Model Comparison
GLM-5.3-Flash
vs. Claude Opus 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 Opus 5.5 (Max, Default Fallback)
57.6 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 26.7x cheaper on input tokens than Claude Opus 5.5 (Max, Default Fallback).
Speed gap
Claude Opus 5.5 (Max, Default Fallback) generates about 1.3x as many tokens per second as GLM-5.3-Flash.
Reasoning gap
Claude Opus 5.5 (Max, Default Fallback) leads GLM-5.3-Flash by 15.8 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
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Time
—
tok/s
—
Tokens
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Cost
—
Claude Opus 5.5 (Max, Default Fallback)
Anthropic
TTFT
—
Time
—
tok/s
—
Tokens
—
Cost
—
Which answer was more useful?
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Full Comparison
| Metric | Top Pick Z GLM-5.3-Flash | An Claude Opus 5.5 (Max, Default Fallback) |
|---|---|---|
| Pricing per 1M tokens | ||
| Input Cost | $0.15/1M | $4.00/1M |
| Output Cost | $0.50/1M | $20.00/1M |
| Blended (3:1) | $0.24/1M | $8.00/1M |
| Specifications | ||
| Organization | Z AI | Anthropic |
| Release Date | Aug 26, 2026 | Sep 22, 2026 |
| Performance & Speed | ||
| Throughput | 77.8 tok/s | 98.4 tok/s |
| TTFT | 2720ms | 700160ms |
| Latency | 28420ms | 700160ms |
| Composite Indices | ||
| Value Score | 100.0 | 4.1 |
| Reasoning Score | 41.8 | 57.6 |
| Intelligence | 41.8 | 57.6 |
| 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 Opus 5.5 (Max, Default Fallback) has the strongest reasoning profile with a 57.6 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 Opus 5.5 (Max, Default Fallback)
- Complex reasoning tasks
- Research & analysis
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