grok-4.5 vs glm-5.1
Side-by-side comparison of grok-4.5 and glm-5.1: benchmarks, pricing, context window and capabilities. Both are accessible through Requesty's unified API. grok-4.5 outperforms glm-5.1 on 5 of 5 shared benchmarks.
xAI Corp.
grok-4.5
Input / 1M
$2.00
Output / 1M
$6.00
Context
500K
Model ID
xai/grok-4.5
glm-5.1
Input / 1M
$1.40
Output / 1M
$4.40
Context
200K
Model ID
zai/glm-5.1
Benchmark comparison
Intelligence Indexreasoning
grok-4.553.8%
glm-5.140.2%
Coding Indexcoding
grok-4.572.4%
glm-5.155.8%
GPQA Diamondreasoning
grok-4.593.1%
glm-5.186.8%
Terminal-Bench Hardagentic
grok-4.5N/A
glm-5.143.2%
τ²-Benchagentic
grok-4.5N/A
glm-5.197.7%
SciCodecoding
grok-4.554.1%
glm-5.143.8%
Humanity's Last Examreasoning
grok-4.540.3%
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
| grok-4.5 | glm-5.1 | |
|---|---|---|
| Input price / 1M | $2.00 | $1.40 |
| Output price / 1M | $6.00 | $4.40 |
| Context window | 500K tokens | 200K tokens |
| Max output | N/A | 128K tokens |
| Vision input | Yes | Yes |
| Tool calling | Yes | Yes |
| Reasoning | Yes | Yes |
| Prompt caching | Yes | Yes |
| Computer use | N/A | N/A |
| Provider | xAI Corp. | Z.ai |
Questions people ask
Is grok-4.5 better than glm-5.1?
grok-4.5 outperforms glm-5.1 on 5 of 5 shared benchmarks. See the benchmark comparison above for specifics: grok-4.5 and glm-5.1 have different strengths across reasoning, coding, math and multimodal tasks.
Which is cheaper, grok-4.5 or glm-5.1?
glm-5.1 is cheaper. grok-4.5 costs $2.00/$6.00 per 1M input/output tokens, while glm-5.1 costs $1.40/$4.40.
Can I use grok-4.5 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 "xai/grok-4.5" and "zai/glm-5.1", no other code changes needed.
What are the context windows?
grok-4.5 supports up to 500K 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 grok-4.5 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.