ZMIME
Comparison · 2 models · Updated Oct 4, 2026

GPT-5.4 mini vs Muse Spark 1.2

Muse Spark 1.2 comes out ahead, 72 to 63 on our weighted score, though GPT-5.4 mini is 16% cheaper per token.

  1. OpenAI

    GPT-5.4 mini

    Released Mar 17, 2026

    63/100
    • ECI148.8
    • Price$0.75 / $4.50
    • Context400K
    Full specs Remove GPT-5.4 mini
  2. Our pick

    Meta

    Muse Spark 1.2

    Released Aug 5, 2026

    72/100
    • ECI155.0
    • Price$1.25 / $4.25
    • Context1.05M
    Full specs Remove Muse Spark 1.2

  3. Add a model

    Make it a three-way comparison.

01 — Verdict

Muse Spark 1.2 is our pick

Muse Spark 1.2 is the better all-round choice, scoring 72/100 against GPT-5.4 mini (63). It leads on capability, inputs & features and context window. GPT-5.4 mini wins on price. The score weighs capability 50%, price 25%, inputs & features 15%, context window 10%.

  • CapabilityMuse Spark 1.2Capabilities Index (ECI): Muse Spark 1.2 155.0 · GPT-5.4 mini 148.8
  • Lowest priceGPT-5.4 miniGPT-5.4 mini $1.69 · Muse Spark 1.2 $2.00 per 1M tokens (3:1 blend)
  • Longest contextMuse Spark 1.2Muse Spark 1.2 1,048,576 · GPT-5.4 mini 400,000 tokens
  • Widest inputsMuse Spark 1.2GPT-5.4 mini: Text, Images · Muse Spark 1.2: Text, Images, PDFs, Audio, Video
  • Self-hostingNo open weightsBoth are available only through APIs
How the score is built
MeasureWeightGPT-5.4 miniMuse Spark 1.2
CapabilityCapabilities Index (ECI)50%7784
Price25%3936
Inputs & features15%70100
Context window10%4461
Overall100%63/10072/100
02 — Side by side

Every spec in one table

Highlighted cells lead their row. Dashes mean the data is not published.

GPT-5.4 mini vs Muse Spark 1.2 specifications side by side
SpecificationGPT-5.4 miniOpenAIMuse Spark 1.2Meta
Capability
Capabilities Index (ECI)148.8155.0 (best)
ECI rank#56 of 148#30 of 148 (best)
GPQA DiamondGraduate-level science questions86.9%—
FrontierMath Tiers 1–3Research-level mathematics51.2%—
OTIS Mock AIME 2024–2025Competition mathematics88.9%—
SimpleQA VerifiedShort factual questions29.4%60.3% (best)
Price per million tokens
Input$0.75 (best)$1.25
Output$4.50$4.25 (best)
Cached input$0.075 (best)$0.15
Blended (3:1)$1.69 (best)$2.00
Long-context rateSame rateSame rate
Price sourceOfficial OpenAI APIOfficial Meta API
Limits
Context window400,000 tokens1,048,576 tokens (best)
Max output128,000 tokens131,072 tokens (best)
Inputs and features
TextYesYes
ImagesYesYes
PDFsNoYes
AudioNoYes
VideoNoYes
ReasoningYeslow · medium · high · xhighYesminimal · low · medium · high · xhigh
Tool callingYesYes
Structured outputYesYes
Availability
WeightsProprietaryProprietary
API model IDgpt-5.4-minimuse-spark-1.2
API providers29 (best)15
ReleasedMar 17, 2026Aug 5, 2026
Knowledge cutoffAug 31, 2025—
03 — Cost

What would a month cost?

Enter your expected volume in millions of tokens. List prices only; caching and batch discounts would lower these.

  • GPT-5.4 mini$16.50
  • Muse Spark 1.2$21.00
04 — Questions

Which should you choose?

Which is better: GPT-5.4 mini or Muse Spark 1.2?

Muse Spark 1.2 is the better all-round choice, scoring 72/100 against GPT-5.4 mini (63). It leads on capability, inputs & features and context window. GPT-5.4 mini wins on price. The score weighs capability 50%, price 25%, inputs & features 15%, context window 10%.

Which is cheaper, GPT-5.4 mini or Muse Spark 1.2?

GPT-5.4 mini is cheaper at $0.75 input / $4.50 output per million tokens (official OpenAI API price). Muse Spark 1.2 costs $1.25 input / $4.25 output per million tokens (official Meta API price). At a typical mix of three input tokens to one output token, that is $1.69 per million tokens for GPT-5.4 mini versus $2.00 for Muse Spark 1.2 (1.2× as much).

Which scores higher on benchmarks?

Muse Spark 1.2 scores higher on the Capabilities Index (ECI): Muse Spark 1.2 155.0 (#30 of 148) and GPT-5.4 mini 148.8 (#56 of 148). Their confidence ranges do not overlap (152.8–157.5 vs 147.1–150.5), so the gap is a real one. On individual benchmarks: SimpleQA Verified — Muse Spark 1.2 60.3%, GPT-5.4 mini 29.4%.

Which is better for coding?

There are no published SWE-bench Verified results for GPT-5.4 mini and Muse Spark 1.2 yet, so there is no like-for-like coding score. On overall capability, Muse Spark 1.2 leads, which tends to carry over to coding, but test on your own codebase. Both support tool calling for agent workflows.

Which has the bigger context window?

Muse Spark 1.2 has the largest context window at 1,048,576 tokens, against 400,000 for GPT-5.4 mini. Maximum output per response: GPT-5.4 mini up to 128,000, Muse Spark 1.2 up to 131,072 tokens.

Which can read images, PDFs, audio or video?

GPT-5.4 mini accepts text and images; Muse Spark 1.2 accepts text, images, PDFs, audio and video. Muse Spark 1.2 handles the widest range of inputs.

Are any of these open source?

No. GPT-5.4 mini and Muse Spark 1.2 are proprietary and only available through APIs and apps.

Which is newer?

Muse Spark 1.2 is the newest, released Aug 5, 2026. GPT-5.4 mini came out Mar 17, 2026. Knowledge cutoff: GPT-5.4 mini Aug 31, 2025.

How do you decide the winner?

Each model gets a 0–100 score on capability (50%, independent benchmark results); price (25%, blended price per million tokens (3 input : 1 output), log scale); inputs & features (15%, image, PDF, audio and video input, tool calling, structured output and reasoning); context window (10%, maximum tokens per request, log scale). Dimensions missing for any model are dropped and the remaining weights rescaled, so every model is judged on the same evidence. Specs and prices come from public model listings and the labs’ own API pages; capability scores come from independent benchmark runs. Data updated Oct 4, 2026.

05 — Keep comparing

Related comparisons