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...
Model details →Anthropic: Claude Sonnet 4.5 vs Z.ai: GLM 5.3 Prime
Z.ai: GLM 5.3 Prime wins on 2 of 6 axes — pricing and capability skew in its favour for most workloads.
GLM-5.3-Prime is the high-speed variant of Z.ai's GLM-5.3, inheriting its full capabilities while delivering 1.5–2× the output throughput through inference acceleration. It supports text input and output with a 1M-token...
Model details →Side-by-side comparison
| Capability | Anthropic: Claude Sonnet 4.5 | Z.ai: GLM 5.3 Prime | Winner |
|---|---|---|---|
| Context window Maximum number of input tokens the model can attend to in a single request. | 1M | 1M | Tie |
| Input price (per 1M) Cost per million input tokens billed by the provider. | $3.00 | $2.80 | 🏆 Z.ai: GLM 5.3 Prime |
| Output price (per 1M) Cost per million output tokens billed by the provider. | $15.00 | $8.80 | 🏆 Z.ai: GLM 5.3 Prime |
| Tool / function calling First-class support for emitting structured tool calls. | Yes | Yes | Tie |
| Vision input Accepts image inputs alongside text. | Yes | — | 🏆 Anthropic: Claude Sonnet 4.5 |
| Reasoning mode Internal chain-of-thought / extended-thinking support. | Yes | Yes | Tie |
Frequently asked questions
Is Anthropic: Claude Sonnet 4.5 better than Z.ai: GLM 5.3 Prime?
Z.ai: GLM 5.3 Prime wins on 2 of 6 axes — pricing and capability skew in its favour for most workloads.
What's the price difference between Anthropic: Claude Sonnet 4.5 and Z.ai: GLM 5.3 Prime?
Input: $3.00 vs $2.80 per 1M tokens. Output: $15.00 vs $8.80 per 1M tokens.
What context windows do Anthropic: Claude Sonnet 4.5 and Z.ai: GLM 5.3 Prime support?
Anthropic: Claude Sonnet 4.5 supports up to 1M tokens. Z.ai: GLM 5.3 Prime supports up to 1M tokens.
Do both Anthropic: Claude Sonnet 4.5 and Z.ai: GLM 5.3 Prime support tool calling?
Anthropic: Claude Sonnet 4.5: yes. Z.ai: GLM 5.3 Prime: yes.