GLM-5 vs GPT-5.1
Side-by-side benchmark comparison across coding, math, reasoning, speed, and pricing.
GPT-5.1 by OpenAI wins on 6 of 11 benchmarks against GLM-5 by Zhipu AI, which leads on 5. This head-to-head comparison covers coding, math, reasoning, speed, and pricing metrics from our benchmark data.
Category-by-Category Breakdown
General Intelligence: In general intelligence, GPT-5.1 scores 1464 on Chatbot Arena ELO compared to GLM-5's 1456.
Coding: In coding, GLM-5 scores 1235 on Design Arena ELO compared to GPT-5.1's 1158, while GLM-5 scores 1260 on Website Arena ELO compared to GPT-5.1's 1179.
Reasoning: In reasoning, GPT-5.1 scores 86.2% on GPQA Diamond compared to GLM-5's 78.6%, while GPT-5.1 scores 75.7% on τ²-Bench Airline compared to GLM-5's 75.3%.
Context: In context, GPT-5.1 scores 400K on Context Length compared to GLM-5's 205K.
Pricing Comparison
GLM-5 costs $0.60/1M input tokens and $1.9/1M output tokens, while GPT-5.1 costs $1.3/1M input and $10.0/1M output. GLM-5 is the more affordable option for API usage.
Speed Comparison
GLM-5 generates output at 55 tok/s compared to GPT-5.1's 95 tok/s, and the time to first token is 1030 ms for GLM-5 versus 350 ms for GPT-5.1. GPT-5.1 delivers faster throughput.
Verdict
For developers prioritizing affordability, GLM-5 has the edge. For those who value general intelligence and speed, GPT-5.1 is the stronger choice.
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GLM-5 vs GPT-5.1 — FAQ
Which is better, GLM-5 or GPT-5.1?
GPT-5.1 wins on more benchmarks overall (6 vs 5). However, the best choice depends on your specific needs — each model excels in different areas.
How does GLM-5 compare to GPT-5.1 for coding?
SWE-bench Verified data is not available for both models. Check the detailed comparison charts above for other coding-related metrics.
Is GLM-5 cheaper than GPT-5.1?
Yes, GLM-5 is cheaper. GLM-5 costs $0.60/1M input and $1.9/1M output tokens. GPT-5.1 costs $1.3/1M input and $10.0/1M output tokens.
Which is faster, GLM-5 or GPT-5.1?
GPT-5.1 is faster, generating output at 95 tok/s compared to 55 tok/s. Faster output speed means shorter wait times for API responses.
What benchmarks does the GLM-5 vs GPT-5.1 comparison cover?
This comparison covers 11 benchmarks including Chatbot Arena ELO, GPQA Diamond, Output Speed, Time to First Token, Input Cost, Output Cost, Context Length, Cached Input Cost, and more. Metrics span general intelligence, coding, math, reasoning, speed, and cost categories.