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GLM-5.1 vs GPT-5.5
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Scores
Intelligence (ECI)150159
Coding6989
Math6397
Reasoning & Knowledge4891
Agentic & Tools—95
Specifications
DeveloperZ.ai (Zhipu AI)OpenAI
Family—GPT
ReleasedApr 7, 2026Apr 23, 2026
Parameters754B—
Availability—API access
Context window203K1.1M
Price — $/M input$0.98$5.00
Price — $/M output$3.08$30.00
Inputstextfile, image, text
Outputstexttext
Benchmarks
AIME 2024/202592%100%
FrontierMath33%52%
FrontierMath Tier 413%35%
GPQA Diamond85%94%
SimpleBench59%69%
SimpleQA Verified37%63%
SWE-bench Verified74%81%
WebDev Arena15341505
WeirdML57%85%
APEX—38%
ARC-AGI—95%
ARC-AGI-2—85%
GSO (code optimization)—40%
Terminal-Bench—85%
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.
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Benchmarks & model data from Epoch AI (CC BY); pricing & specs from OpenRouter. ECI = Epoch Capabilities Index.