GLM-5.1 vs GPT-5
Side-by-side benchmark comparison across coding, math, reasoning, speed, and pricing.
GLM-5.1 by Zhipu AI wins on 6 of 9 benchmarks against GPT-5 by OpenAI, which leads on 3. This head-to-head comparison covers coding, math, reasoning, speed, and pricing metrics from our benchmark data.
Category-by-Category Breakdown
Coding: In coding, GLM-5.1 scores 55.8 on AA Coding Index compared to GPT-5's 37.8, while GLM-5.1 scores 1279 on Design Arena ELO compared to GPT-5's 1172, while GLM-5.1 scores 1278 on Website Arena ELO compared to GPT-5's 1194.
Reasoning: In reasoning, GPT-5 scores 86.0% on GPQA Diamond compared to GLM-5.1's 82.9%, while GLM-5.1 scores 74.1% on τ²-Bench Airline compared to GPT-5's 68.4%.
Context: In context, GPT-5 scores 400K on Context Length compared to GLM-5.1's 205K.
Pricing Comparison
GLM-5.1 costs $0.97/1M input tokens and $3.0/1M output tokens, while GPT-5 costs $1.3/1M input and $10.0/1M output. GLM-5.1 is the more affordable option for API usage.
Verdict
GLM-5.1 leads across the board in affordability, making it the stronger overall choice in this comparison.
View Individual Model Pages
GLM-5.1 vs GPT-5 — FAQ
Which is better, GLM-5.1 or GPT-5?
GLM-5.1 wins on more benchmarks overall (6 vs 3). However, the best choice depends on your specific needs — each model excels in different areas.
How does GLM-5.1 compare to GPT-5 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-5.1 cheaper than GPT-5?
Yes, GLM-5.1 is cheaper. GLM-5.1 costs $0.97/1M input and $3.0/1M output tokens. GPT-5 costs $1.3/1M input and $10.0/1M output tokens.
Which is faster, GLM-5.1 or GPT-5?
Output speed data is not available for both models. Check the speed section of the comparison above for available performance data.
What benchmarks does the GLM-5.1 vs GPT-5 comparison cover?
This comparison covers 9 benchmarks including GPQA Diamond, Input Cost, Output Cost, Context Length, AA Coding Index, Cached Input Cost, Design Arena ELO, τ²-Bench Airline, and more. Metrics span general intelligence, coding, math, reasoning, speed, and cost categories.