grok-4 vs GLM-5.1
Side-by-side comparison of grok-4 and GLM-5.1: benchmarks, pricing, context window and capabilities. Both are accessible through Requesty's unified API. GLM-5.1 outperforms grok-4 on 5 of 7 shared benchmarks.
xAI Corp.
grok-4
Input / 1M
$3.00
Output / 1M
$15.00
Context
256K
Model ID
xai/grok-4
GLM-5.1
Input / 1M
$1.40
Output / 1M
$4.40
Context
200K
Model ID
zai/GLM-5.1
Benchmark comparison
Intelligence Indexreasoning
grok-441.5%
GLM-5.151.4%
Coding Indexcoding
grok-440.5%
GLM-5.143.4%
Math Indexmath
grok-492.7%
GLM-5.1N/A
GPQA Diamondreasoning
grok-487.7%
GLM-5.186.8%
AIME 2025math
grok-492.7%
GLM-5.1N/A
LiveCodeBenchcoding
grok-481.9%
GLM-5.1N/A
Terminal-Bench Hardagentic
grok-437.9%
GLM-5.143.2%
τ²-Benchagentic
grok-474.9%
GLM-5.197.7%
SciCodecoding
grok-445.7%
GLM-5.143.8%
MMLU Proknowledge
grok-486.6%
GLM-5.1N/A
Humanity's Last Examreasoning
grok-423.9%
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 | GLM-5.1 | |
|---|---|---|
| Input price / 1M | $3.00 | $1.40 |
| Output price / 1M | $15.00 | $4.40 |
| Context window | 256K tokens | 200K tokens |
| Max output | N/A | 128K tokens |
| Vision input | Yes | Yes |
| Tool calling | Yes | Yes |
| Reasoning | N/A | Yes |
| Prompt caching | Yes | Yes |
| Computer use | Yes | N/A |
| Provider | xAI Corp. | Z.ai |
Questions people ask
Is grok-4 better than GLM-5.1?
GLM-5.1 outperforms grok-4 on 5 of 7 shared benchmarks. See the benchmark comparison above for specifics: grok-4 and GLM-5.1 have different strengths across reasoning, coding, math and multimodal tasks.
Which is cheaper, grok-4 or GLM-5.1?
GLM-5.1 is cheaper. grok-4 costs $3.00/$15.00 per 1M input/output tokens, while GLM-5.1 costs $1.40/$4.40.
Can I use grok-4 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" and "zai/GLM-5.1", no other code changes needed.
What are the context windows?
grok-4 supports up to 256K 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 and GLM-5.1 with one line of code
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