Model Comparison
GPT-5.5 (xhigh)
vs. GLM-5.2 (max)
Comparing 2 AI models · 7 benchmarks · OpenAI, Z AI
Recommended Pick
Op GPT-5.5 (xhigh) 9 metric wins Strongest on: Reasoning, Intelligence, Coding
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 (xhigh)
64.2 reasoning score
Blends available reasoning benchmarks
Best for Coding
GPT-5.5 (xhigh)
74.9 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 (xhigh).
Speed gap
GLM-5.2 (max) generates about 1.5x as many tokens per second as GPT-5.5 (xhigh).
Reasoning gap
GPT-5.5 (xhigh) leads GLM-5.2 (max) by 4.0 points on reasoning.
Coding gap
GPT-5.5 (xhigh) leads GLM-5.2 (max) by 6.1 points on coding.
Response Face-Off
Run one prompt through the selected models and compare response quality with live speed and cost context.
GPT-5.5 (xhigh)
OpenAI
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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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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Which answer was more useful?
Full Comparison
| Metric | Top Pick Op GPT-5.5 (xhigh) | Z GLM-5.2 (max) |
|---|---|---|
| Pricing per 1M tokens | ||
| Input Cost | $5.00/1M | $1.40/1M |
| Output Cost | $30.00/1M | $4.40/1M |
| Blended (3:1) | $11.25/1M | $2.15/1M |
| Specifications | ||
| Organization | OpenAI | Z AI |
| Release Date | Apr 23, 2026 | Jun 16, 2026 |
| Performance & Speed | ||
| Throughput | 62.6 tok/s | 96.2 tok/s |
| TTFT | 52139ms | 1805ms |
| Latency | 52139ms | 22585ms |
| Composite Indices | ||
| Value Score | 20.4 | 100.0 |
| Reasoning Score | 64.2 | 60.2 |
| Intelligence | 54.8 | 51.1 |
| Coding | 74.9 | 68.8 |
| Standard Benchmarks | ||
| GPQA | 93.5% | 89.5% |
| HLE | 44.3% | 40.1% |
| SciCode | 56.1% | 50.5% |
| LCR | 74.3% | 71.3% |
| IFBench | 75.9% | 73.3% |
| TAU-bench v2 | 93.9% | 99.1% |
| TerminalBench Hard | 60.6% | 50.8% |
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 (xhigh) has the strongest reasoning profile with a 64.2 reasoning score, combining the available reasoning-heavy benchmarks.
GPT-5.5 (xhigh) reaches a 74.9 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
GPT-5.5 (xhigh)
- Complex reasoning tasks
- Research & analysis
- Code generation
- Software development
GLM-5.2 (max)
- Cost-sensitive applications
- High-volume processing
