GLM-4.5 vs Grok 4 Fast: Specs & Benchmark Comparison
| Characteristic | GLM-4.5 | Grok 4 Fast |
|---|---|---|
| Company | Zhipu AI | xAI |
| Release Date | July 27, 2025 | August 27, 2025 |
| Parameters | 355B | — |
| Multimodal | No | Yes |
| Context (input) | 131K | 2.0M |
| Context (output) | 98K | 30K |
| Input Price / 1M | $0.60 | $0.20 |
| Output Price / 1M | $2.20 | $0.50 |
| Average Score | 0.8 | 0.8 |
| Benchmarks | ||
| LiveCodeBench | 0.7 | 0.8 |
| GPQA | 0.8 | 0.9 |
Visual Benchmark Comparison
GLM-4.5
Grok 4 Fast
LiveCodeBench0.7 vs 0.8
0.7
0.8
GPQA0.8 vs 0.9
0.8
0.9
Verdict
Grok 4 Fast leads in 3 out of 4 comparison categories.
Overall Performance
Both models show comparable average scores: GLM-4.5 — 0.8, Grok 4 Fast — 0.8.
API Cost
Grok 4 Fast is 4.0x cheaper: input $0.20/1M vs $0.60/1M tokens.
Context Window
Grok 4 Fast supports a larger context: 2M vs 131K tokens.
Recency
Grok 4 Fast is newer: released 8/27/2025 vs 7/27/2025.
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Frequently Asked Questions
Which is better for coding — GLM-4.5 or Grok 4 Fast?
Direct comparison on the SWE-Bench benchmark is not available. We recommend reviewing other metrics on the comparison page.
Which model is cheaper — GLM-4.5 or Grok 4 Fast?
Grok 4 Fast is cheaper for input: $0.20 per 1M tokens vs $0.60.
Which has a larger context window — GLM-4.5 or Grok 4 Fast?
Grok 4 Fast supports a larger context: 2,000,000 tokens vs 131,072.
The GLM-4.5 and Grok 4 Fast comparison is updated for 2026. Data includes benchmark results, API pricing, context window size and other specifications. For more detailed information, visit the GLM-4.5 or Grok 4 Fast page. See also the complete list of AI model comparisons.