Model Comparison
GLM-4.5 (Reasoning)
vs. GPT-5 (ChatGPT)
Comparing 2 AI models · 12 benchmarks · Z AI, OpenAI
Recommended Pick
Z GLM-4.5 (Reasoning) 14 metric wins Strongest on: Value, Input price, Output price
Best Value
GLM-4.5 (Reasoning)
100.0 value score
63.2 reasoning / $1.00/1M
Lowest Price
GLM-4.5 (Reasoning)
$0.60/1M input price
Best Reasoning
GLM-4.5 (Reasoning)
63.2 reasoning score
Blends available reasoning benchmarks
Composite Indices
Higher is better; speed and price are normalized
Standard Benchmarks
Only benchmarks with data are shown
Differences That Matter
Best value
GLM-4.5 (Reasoning) has the strongest quality-to-price mix at 100.0 out of 100 value points.
Price gap
GLM-4.5 (Reasoning) is 2.1x cheaper on input tokens than GPT-5 (ChatGPT).
Speed gap
GPT-5 (ChatGPT) generates about 3.6x as many tokens per second as GLM-4.5 (Reasoning).
Reasoning gap
GLM-4.5 (Reasoning) leads GPT-5 (ChatGPT) by 25.9 points on reasoning.
Top-pick rationale
GLM-4.5 (Reasoning) wins 14 measurable categories, including Value, Input price, Output price, Blended price.
Response Face-Off
Run one prompt through the selected models and compare response quality with live speed and cost context.
GLM-4.5 (Reasoning)
Z AI
TTFT
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Time
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tok/s
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Tokens
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Cost
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GPT-5 (ChatGPT)
OpenAI
TTFT
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Time
—
tok/s
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Tokens
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Cost
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Which answer was more useful?
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Full Comparison
| Metric | Top Pick Z GLM-4.5 (Reasoning) | Op GPT-5 (ChatGPT) |
|---|---|---|
| Pricing per 1M tokens | ||
| Input Cost | $0.60/1M | $1.25/1M |
| Output Cost | $2.20/1M | $10.00/1M |
| Blended (3:1) | $1.00/1M | $3.44/1M |
| Specifications | ||
| Organization | Z AI | OpenAI |
| Release Date | Jul 28, 2025 | Aug 7, 2025 |
| Performance & Speed | ||
| Throughput | 54.5 tok/s | 193.6 tok/s |
| TTFT | 1431ms | 493ms |
| Latency | 38146ms | 493ms |
| Composite Indices | ||
| Value Score | 100.0 | 17.2 |
| Reasoning Score | 63.2 | 37.3 |
| Intelligence | 19.5 | 15.3 |
| Math | 73.7 | 48.3 |
| Standard Benchmarks | ||
| GPQA | 78.2% | 68.6% |
| MMLU Pro | 83.5% | 82.0% |
| HLE | 12.2% | 5.8% |
| LiveCodeBench | 73.8% | 54.3% |
| MATH 500 | 97.9% | — |
| AIME 2025 | 73.7% | 48.3% |
| AIME (Original) | 87.3% | — |
| SciCode | 34.8% | 37.8% |
| LCR | 48.3% | 63.7% |
| IFBench | 44.1% | 45.0% |
| TAU-bench v2 | 43.0% | 0.0% |
| TerminalBench Hard | 22.0% | 12.9% |
Key Takeaways
GLM-4.5 (Reasoning) offers the best value at $0.60/1M, making it ideal for high-volume applications and cost-conscious projects.
GLM-4.5 (Reasoning) has the strongest reasoning profile with a 63.2 reasoning score, combining the available reasoning-heavy benchmarks.
All models support context windows of ∞+ tokens, suitable for processing lengthy documents and maintaining extended conversations.
When to Choose Each Model
GLM-4.5 (Reasoning)
- Cost-sensitive applications
- High-volume processing
- Complex reasoning tasks
- Research & analysis
GPT-5 (ChatGPT)
- General-purpose AI
- Versatile applications
