct developer pricing and provider endpoint tariffs routed through OpenRouter are listed separately. Prices are in USD per 1M tokens. Context-dependent direct tiers plus regional, Flex, Priority, and other OpenRouter tariffs remain individually identifiable.

Provider pricing for GPT-5.4 mini and Muse Spark 1.3
ModelProviderPurchase route and tariffInput per 1M tokensOutput per 1M tokensSource
GPT-5.4 miniOpenAIDirect from developerStandard API$0.75$4.5Source07/30/2026
AzureVia OpenRouterazure$0.75$4.5Source09/08/2026
AzureVia OpenRouterazure/us$0.825$4.95Source09/08/2026
OpenAIVia OpenRouteropenai$0.75$4.5Source09/08/2026
OpenAIVia OpenRouteropenai/fast$1.5$9Source09/08/2026
OpenAIVia OpenRouteropenai/flexLowest listed price: $0.375Lowest listed price: $2.25Source09/08/2026
Muse Spark 1.3MetaDirect from developerStandard APILowest listed price: $1.25Lowest listed price: $4.25Source09/03/2026
MetaVia OpenRoutermetaLowest listed price: $1.25Lowest listed price: $4.25Source09/08/2026

Performance

Shared benchmarks

Only published results with the same benchmark version, task, metric, and comparison cohort are paired. Different reasoning levels, agents, harnesses, or output limits appear directly in the table.

Capability profile from matched benchmarks

Each axis averages directly matched benchmark families. A value of 100 means the stronger value within this pair, not a universal quality score.

Not enough directly matched categories for a reliable radar

Only 0 of at least 5 categories have comparable, direct model measurements. The benchmark tables below show the available evidence without filling missing axes.

No directly comparable result series yet

No published benchmark for GPT-5.4 mini and Muse Spark 1.3 currently matches in version, task, metric, and comparison cohort. We therefore show no estimated or blended values.

Our model tests

Community tests you can inspect

Compare how the models respond to the same prompt. Each test shows the first attempt, with no subsequent fixes to the generated code. These results do not contribute to an overall score.

Pelican on a bicycle

A community classic for free-form SVG drawing.

GPT-5.4 mini

The response reached the token limit. No complete recording is available.

First attempt
Run date
7 Sept 2026
API provider
openrouter
Requested API model
openai/gpt-5.4-mini
API model reported in response
openai/gpt-5.4-mini
Pinned endpoint
OpenAI | openai/gpt-5.4-mini-20260317
Reasoning setting
high
Temperature
Provider default
Token limit including reasoning
8,192 tokens
Test protocol
community-visual-tests-v1
Technical checks
Failed
Response time
67 s

Not yet visually reviewed. A successful recording does not confirm correct physics or full compliance with the prompt.

Muse Spark 1.3

API access was unavailable for this run. The model was not evaluated.

First attempt
Run date
7 Sept 2026
API provider
openrouter
Requested API model
meta/muse-spark-1.3
Pinned endpoint
Meta | meta/muse-spark-1.3-20260902
Reasoning setting
high
Temperature
Provider default
Token limit including reasoning
8,192 tokens
Test protocol
community-visual-tests-v1
Technical checks
Not run

Not yet visually reviewed. A successful recording does not confirm correct physics or full compliance with the prompt.

Prompt and test conditions

Generate an SVG of a pelican riding a bicycle

Token limit including reasoning: 8,192 tokens

Task origin (Simon Willison)

How to read this comparison

Winning one benchmark is not an overall verdict

Your workload, budget, and required context length matter most. A coding benchmark says little about visual understanding or agent performance.

The standard price table uses direct developer rates. The provider comparison labels OpenRouter endpoints, regions, and special tariffs separately.

Every result links to its measurement source and retrieval date. Labels distinguish vendor reports, official benchmark leaderboards, and independent evaluations. Disputed or archived results are excluded.

More matchups

Related LLM comparisons

Compare GPT-5.4 mini and Muse Spark 1.3 with other leading models using the same data and benchmark logic.

View the complete LLM comparison