Model Comparison
GLM-5.1 (Reasoning)
vs. GPT-4.1
Comparing 2 AI models · 12 benchmarks · Z AI, OpenAI
Recommended Pick
Z GLM-5.1 (Reasoning) 14 metric wins Strongest on: Value, Input price, Output price
Best Value
GLM-5.1 (Reasoning)
100.0 value score
55.4 reasoning / $2.15/1M
Lowest Price
GLM-5.1 (Reasoning)
$1.40/1M input price
Best Reasoning
GLM-5.1 (Reasoning)
55.4 reasoning score
Blends available reasoning benchmarks
Best for Coding
GLM-5.1 (Reasoning)
43.4 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 (Reasoning) has the strongest quality-to-price mix at 100.0 out of 100 value points.
Price gap
GLM-5.1 (Reasoning) is 1.4x cheaper on input tokens than GPT-4.1.
Speed gap
GPT-4.1 generates about 1.8x as many tokens per second as GLM-5.1 (Reasoning).
Reasoning gap
GLM-5.1 (Reasoning) leads GPT-4.1 by 12.3 points on reasoning.
Coding gap
GLM-5.1 (Reasoning) leads GPT-4.1 by 21.6 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 (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-4.1
OpenAI
TTFT
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Time
—
tok/s
—
Tokens
—
Cost
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Which answer was more useful?
Full Comparison
| Metric | Top Pick Z GLM-5.1 (Reasoning) | Op GPT-4.1 |
|---|---|---|
| Pricing per 1M tokens | ||
| Input Cost | $1.40/1M | $2.00/1M |
| Output Cost | $4.40/1M | $8.00/1M |
| Blended (3:1) | $2.15/1M | $3.50/1M |
| Specifications | ||
| Organization | Z AI | OpenAI |
| Release Date | Apr 7, 2026 | Apr 14, 2025 |
| Performance & Speed | ||
| Throughput | 72.0 tok/s | 126.6 tok/s |
| TTFT | 870ms | 563ms |
| Latency | 53549ms | 563ms |
| Composite Indices | ||
| Value Score | 100.0 | 47.8 |
| Reasoning Score | 55.4 | 43.1 |
| Intelligence | 51.4 | 26.3 |
| Coding | 43.4 | 21.8 |
| Math | — | 34.7 |
| Standard Benchmarks | ||
| GPQA | 86.8% | 66.6% |
| MMLU Pro | — | 80.6% |
| HLE | 28.0% | 4.6% |
| LiveCodeBench | — | 45.7% |
| MATH 500 | — | 91.3% |
| AIME 2025 | — | 34.7% |
| AIME (Original) | — | 43.7% |
| SciCode | 43.8% | 38.1% |
| LCR | 62.3% | 61.0% |
| IFBench | 76.3% | 43.0% |
| TAU-bench v2 | 97.7% | 47.1% |
| TerminalBench Hard | 43.2% | 13.6% |
Key Takeaways
GLM-5.1 (Reasoning) offers the best value at $1.40/1M, making it ideal for high-volume applications and cost-conscious projects.
GLM-5.1 (Reasoning) has the strongest reasoning profile with a 55.4 reasoning score, combining the available reasoning-heavy benchmarks.
GLM-5.1 (Reasoning) reaches a 43.4 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 (Reasoning)
- Cost-sensitive applications
- High-volume processing
- Complex reasoning tasks
- Research & analysis
- Code generation
- Software development
GPT-4.1
- General-purpose AI
- Versatile applications
