Noometry

Model comparison

GPT-5.5 Pro vs Muse Spark 1.2

GPT-5.5 Pro is the stronger model overall, scoring 64.3 to 49.8 on the Noometry Index. Muse Spark 1.2 costs 34× less per token, which makes it the better buy when GPT-5.5 Pro's lead doesn't matter for your workload.

Last verified . 5 shared benchmarks.

GPT-5.5 Pro OpenAI

64.3

Rank #7 Confirmed

Muse Spark 1.2 Meta

49.8

Rank #44 Confirmed

Summary

  • They share 5 benchmarks with published results for both. GPT-5.5 Pro scores higher in 3 categories and Muse Spark 1.2 in 0 categories; 3 gaps are clear of the uncertainty.
  • The widest gap is in math, where GPT-5.5 Pro leads 83.8 to 43.8.
  • The biggest single-benchmark swing is CritPt: 30.6% for GPT-5.5 Pro and 17.7% for Muse Spark 1.2.
  • Muse Spark 1.2 is cheaper at $1.25 / $4.25 per million input/output tokens, against $30 / $180 for GPT-5.5 Pro.
  • GPT-5.5 Pro accepts more context: 1.05M tokens versus 1.05M.

Side by side

GPT-5.5 ProMuse Spark 1.2
ProviderOpenAIMeta
Noometry Index64.349.8
Released2026-04-232026-08-05
WeightsProprietaryProprietary
Context window1.05M1.05M
Max output128K131K
Input $ / M tokens$30$1.25
Output $ / M tokens$180$4.25
Results tracked1428

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Category by category

Coding Not comparable

GPT-5.5 Pro: —, Muse Spark 1.2: 48.6 (#49)

BenchmarkGPT-5.5 ProMuse Spark 1.2
DeepSWE—54.9%
LMArena WebDev—1532
FrontierSWE—12%
SciCode—56.4%
WeirdML—60.3%
LMArena Coding—1497

Agentic & Tool Use Not comparable

GPT-5.5 Pro: —, Muse Spark 1.2: 29.5 (#77)

BenchmarkGPT-5.5 ProMuse Spark 1.2
APEX-Agents—36.4%
GDP.pdf—16%

Reasoning GPT-5.5 Pro leads

GPT-5.5 Pro: 73.6 (#7), Muse Spark 1.2: 50.4 (#32)

BenchmarkGPT-5.5 ProMuse Spark 1.2
SimpleBench76.9%74.5%
CritPt30.6%17.7%
DTBench96%94.7%
LMCA53.9%48.4%
Epoch Capabilities Index162.45155.18
ARC-AGI-284.6%—
NYT Connections (extended)—79.2%
ARC-AGI-196.5%—
Chess Puzzles64%—
LMArena Hard Prompts—1490

Math GPT-5.5 Pro leads

GPT-5.5 Pro: 83.8 (#8), Muse Spark 1.2: 43.8 (#68)

BenchmarkGPT-5.5 ProMuse Spark 1.2
FrontierMath (Tiers 1-3)87.7%—
FrontierMath Tier 478%—
OTIS Mock AIME 2024-2025100%—
ProofBench—43%
FrontierMath (Feb 2025 set)52.4%—
FrontierMath Tier 4 (v1)39.6%—

Knowledge GPT-5.5 Pro leads

GPT-5.5 Pro: 64.2 (#17), Muse Spark 1.2: 53.9 (#49)

BenchmarkGPT-5.5 ProMuse Spark 1.2
GPQA Diamond93.9%—
SimpleQA Verified—60.3%
LMArena Expert—1485

Multimodal Not comparable

GPT-5.5 Pro: —, Muse Spark 1.2: 42.6 (#24)

BenchmarkGPT-5.5 ProMuse Spark 1.2
LMArena Vision—1304

Multilingual Not comparable

GPT-5.5 Pro: —, Muse Spark 1.2: 57.4 (#10)

BenchmarkGPT-5.5 ProMuse Spark 1.2
LMArena Non-English—1479
LMArena Chinese—1519
LMArena Russian—1494

Instruction Following Not comparable

GPT-5.5 Pro: —, Muse Spark 1.2: 77.1 (#30)

BenchmarkGPT-5.5 ProMuse Spark 1.2
LMArena Instruction Following—1466

Long Context Not comparable

GPT-5.5 Pro: —, Muse Spark 1.2: 45.4 (#35)

BenchmarkGPT-5.5 ProMuse Spark 1.2
LMArena Longer Query—1483

Writing & Preference Not comparable

GPT-5.5 Pro: —, Muse Spark 1.2: 72.6 (#14)

BenchmarkGPT-5.5 ProMuse Spark 1.2
LMArena Text—1486
LMArena Creative Writing—1444
EQ-Bench Creative Writing—1840
LMArena Multi-Turn—1504

Frequently asked questions

Is GPT-5.5 Pro better than Muse Spark 1.2?

GPT-5.5 Pro is the stronger model overall, scoring 64.3 to 49.8 on the Noometry Index. Muse Spark 1.2 costs 34× less per token, which makes it the better buy when GPT-5.5 Pro's lead doesn't matter for your workload.

Which is cheaper, GPT-5.5 Pro or Muse Spark 1.2?

Muse Spark 1.2 is cheaper. It lists at $1.25 per million input tokens and $4.25 per million output tokens; GPT-5.5 Pro lists at $30 and $180.

Which has the bigger context window?

GPT-5.5 Pro does, with 1.05M tokens against 1.05M.

How many benchmarks do GPT-5.5 Pro and Muse Spark 1.2 share?

5 benchmarks have published results for both models. GPT-5.5 Pro has 14 scored results on Noometry and Muse Spark 1.2 has 28.

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