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GPT-5.3 Codex vs Muse Spark

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GPT-5.3 CodexMuse Spark
AttributeGPT-5.3 CodexOpenAI · 4 in the newsMuse SparkMeta AI · 2 in the news
Scores
Intelligence (ECI)156153
Coding6576
Math64
Reasoning & Knowledge8682
Agentic & Tools6563
Specifications
DeveloperOpenAIMeta AI
FamilyGPT
ReleasedFeb 5, 2026Apr 8, 2026
Parameters
AvailabilityAPI accessAPI access
Context window400K
Price — $/M input$1.75
Price — $/M output$14.00
Inputstext, image, file
Outputstext
Benchmarks
APEX32%
GPQA Diamond92%90%
Humanity's Last Exam40%41%
METR task horizon5.8 h
SciCode53%52%
SWE-bench Verified75%
Terminal-Bench78%
WebDev Arena14071513
WeirdML79%
τ²-bench86%92%
AIME 2024/202589%
FrontierMath39%
FrontierMath Tier 415%
SimpleQA Verified66%

Use-case scores are 0–100 percentile composites across each area’s benchmarks, ranked against every model from the past year. Highlighted cells lead each row. Open a model for the full picture.

Benchmarks & model data from Epoch AI (CC BY); pricing & specs from OpenRouter. ECI = Epoch Capabilities Index.