Model Comparison
GLM-4.5-Air
vs. Gemini 3.1 Pro Preview
Comparing 2 AI models · 12 benchmarks · Z AI, Google
Recommended Pick
Go Gemini 3.1 Pro Preview 12 metric wins Strongest on: Throughput, Latency, Reasoning
Best Value
GLM-4.5-Air
100.0 value score
61.2 reasoning / $0.37/1M
Lowest Price
GLM-4.5-Air
$0.17/1M input price
Best Reasoning
Gemini 3.1 Pro Preview
65.3 reasoning score
Blends available reasoning benchmarks
Best for Coding
Gemini 3.1 Pro Preview
55.5 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-4.5-Air has the strongest quality-to-price mix at 100.0 out of 100 value points.
Price gap
GLM-4.5-Air is 11.8x cheaper on input tokens than Gemini 3.1 Pro Preview.
Speed gap
Gemini 3.1 Pro Preview generates about 1.8x as many tokens per second as GLM-4.5-Air.
Reasoning gap
Gemini 3.1 Pro Preview leads GLM-4.5-Air by 4.1 points on reasoning.
Coding gap
Gemini 3.1 Pro Preview leads GLM-4.5-Air by 31.7 points on coding.
Response Face-Off
Run one prompt through the selected models and compare response quality with live speed and cost context.
GLM-4.5-Air
Z AI
TTFT
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Time
—
tok/s
—
Tokens
—
Cost
—
Gemini 3.1 Pro Preview
TTFT
—
Time
—
tok/s
—
Tokens
—
Cost
—
Which answer was more useful?
Full Comparison
| Metric | Z GLM-4.5-Air | Top Pick Go Gemini 3.1 Pro Preview |
|---|---|---|
| Pricing per 1M tokens | ||
| Input Cost | $0.17/1M | $2.00/1M |
| Output Cost | $0.98/1M | $12.00/1M |
| Blended (3:1) | $0.37/1M | $4.50/1M |
| Specifications | ||
| Organization | Z AI | |
| Release Date | Jul 28, 2025 | Feb 19, 2026 |
| Performance & Speed | ||
| Throughput | 75.5 tok/s | 135.9 tok/s |
| TTFT | 1816ms | 28145ms |
| Latency | 28297ms | 28145ms |
| Composite Indices | ||
| Value Score | 100.0 | 8.8 |
| Reasoning Score | 61.2 | 65.3 |
| Intelligence | 23.2 | 57.2 |
| Coding | 23.8 | 55.5 |
| Math | 80.7 | — |
| Standard Benchmarks | ||
| GPQA | 73.3% | 94.1% |
| MMLU Pro | 81.5% | — |
| HLE | 6.8% | 44.7% |
| LiveCodeBench | 68.4% | — |
| MATH 500 | 96.5% | — |
| AIME 2025 | 80.7% | — |
| AIME (Original) | 67.3% | — |
| SciCode | 30.6% | 58.9% |
| LCR | 43.7% | 72.7% |
| IFBench | 37.6% | 77.1% |
| TAU-bench v2 | 46.5% | 95.6% |
| TerminalBench Hard | 20.5% | 53.8% |
Key Takeaways
GLM-4.5-Air offers the best value at $0.17/1M, making it ideal for high-volume applications and cost-conscious projects.
Gemini 3.1 Pro Preview has the strongest reasoning profile with a 65.3 reasoning score, combining the available reasoning-heavy benchmarks.
Gemini 3.1 Pro Preview reaches a 55.5 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-4.5-Air
- Cost-sensitive applications
- High-volume processing
Gemini 3.1 Pro Preview
- Complex reasoning tasks
- Research & analysis
- Code generation
- Software development
