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GLM-5.1 vs GPT-5.5

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GLM-5.1GPT-5.5
GLM-5.1Z.ai (Zhipu AI) · 5 in the newsGPT-5.5OpenAI · 14 in the news
Scores
Intelligence (ECI)150159
Coding6989
Math6397
Reasoning & Knowledge4891
Agentic & Tools95
Specifications
DeveloperZ.ai (Zhipu AI)OpenAI
FamilyGPT
ReleasedApr 7, 2026Apr 23, 2026
Parameters754B
AvailabilityAPI 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%
APEX38%
ARC-AGI95%
ARC-AGI-285%
GSO (code optimization)40%
Terminal-Bench85%

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.