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OpenAIGPT-5.4 ProVSZ.ai (Zhipu AI)GLM-5.1

Analysis by:the whichllmmodel Editorial Team|Updated: June 2026

Our Take

Standardized reasoning and coding benchmarks are currently pending verification for one or both of these models. We recommend testing GPT-5.4 Pro and GLM-5.1 directly in their respective provider playgrounds to see which fits your specific prompt styles best.
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Model Specs

GPT-5.4 Pro

Benchmarks & Scores

Coding (swe-bench-pro)
N/A

complex codebases, multi-file repositories, and architectural planning

Reasoning (gpqa-diamond)
67.6%

graduate-level science QA

Cost & Context

Cost (per 1M tokens)15.6x cheaper
$0.14Input: $0.05 | Output: $0.40
Context WindowLarger
400k tokens
Model Specs

GLM-5.1

Open SourceAPI Available

Benchmarks & Scores

Coding (swe-bench-pro)
58.4%

complex codebases, multi-file repositories, and architectural planning

Reasoning (gpqa-diamond)Winner (+18.6%)
86.2%

graduate-level science QA

Cost & Context

Cost (per 1M tokens)
$2.15Input: $1.40 | Output: $4.40
Context Window
202.75k tokens

Frequently Asked Questions about GPT-5.4 Pro vs GLM-5.1

GPT-5.4 Pro is cheaper than GLM-5.1. GPT-5.4 Pro has a blended cost of $0.14/1M tokens, which is about 15.6x cheaper than GLM-5.1 at $2.15/1M tokens.

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