Gemini 3 Pro vs GLM-5.3-Flash
GLM-5.3-Flash significantly outperforms across most benchmarks. GLM-5.3-Flash is 18.9x cheaper per token.
Google · Zhipu AI · Updated for 2026
Which is better?
Gemini 3 Pro outperforms in 0 benchmarks, while GLM-5.3-Flash is better at 2 benchmarks (CharXiv-R, Humanity's Last Exam). GLM-5.3-Flash significantly outperforms across most benchmarks.
On price, GLM-5.3-Flash is roughly 18.9x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.
Based on current benchmark, pricing, and model metadata for 2026.
Choose Gemini 3 Pro
- you want predictable pricing at $2.00/M input and $12.00/M output
Choose GLM-5.3-Flash
- you want the strongest raw capability — it leads on 2 of 2 shared benchmarks
- cost matters — it's about 18.9x cheaper per token
- you want the most recent training data — it shipped Aug 2026
- you need open weights you can self-host or fine-tune
At a glance
The differences that matter most.
Performance Benchmarks
Comparative analysis across standard metrics
Gemini 3 Pro outperforms in 0 benchmarks, while GLM-5.3-Flash is better at 2 benchmarks (CharXiv-R, Humanity's Last Exam).
GLM-5.3-Flash significantly outperforms across most benchmarks.
Arena Performance
Playground indexes and blind preference scores
Pricing Analysis
Price comparison per million tokens
For input processing, Gemini 3 Pro ($2.00/1M tokens) is 13.3x more expensive than GLM-5.3-Flash ($0.15/1M tokens).
For output processing, Gemini 3 Pro ($12.00/1M tokens) is 24.0x more expensive than GLM-5.3-Flash ($0.50/1M tokens).
In conclusion, Gemini 3 Pro is more expensive than GLM-5.3-Flash.*
* Using a 3:1 ratio of input to output tokens
Context Window
Maximum input and output token capacity
Both models have the same input context window of 1,048,576 tokens. GLM-5.3-Flash can generate longer responses up to 131,072 tokens, while Gemini 3 Pro is limited to 65,536 tokens.
Input Capabilities
Supported data types and modalities
Both Gemini 3 Pro and GLM-5.3-Flash support multimodal inputs.
They are both capable of processing various types of data, offering versatility in application.
Gemini 3 Pro
GLM-5.3-Flash
License
Usage and distribution terms
Gemini 3 Pro is licensed under a proprietary license, while GLM-5.3-Flash uses MIT.
License differences may affect how you can use these models in commercial or open-source projects.
Proprietary
Closed source
MIT
Open weights
Release Timeline
When each model was launched
Gemini 3 Pro was released on 2025-11-18, while GLM-5.3-Flash was released on 2026-08-26.
GLM-5.3-Flash is 9 months newer than Gemini 3 Pro.
Nov 18, 2025
9 months ago
Aug 26, 2026
0 days ago
9mo newerKnowledge Cutoff
When training data ends
Gemini 3 Pro has a documented knowledge cutoff of 2025-01-31, while GLM-5.3-Flash's cutoff date is not specified.
We can confirm Gemini 3 Pro's training data extends to 2025-01-31, but cannot make a direct comparison without GLM-5.3-Flash's cutoff date.
Jan 2025
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Provider Availability
Gemini 3 Pro is available from Google. GLM-5.3-Flash is available from DeepInfra, Novita, ZAI.
Gemini 3 Pro
GLM-5.3-Flash
Outputs Comparison
Judge for yourself.
Run your own prompts against Gemini 3 Pro and GLM-5.3-Flash side-by-side, then vote on the output you prefer.
FAQ
Common questions about Gemini 3 Pro vs GLM-5.3-Flash.