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GLM-5.3 vs GPT-5.3 Chat

Comparing GLM-5.3 and GPT-5.3 Chat across benchmarks, pricing, and capabilities.

Zhipu AI · OpenAI · Updated for 2026

Which is better?

GLM-5.3 and GPT-5.3 Chat trade strengths across price, capabilities, and technical limits. The better choice depends on the workload.

On price, GLM-5.3 is roughly 2.2x 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

  • cost matters — it's about 2.2x 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-5.3 Chat

  • you want predictable pricing at $1.75/M input and $14.00/M output

At a glance

The differences that matter most.

GLM-5.3
Zhipu AI
GPT-5.3 Chat
OpenAI
Benchmark wins
—
—
Input price
$1.40 / M
$1.75 / M
Output price
$4.40 / M
$14.00 / M
Context window
1,000,000
128,000
Released
Aug 2026
Mar 2026
License
Unknown
Proprietary

Performance Benchmarks

Comparative analysis across standard metrics

No common benchmarks found

GLM-5.3 and GPT-5.3 Chatdon'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

GLM-5.3 costs less

For input processing, GLM-5.3 ($1.40/1M tokens) is 1.3x cheaper than GPT-5.3 Chat ($1.75/1M tokens).

For output processing, GLM-5.3 ($4.40/1M tokens) is 3.2x cheaper than GPT-5.3 Chat ($14.00/1M tokens).

In conclusion, GPT-5.3 Chat is more expensive than GLM-5.3.*

* Using a 3:1 ratio of input to output tokens

Lowest available price from all providers
Wed Aug 26 2026 • llm-stats.com
Zhipu AI
GLM-5.3
Input tokens$1.40
Output tokens$4.40
Best providerUnknown Organization
OpenAI
GPT-5.3 Chat
Input tokens$1.75
Output tokens$14.00
Best providerOpenAI
Notice missing or incorrect data?Start an Issue→

Context Window

Maximum input and output token capacity

GLM-5.3 accepts 1,000,000 input tokens compared to GPT-5.3 Chat's 128,000 tokens. GLM-5.3 can generate longer responses up to 131,072 tokens, while GPT-5.3 Chat is limited to 16,384 tokens.

Zhipu AI
GLM-5.3
Input1,000,000 tokens
Output131,072 tokens
OpenAI
GPT-5.3 Chat
Input128,000 tokens
Output16,384 tokens
Wed Aug 26 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

GPT-5.3 Chat supports multimodal inputs, whereas GLM-5.3 does not.

GPT-5.3 Chat can handle both text and other forms of data like images, making it suitable for multimodal applications.

GLM-5.3

Text
Images
Audio
Video

GPT-5.3 Chat

Text
Images
Audio
Video

Release Timeline

When each model was launched

GLM-5.3 was released on 2026-08-14, while GPT-5.3 Chat was released on 2026-03-04.

GLM-5.3 is 5 months newer than GPT-5.3 Chat.

GLM-5.3

Aug 14, 2026

1 weeks ago

5mo newer
GPT-5.3 Chat

Mar 4, 2026

5 months ago

Knowledge Cutoff

When training data ends

GPT-5.3 Chat has a documented knowledge cutoff of 2025-08-31, while GLM-5.3's cutoff date is not specified.

We can confirm GPT-5.3 Chat's training data extends to 2025-08-31, but cannot make a direct comparison without GLM-5.3's cutoff date.

GLM-5.3

—

GPT-5.3 Chat

Aug 2025

Provider Availability

GLM-5.3 is available from ZAI. GPT-5.3 Chat is available from OpenAI.

GLM-5.3

z logo
Unknown Organization
Input Price:Input: $1.40/1MOutput Price:Output: $4.40/1M

GPT-5.3 Chat

openai logo
OpenAI
Input Price:Input: $1.75/1MOutput Price:Output: $14.00/1M
* Prices shown are per million tokens

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Judge for yourself.

Run your own prompts against GLM-5.3 and GPT-5.3 Chat side-by-side, then vote on the output you prefer.

GLM-5.3
✓ Preferred
GPT-5.3 Chat
Open in Playground

FAQ

Common questions about GLM-5.3 vs GPT-5.3 Chat.

Which is better, GLM-5.3 or GPT-5.3 Chat?

GLM-5.3 (Zhipu AI) and GPT-5.3 Chat (OpenAI) each have strengths in different areas. Compare their benchmark scores, pricing, context windows, and capabilities above to determine which fits your needs.

How does GLM-5.3 compare to GPT-5.3 Chat in benchmarks?

GLM-5.3 scores Terminal-Bench 2.1: 88.2%, CyberGym: 84.5%, FrontierSWE: 78.1%, Toolathlon: 73.0%, DeepSWE 1.1: 66.9%. GPT-5.3 Chat scores HealthBench: 54.1%, HealthBench Hard: 25.9%.

Is GLM-5.3 cheaper than GPT-5.3 Chat?

GLM-5.3 is 1.3x cheaper for input tokens. GLM-5.3 costs $1.40/M input and $4.40/M output via z. GPT-5.3 Chat costs $1.75/M input and $14.00/M output via openai.

What are the context window sizes for GLM-5.3 and GPT-5.3 Chat?

GLM-5.3 supports 1.0M tokens and GPT-5.3 Chat supports 128K tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

What are the main differences between GLM-5.3 and GPT-5.3 Chat?

Key differences include context window (1.0M vs 128K), input pricing ($1.40 vs $1.75/M), multimodal support (no vs yes), licensing (Unknown vs Proprietary). See the full comparison above for benchmark-by-benchmark results.

Who makes GLM-5.3 and GPT-5.3 Chat?

GLM-5.3 is developed by Zhipu AI and GPT-5.3 Chat is developed by OpenAI.

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