claude-sonnet-5 vs glm-5.1
Side-by-side comparison of claude-sonnet-5 and glm-5.1: benchmarks, pricing, context window and capabilities. Both are accessible through Requesty's unified API. claude-sonnet-5 outperforms glm-5.1 on 5 of 5 shared benchmarks.
claude-sonnet-5
Input / 1M
$2.00
Output / 1M
$10.00
Context
1M
Model ID
anthropic/claude-sonnet-5
glm-5.1
Input / 1M
$1.40
Output / 1M
$4.40
Context
200K
Model ID
zai/glm-5.1
Benchmark comparison
Intelligence Indexreasoning
claude-sonnet-553.4%
glm-5.140.2%
Coding Indexcoding
claude-sonnet-571.5%
glm-5.155.8%
GPQA Diamondreasoning
claude-sonnet-591.1%
glm-5.186.8%
Terminal-Bench Hardagentic
claude-sonnet-5N/A
glm-5.143.2%
τ²-Benchagentic
claude-sonnet-5N/A
glm-5.197.7%
SciCodecoding
claude-sonnet-553.6%
glm-5.143.8%
Humanity's Last Examreasoning
claude-sonnet-539.6%
glm-5.128.0%
Scores sourced from official model cards, Artificial Analysis, and public leaderboards. Benchmarks measure specific skills and don't capture every aspect of model quality.
Pricing & specifications
| claude-sonnet-5 | glm-5.1 | |
|---|---|---|
| Input price / 1M | $2.00 | $1.40 |
| Output price / 1M | $10.00 | $4.40 |
| Context window | 1M tokens | 200K tokens |
| Max output | 128K tokens | 128K tokens |
| Vision input | Yes | Yes |
| Tool calling | Yes | Yes |
| Reasoning | Yes | Yes |
| Prompt caching | Yes | Yes |
| Computer use | Yes | N/A |
| Provider | Anthropic PBC | Z.ai |
Questions people ask
Is claude-sonnet-5 better than glm-5.1?
claude-sonnet-5 outperforms glm-5.1 on 5 of 5 shared benchmarks. See the benchmark comparison above for specifics: claude-sonnet-5 and glm-5.1 have different strengths across reasoning, coding, math and multimodal tasks.
Which is cheaper, claude-sonnet-5 or glm-5.1?
glm-5.1 is cheaper. claude-sonnet-5 costs $2.00/$10.00 per 1M input/output tokens, while glm-5.1 costs $1.40/$4.40.
Can I use claude-sonnet-5 and glm-5.1 through the same API?
Yes. Requesty provides a single OpenAI-compatible API that routes to both. Change just the "model" parameter to switch between "anthropic/claude-sonnet-5" and "zai/glm-5.1", no other code changes needed.
What are the context windows?
claude-sonnet-5 supports up to 1M tokens of context. glm-5.1 supports up to 200K tokens. Longer context means you can feed larger documents or codebases in a single prompt, though quality often degrades past 128K for most models.
Switch between claude-sonnet-5 and glm-5.1 with one line of code
Requesty provides a single OpenAI-compatible API for 400+ models. Change the model parameter, not your code.