Model Comparison
GLM-5.2 (max)
vs. GPT-5.5 (high)
Comparing 2 AI models · 7 benchmarks · Z AI, OpenAI
Recommended Pick
Z GLM-5.2 (max) 9 metric wins Strongest on: Value, Input price, Output price
Best Value
GLM-5.2 (max)
100.0 value score
60.2 reasoning / $2.15/1M
Lowest Price
GLM-5.2 (max)
$1.40/1M input price
Best Reasoning
GPT-5.5 (high)
63.1 reasoning score
Blends available reasoning benchmarks
Best for Coding
GLM-5.2 (max)
68.8 coding index
Composite Indices
Higher is better; speed and price are normalized
Standard Benchmarks
Only benchmarks with data are shown
Differences That Matter
Best value
GLM-5.2 (max) has the strongest quality-to-price mix at 100.0 out of 100 value points.
Price gap
GLM-5.2 (max) is 3.6x cheaper on input tokens than GPT-5.5 (high).
Speed gap
GLM-5.2 (max) generates about 1.6x as many tokens per second as GPT-5.5 (high).
Reasoning gap
GPT-5.5 (high) leads GLM-5.2 (max) by 2.9 points on reasoning.
Coding gap
GLM-5.2 (max) leads GPT-5.5 (high) by 10.3 points on coding.
Response Face-Off
Run one prompt through the selected models and compare response quality with live speed and cost context.
GLM-5.2 (max)
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-5.5 (high)
OpenAI
TTFT
—
Time
—
tok/s
—
Tokens
—
Cost
—
Which answer was more useful?
Full Comparison
| Metric | Top Pick Z GLM-5.2 (max) | Op GPT-5.5 (high) |
|---|---|---|
| Pricing per 1M tokens | ||
| Input Cost | $1.40/1M | $5.00/1M |
| Output Cost | $4.40/1M | $30.00/1M |
| Blended (3:1) | $2.15/1M | $11.25/1M |
| Specifications | ||
| Organization | Z AI | OpenAI |
| Release Date | Jun 16, 2026 | Apr 23, 2026 |
| Performance & Speed | ||
| Throughput | 97.7 tok/s | 62.4 tok/s |
| TTFT | 1774ms | 17665ms |
| Latency | 22254ms | 17665ms |
| Composite Indices | ||
| Value Score | 100.0 | 20.0 |
| Reasoning Score | 60.2 | 63.1 |
| Intelligence | 51.1 | 53.1 |
| Coding | 68.8 | 58.5 |
| Standard Benchmarks | ||
| GPQA | 89.5% | 93.2% |
| HLE | 40.1% | 43.0% |
| SciCode | 50.5% | 55.9% |
| LCR | 71.3% | 73.3% |
| IFBench | 73.3% | 71.6% |
| TAU-bench v2 | 99.1% | 93.0% |
| TerminalBench Hard | 50.8% | 59.8% |
Key Takeaways
GLM-5.2 (max) offers the best value at $1.40/1M, making it ideal for high-volume applications and cost-conscious projects.
GPT-5.5 (high) has the strongest reasoning profile with a 63.1 reasoning score, combining the available reasoning-heavy benchmarks.
GLM-5.2 (max) reaches a 68.8 coding index, making it the top choice for software development and code generation tasks.
All models support context windows of ∞+ tokens, suitable for processing lengthy documents and maintaining extended conversations.
When to Choose Each Model
GLM-5.2 (max)
- Cost-sensitive applications
- High-volume processing
- Code generation
- Software development
GPT-5.5 (high)
- Complex reasoning tasks
- Research & analysis
