Model Comparison
GLM-5.3-Flash
vs. Claude Sonnet 5.5 (Max, Default Fallback)
Comparing 2 AI models · 0 benchmarks · Z AI, Anthropic
Recommended Pick
Z GLM-5.3-Flash6 metric winsStrongest on: Value, Input price, Output price
Best Value
GLM-5.3-Flash
100.0 value score
41.8 reasoning / $0.24/1M
Lowest Price
GLM-5.3-Flash
$0.15/1M input price
Best Reasoning
Claude Sonnet 5.5 (Max, Default Fallback)
56.0 reasoning score
Blends available reasoning benchmarks
Best for Coding
GLM-5.3-Flash
71.5 coding index
Differences That Matter
Best value
GLM-5.3-Flash has the strongest quality-to-price mix at 100.0 out of 100 value points.
Price gap
GLM-5.3-Flash is 13.3x cheaper on input tokens than Claude Sonnet 5.5 (Max, Default Fallback).
Speed gap
Claude Sonnet 5.5 (Max, Default Fallback) generates about 1.8x as many tokens per second as GLM-5.3-Flash.
Reasoning gap
Claude Sonnet 5.5 (Max, Default Fallback) leads GLM-5.3-Flash by 14.2 points on reasoning.
Top-pick rationale
GLM-5.3-Flash wins 6 measurable categories, including Value, Input price, Output price, Blended price.
Response Face-Off
Run one prompt through the selected models and compare response quality with live speed and cost context.
GLM-5.3-Flash
Z AI
TTFT
—
Time
—
tok/s
—
Tokens
—
Cost
—
Claude Sonnet 5.5 (Max, Default Fallback)
Anthropic
TTFT
—
Time
—
tok/s
—
Tokens
—
Cost
—
Which answer was more useful?
Secure AI Chat made in Europe
Use open-weight models like DeepSeek, Qwen and Kimi in one app.
EU-hosted open models, one API
Servers in Germany & Finland. Operated by a German company under the GDPR, DPA available, ISO 27001-certified data centres.
Full Comparison
| Metric | Top Pick Z GLM-5.3-Flash | An Claude Sonnet 5.5 (Max, Default Fallback) |
|---|---|---|
| Pricing per 1M tokens | ||
| Input Cost | $0.15/1M | $2.00/1M |
| Output Cost | $0.50/1M | $10.00/1M |
| Blended (3:1) | $0.24/1M | $4.00/1M |
| Specifications | ||
| Organization | Z AI | Anthropic |
| Release Date | Aug 26, 2026 | Sep 28, 2026 |
| Performance & Speed | ||
| Throughput | 77.8 tok/s | 140.1 tok/s |
| TTFT | 2720ms | 455030ms |
| Latency | 28420ms | 455030ms |
| Composite Indices | ||
| Value Score | 100.0 | 8.0 |
| Reasoning Score | 41.8 | 56.0 |
| Intelligence | 41.8 | 56.0 |
| Coding | 71.5 | — |
Key Takeaways
GLM-5.3-Flash offers the best value at $0.15/1M,making it ideal for high-volume applications and cost-conscious projects.
Claude Sonnet 5.5 (Max, Default Fallback) has the strongest reasoning profile with a 56.0 reasoning score,combining the available reasoning-heavy benchmarks.
GLM-5.3-Flash reaches a 71.5 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-5.3-Flash
- Cost-sensitive applications
- High-volume processing
- Code generation
- Software development
Claude Sonnet 5.5 (Max, Default Fallback)
- Complex reasoning tasks
- Research & analysis
Recommended Comparisons
Popular alternatives
