Claude Sonnet 4.5 vs GLM 4.5 Air
How do these models stack up? Below is an expert side-by-side comparison of specifications, context window capacity, live pricing per million tokens, and standardized benchmark scores for Claude Sonnet 4.5 and GLM 4.5 Air.
Claude Sonnet 4.5
Claude Sonnet 4.5 is Anthropic’s most advanced Sonnet model to date, optimized for real-world agents and coding workflows. It delivers state-of-the-art performance on coding benchmarks such as SWE-bench Verified, with...
GLM 4.5 Air
GLM-4.5-Air is the lightweight variant of our latest flagship model family, also purpose-built for agent-centric applications. Like GLM-4.5, it adopts the Mixture-of-Experts (MoE) architecture but with a more compact parameter...
Technical Specifications
| Specification | Claude Sonnet 4.5 | GLM 4.5 Air |
|---|---|---|
| Provider | Anthropic | Zhipu AI |
| Context Window | 1,000,000 tokens | 131,072 tokens |
| Agent Suitability | 91/100 | N/A |
| Time to First Token (TTFT) | 380 ms | N/A |
| Deployment Model | managed api | managed api |
| Production Stability | stable | stable |
| API Available | Yes | Yes |
| Released Date | 2025-09-29 | 2025-07-25 |
API Pricing Comparison
Input Price per Million Tokens
Claude Sonnet 4.5
$3.00
GLM 4.5 Air
$0.13
Output Price per Million Tokens
Claude Sonnet 4.5
$15.00
GLM 4.5 Air
$0.85
Want to test both models live?
Run side-by-side prompt prompts in our dynamic Sandbox. Check execution speeds, latency metrics, and compute actual costs in real-time.
Benchmark Performance Metrics
Scores show the raw performance percentages verified across key evaluation suites. Higher bars indicate superior accuracy and capability in that domain.
Claude Sonnet 4.5 Quirks & Gotchas
- ▸Excellent for long-form writing and nuanced document analysis
- ▸Slightly slower than Sonnet 4.6 — upgrade for production agentic use
GLM 4.5 Air Quirks & Gotchas
No developer gotchas reported.