GLM-5.3 vs GPT-4o
Comparing GLM-5.3 and GPT-4o across benchmarks, pricing, and capabilities.
Zhipu AI · OpenAI · Updated for 2026
Which is better?
GLM-5.3 and GPT-4o trade strengths across price, capabilities, and technical limits. The better choice depends on the workload.
On price, GLM-5.3 is roughly 2.0x 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
- cost matters — it's about 2.0x cheaper per token
- 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
- you want predictable pricing at $2.50/M input and $10.00/M output
At a glance
The differences that matter most.
Performance Benchmarks
Comparative analysis across standard metrics
GLM-5.3 and GPT-4odon'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 1.8x cheaper than GPT-4o ($2.50/1M tokens).
For output processing, GLM-5.3 ($4.40/1M tokens) is 2.3x cheaper than GPT-4o ($10.00/1M tokens).
In conclusion, GPT-4o is more expensive than GLM-5.3.*
* 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's 128,000 tokens. GLM-5.3 can generate longer responses up to 128,000 tokens, while GPT-4o is limited to 4,096 tokens.
Input Capabilities
Supported data types and modalities
GPT-4o supports multimodal inputs, whereas GLM-5.3 does not.
GPT-4o can handle both text and other forms of data like images, making it suitable for multimodal applications.
GLM-5.3
GPT-4o
Release Timeline
When each model was launched
GLM-5.3 was released on 2026-08-14, while GPT-4o was released on 2024-05-13.
GLM-5.3 is 27 months newer than GPT-4o.
Aug 14, 2026
1 weeks ago
2.3yr newerMay 13, 2024
2.3 years ago
Knowledge Cutoff
When training data ends
Neither model specifies a knowledge cutoff date.
Unable to compare the recency of their training data.
Provider Availability
GLM-5.3 is available from ZAI. GPT-4o is available from Azure, OpenAI.
GLM-5.3
GPT-4o
Outputs Comparison
Judge for yourself.
Run your own prompts against GLM-5.3 and GPT-4o side-by-side, then vote on the output you prefer.
FAQ
Common questions about GLM-5.3 vs GPT-4o.