Gemini 2.5 Pro vs GLM-5.3-Flash
GLM-5.3-Flash significantly outperforms across most benchmarks. GLM-5.3-Flash is 14.5x cheaper per token.
Google · Zhipu AI · Updated for 2026
Which is better?
Gemini 2.5 Pro outperforms in 0 benchmarks, while GLM-5.3-Flash is better at 1 benchmark (Humanity's Last Exam). GLM-5.3-Flash significantly outperforms across most benchmarks.
On price, GLM-5.3-Flash is roughly 14.5x 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 2.5 Pro
- you want predictable pricing at $1.25/M input and $10.00/M output
Choose GLM-5.3-Flash
- you want the strongest raw capability — it leads on 1 of 1 shared benchmarks
- cost matters — it's about 14.5x 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 2.5 Pro outperforms in 0 benchmarks, while GLM-5.3-Flash is better at 1 benchmark (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 2.5 Pro ($1.25/1M tokens) is 8.3x more expensive than GLM-5.3-Flash ($0.15/1M tokens).
For output processing, Gemini 2.5 Pro ($10.00/1M tokens) is 20.0x more expensive than GLM-5.3-Flash ($0.50/1M tokens).
In conclusion, Gemini 2.5 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 2.5 Pro is limited to 65,536 tokens.
Input Capabilities
Supported data types and modalities
Both Gemini 2.5 Pro and GLM-5.3-Flash support multimodal inputs.
They are both capable of processing various types of data, offering versatility in application.
Gemini 2.5 Pro
GLM-5.3-Flash
License
Usage and distribution terms
Gemini 2.5 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 2.5 Pro was released on 2025-05-20, while GLM-5.3-Flash was released on 2026-08-26.
GLM-5.3-Flash is 15 months newer than Gemini 2.5 Pro.
May 20, 2025
1.3 years ago
Aug 26, 2026
0 days ago
1.3yr newerKnowledge Cutoff
When training data ends
Gemini 2.5 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 2.5 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 2.5 Pro is available from Google. GLM-5.3-Flash is available from DeepInfra, Novita, ZAI.
Gemini 2.5 Pro
GLM-5.3-Flash
Outputs Comparison
Judge for yourself.
Run your own prompts against Gemini 2.5 Pro and GLM-5.3-Flash side-by-side, then vote on the output you prefer.
FAQ
Common questions about Gemini 2.5 Pro vs GLM-5.3-Flash.