Gemini 3 Flash vs GLM-5.3: Specs & Benchmark Comparison
Gemini 3 Flash is developed by Google, while GLM-5.3 comes from Zhipu AI. Gemini 3 Flash was released in December 2025, and GLM-5.3 followed 8 months later in August 2026. GLM-5.3 has a published size of about 753 billion parameters; Google has not disclosed the parameter count of Gemini 3 Flash.
The two models share 2 published benchmarks. GLM-5.3 leads on 2 of them. The widest gaps are on Toolathlon, where GLM-5.3 scores 73.0% against 49.4%; Humanity's Last Exam, where GLM-5.3 scores 62.5% against 43.5%. Averaged across everything we track, Gemini 3 Flash sits at 63.0% and GLM-5.3 at 52.2%.
Gemini 3 Flash is the cheaper API at $0.50 per million input tokens and $3 per million output tokens, roughly 3 times cheaper than GLM-5.3 at $1.40 and $4.40. Both accept a context window of about 1M tokens. Gemini 3 Flash accepts text, images, audio, and video as input, while GLM-5.3 accepts text.
| Characteristic | Gemini 3 Flash | GLM-5.3 |
|---|---|---|
| Company | Zhipu AI | |
| Release Date | December 16, 2025 | August 14, 2026 |
| Parameters | — | 753B |
| Multimodal | Yes | No |
| Context (input) | 1.0M | 1.0M |
| Context (output) | 66K | 131K |
| Input Price / 1M | $0.50 | $1.40 |
| Output Price / 1M | $3.00 | $4.40 |
| Average Score | 63.0% | 52.2% |
| Benchmarks | ||
| Toolathlon | 49.4% | 73.0% |
| Humanity's Last Exam | 43.5% | 62.5% |
Visual Benchmark Comparison
Verdict
Both models show equal results — the choice depends on your specific use case.
Both models show comparable average scores: Gemini 3 Flash — 0.6, GLM-5.3 — 0.5.
Gemini 3 Flash is 1.7x cheaper: input $0.50/1M vs $1.40/1M tokens.
Same context size: 1M tokens.
GLM-5.3 is newer: released 8/14/2026 vs 12/16/2025.
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Frequently Asked Questions
Which is better for coding — Gemini 3 Flash or GLM-5.3?
Which model is cheaper — Gemini 3 Flash or GLM-5.3?
Which has a larger context window — Gemini 3 Flash or GLM-5.3?
The Gemini 3 Flash and GLM-5.3 comparison is updated for 2026. Data includes benchmark results, API pricing, context window size and other specifications. For more detailed information, visit the Gemini 3 Flash or GLM-5.3 page. See also the complete list of AI model comparisons.