GLM-5.3 vs GPT-4o mini
Comparing GLM-5.3 and GPT-4o mini across benchmarks, pricing, and capabilities.
Zhipu AI · OpenAI · Updated for 2026
Which is better?
GLM-5.3 and GPT-4o mini trade strengths across price, capabilities, and technical limits. The better choice depends on the workload.
On price, GPT-4o mini is roughly 8.2x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.
GLM-5.3 also accepts a larger context window (1,000,000 input tokens), making it the stronger choice for long documents and large codebases.
Based on current benchmark, pricing, and model metadata for 2026.
Choose GLM-5.3
- you process long inputs — it offers a 1,000,000 token context window
- you want the most recent training data — it shipped Aug 2026
Choose GPT-4o mini
- cost matters — it's about 8.2x cheaper per token
At a glance
The differences that matter most.
Performance Benchmarks
Comparative analysis across standard metrics
GLM-5.3 and GPT-4o minidon't have any common benchmark datasets to compare. They may have been evaluated on different testing suites.
Arena Performance
Playground indexes and blind preference scores
Pricing Analysis
Price comparison per million tokens
For input processing, GLM-5.3 ($1.40/1M tokens) is 9.3x more expensive than GPT-4o mini ($0.15/1M tokens).
For output processing, GLM-5.3 ($4.40/1M tokens) is 7.3x more expensive than GPT-4o mini ($0.60/1M tokens).
In conclusion, GLM-5.3 is more expensive than GPT-4o mini.*
* Using a 3:1 ratio of input to output tokens
Context Window
Maximum input and output token capacity
GLM-5.3 accepts 1,000,000 input tokens compared to GPT-4o mini's 128,000 tokens. GLM-5.3 can generate longer responses up to 128,000 tokens, while GPT-4o mini is limited to 16,384 tokens.
Input Capabilities
Supported data types and modalities
GPT-4o mini supports multimodal inputs, whereas GLM-5.3 does not.
GPT-4o mini can handle both text and other forms of data like images, making it suitable for multimodal applications.
GLM-5.3
GPT-4o mini
Release Timeline
When each model was launched
GLM-5.3 was released on 2026-08-14, while GPT-4o mini was released on 2024-07-18.
GLM-5.3 is 25 months newer than GPT-4o mini.
Aug 14, 2026
1 weeks ago
2.1yr newerJul 18, 2024
2.1 years ago
Knowledge Cutoff
When training data ends
GPT-4o mini has a documented knowledge cutoff of 2023-10-01, while GLM-5.3's cutoff date is not specified.
We can confirm GPT-4o mini's training data extends to 2023-10-01, but cannot make a direct comparison without GLM-5.3's cutoff date.
—
Oct 2023
Provider Availability
GLM-5.3 is available from ZAI. GPT-4o mini is available from Azure.
GLM-5.3
GPT-4o mini
Outputs Comparison
Judge for yourself.
Run your own prompts against GLM-5.3 and GPT-4o mini side-by-side, then vote on the output you prefer.
FAQ
Common questions about GLM-5.3 vs GPT-4o mini.