OpenAIGPT-5.4VSZ.ai (Zhipu AI)GLM-5.1
Our Take
We recommend GPT-5.4 if your workflow requires peak reasoning performance, or the 2.6x cheaper GLM-5.1 to optimize your API budget. While both models deliver similar coding capabilities, GPT-5.4 holds a clear lead in reasoning. Choose GPT-5.4 for complex logic, or GLM-5.1 for cost optimization.
▶WHY?
Benchmark Calculations & Evidence:
Coding Benchmarks: Both models were evaluated on the SWE-bench Pro benchmark. GPT-5.4 scored 57.7%, while GLM-5.1 scored 58.4%.
Reasoning Benchmarks: Both models were evaluated on the GPQA Diamond benchmark. GPT-5.4 scored 92.8%, while GLM-5.1 scored 86.2%.
Cost Efficiency: GLM-5.1 pricing ($1.4/M input, $4.4/M output) is 2.6x cheaper than GPT-5.4 ($2.5/M input, $15/M output).
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Benchmarks & Scores
Coding (swe-bench-pro)
57.7%complex codebases, multi-file repositories, and architectural planning
Reasoning (gpqa-diamond)Winner (+6.6%)
92.8%graduate-level science QA
Cost & Context
Cost (per 1M tokens)
$5.63Input: $2.50 | Output: $15.00Context WindowLarger
1.05M tokensBenchmarks & Scores
Coding (swe-bench-pro)Winner (+0.7%)
58.4%complex codebases, multi-file repositories, and architectural planning
Reasoning (gpqa-diamond)
86.2%graduate-level science QA
Cost & Context
Cost (per 1M tokens)2.6x cheaper
$2.15Input: $1.40 | Output: $4.40Context Window
202.75k tokensFrequently Asked Questions about GPT-5.4 vs GLM-5.1
GLM-5.1 is cheaper than GPT-5.4. GLM-5.1 has a blended cost of $2.15/1M tokens, which is about 2.6x cheaper than GPT-5.4 at $5.63/1M tokens.
GLM-5.1 is better for coding tasks on this benchmark. It scores 58.4% on swe-bench-pro (complex codebases, multi-file repositories, and architectural planning) compared to GPT-5.4 which scores 57.7%.
Related Matchups
Explore similar comparisons for GPT-5.4 and GLM-5.1.
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