GLM-5.3 Flash vs Grok 4.5: Specs & Benchmark Comparison
GLM-5.3 Flash is developed by Zhipu AI, while Grok 4.5 comes from xAI. Grok 4.5 was released in July 2026, and GLM-5.3 Flash followed a month later in August 2026. GLM-5.3 Flash has a published size of about 320 billion parameters; xAI has not disclosed the parameter count of Grok 4.5.
The two models share 3 published benchmarks. GLM-5.3 Flash leads on 3 of them. The widest gaps are on DeepSWE 1.1, where GLM-5.3 Flash scores 63.4% against 54.0%; Artificial Analysis, where GLM-5.3 Flash scores 57.0% against 54.0%. Averaged across everything we track, GLM-5.3 Flash sits at 64.1% and Grok 4.5 at 52.9%.
GLM-5.3 Flash is the cheaper API at $0.15 per million input tokens and $0.50 per million output tokens, roughly 13 times cheaper than Grok 4.5 at $2 and $6. GLM-5.3 Flash takes the larger context window at 1M tokens, compared with 500K for Grok 4.5. GLM-5.3 Flash accepts text, images, and video as input, while Grok 4.5 accepts text and images.
| Characteristic | GLM-5.3 Flash | Grok 4.5 |
|---|---|---|
| Company | Zhipu AI | xAI |
| Release Date | August 26, 2026 | July 16, 2026 |
| Parameters | 320B | — |
| Multimodal | Yes | Yes |
| Context (input) | 1.0M | 500K |
| Context (output) | 131K | — |
| Input Price / 1M | $0.15 | $2.00 |
| Output Price / 1M | $0.50 | $6.00 |
| Average Score | 64.1% | 52.9% |
| Benchmarks | ||
| DeepSWE 1.1 | 63.4% | 54.0% |
| Artificial Analysis | 57.0% | 54.0% |
| Terminal-Bench 2.1 | 84.3% | 83.0% |
Visual Benchmark Comparison
Verdict
GLM-5.3 Flash leads in 3 out of 4 comparison categories.
Both models show comparable average scores: GLM-5.3 Flash — 0.6, Grok 4.5 — 0.5.
GLM-5.3 Flash is 12.3x cheaper: input $0.15/1M vs $2.00/1M tokens.
GLM-5.3 Flash supports a larger context: 1M vs 500K tokens.
GLM-5.3 Flash is newer: released 8/26/2026 vs 7/16/2026.
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Frequently Asked Questions
Which is better for coding — GLM-5.3 Flash or Grok 4.5?
Which model is cheaper — GLM-5.3 Flash or Grok 4.5?
Which has a larger context window — GLM-5.3 Flash or Grok 4.5?
The GLM-5.3 Flash and Grok 4.5 comparison is updated for 2026. Data includes benchmark results, API pricing, context window size and other specifications. For more detailed information, visit the GLM-5.3 Flash or Grok 4.5 page. See also the complete list of AI model comparisons.