GLM-5.2 vs GLM-5.3 Flash: Specs & Benchmark Comparison
GLM-5.2 and GLM-5.3 Flash both come from Zhipu AI, GLM-5.2 was released in June 2026, and GLM-5.3 Flash followed 2 months later in August 2026. GLM-5.2 is the larger model at roughly 753 billion parameters, against 320 billion for GLM-5.3 Flash.
The two models share 5 published benchmarks. GLM-5.3 Flash leads on 5 of them. The widest gaps are on Toolathlon, where GLM-5.3 Flash scores 78.4% against 48.2%; DeepSWE 1.1, where GLM-5.3 Flash scores 63.4% against 44.0%. Averaged across everything we track, GLM-5.2 sits at 60.9% and GLM-5.3 Flash at 64.1%.
GLM-5.3 Flash is the cheaper API at $0.15 per million input tokens and $0.50 per million output tokens, roughly 9 times cheaper than GLM-5.2 at $1.40 and $4.40. Both accept a context window of about 1M tokens. GLM-5.2 accepts text as input, while GLM-5.3 Flash accepts text, images, and video.
| Characteristic | GLM-5.2 | GLM-5.3 Flash |
|---|---|---|
| Company | Zhipu AI | Zhipu AI |
| Release Date | June 16, 2026 | August 26, 2026 |
| Parameters | 753B | 320B |
| Multimodal | No | Yes |
| Context (input) | 1.0M | 1.0M |
| Context (output) | 131K | 131K |
| Input Price / 1M | $1.40 | $0.15 |
| Output Price / 1M | $4.40 | $0.50 |
| Average Score | 60.9% | 64.1% |
| Benchmarks | ||
| Toolathlon | 48.2% | 78.4% |
| DeepSWE 1.1 | 44.0% | 63.4% |
| NL2Repo | 48.9% | 56.3% |
| Terminal-Bench 2.1 | 82.7% | 84.3% |
| Humanity's Last Exam | 54.7% | 55.3% |
Visual Benchmark Comparison
Verdict
GLM-5.3 Flash leads in 2 out of 4 comparison categories.
Both models show comparable average scores: GLM-5.2 — 0.6, GLM-5.3 Flash — 0.6.
GLM-5.3 Flash is 8.9x cheaper: input $0.15/1M vs $1.40/1M tokens.
Same context size: 1M tokens.
GLM-5.3 Flash is newer: released 8/26/2026 vs 6/16/2026.
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Frequently Asked Questions
Which is better for coding — GLM-5.2 or GLM-5.3 Flash?
Which model is cheaper — GLM-5.2 or GLM-5.3 Flash?
Which has a larger context window — GLM-5.2 or GLM-5.3 Flash?
The GLM-5.2 and GLM-5.3 Flash comparison is updated for 2026. Data includes benchmark results, API pricing, context window size and other specifications. For more detailed information, visit the GLM-5.2 or GLM-5.3 Flash page. See also the complete list of AI model comparisons.