Model Comparison
GLM-5.1 (Non-reasoning)
vs. GPT-5.2 Codex (xhigh)
Comparing 2 AI models · 7 benchmarks · Z AI, OpenAI
Recommended Pick
Op GPT-5.2 Codex (xhigh) 10 metric wins Strongest on: Throughput, Reasoning, Intelligence
Best Value
GLM-5.1 (Non-reasoning)
100.0 value score
48.3 reasoning / $2.15/1M
Lowest Price
GLM-5.1 (Non-reasoning)
$1.40/1M input price
Best Reasoning
GPT-5.2 Codex (xhigh)
54.5 reasoning score
Blends available reasoning benchmarks
Best for Coding
GPT-5.2 Codex (xhigh)
43.0 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-5.1 (Non-reasoning) has the strongest quality-to-price mix at 100.0 out of 100 value points.
Price gap
GLM-5.1 (Non-reasoning) is 1.3x cheaper on input tokens than GPT-5.2 Codex (xhigh).
Speed gap
GPT-5.2 Codex (xhigh) generates about 2.0x as many tokens per second as GLM-5.1 (Non-reasoning).
Reasoning gap
GPT-5.2 Codex (xhigh) leads GLM-5.1 (Non-reasoning) by 6.2 points on reasoning.
Coding gap
GPT-5.2 Codex (xhigh) leads GLM-5.1 (Non-reasoning) by 7.2 points on coding.
Response Face-Off
Run one prompt through the selected models and compare response quality with live speed and cost context.
GLM-5.1 (Non-reasoning)
Z AI
TTFT
—
Time
—
tok/s
—
Tokens
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Cost
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GPT-5.2 Codex (xhigh)
OpenAI
TTFT
—
Time
—
tok/s
—
Tokens
—
Cost
—
Which answer was more useful?
Full Comparison
| Metric | Z GLM-5.1 (Non-reasoning) | Top Pick Op GPT-5.2 Codex (xhigh) |
|---|---|---|
| Pricing per 1M tokens | ||
| Input Cost | $1.40/1M | $1.75/1M |
| Output Cost | $4.40/1M | $14.00/1M |
| Blended (3:1) | $2.15/1M | $4.81/1M |
| Specifications | ||
| Organization | Z AI | OpenAI |
| Release Date | Apr 7, 2026 | Dec 11, 2025 |
| Performance & Speed | ||
| Throughput | 63.0 tok/s | 128.6 tok/s |
| TTFT | 777ms | 2682ms |
| Latency | 777ms | 2682ms |
| Composite Indices | ||
| Value Score | 100.0 | 50.4 |
| Reasoning Score | 48.3 | 54.5 |
| Intelligence | 35.4 | 40.1 |
| Coding | 35.8 | 43.0 |
| Standard Benchmarks | ||
| GPQA | 83.9% | 89.9% |
| HLE | 25.6% | 33.5% |
| SciCode | 36.1% | 54.6% |
| LCR | 44.3% | 75.7% |
| IFBench | 52.0% | 77.6% |
| TAU-bench v2 | 97.1% | 92.1% |
| TerminalBench Hard | 35.6% | 37.1% |
Key Takeaways
GLM-5.1 (Non-reasoning) offers the best value at $1.40/1M, making it ideal for high-volume applications and cost-conscious projects.
GPT-5.2 Codex (xhigh) has the strongest reasoning profile with a 54.5 reasoning score, combining the available reasoning-heavy benchmarks.
GPT-5.2 Codex (xhigh) reaches a 43.0 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-5.1 (Non-reasoning)
- Cost-sensitive applications
- High-volume processing
GPT-5.2 Codex (xhigh)
- Complex reasoning tasks
- Research & analysis
- Code generation
- Software development
