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GLM-5.3 vs GPT-5.1 Codex Mini

Comparing GLM-5.3 and GPT-5.1 Codex Mini across benchmarks, pricing, and capabilities.

Zhipu AI · OpenAI · Updated for 2026

Which is better?

GLM-5.3 and GPT-5.1 Codex Mini trade strengths across price, capabilities, and technical limits. The better choice depends on the workload.

On price, GPT-5.1 Codex Mini is roughly 3.1x 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-5.1 Codex Mini

  • cost matters — it's about 3.1x cheaper per token

At a glance

The differences that matter most.

GLM-5.3
Zhipu AI
GPT-5.1 Codex Mini
OpenAI
Benchmark wins
—
—
Input price
$1.40 / M
$0.25 / M
Output price
$4.40 / M
$2.00 / M
Context window
1,000,000
400,000
Released
Aug 2026
Nov 2025
License
Unknown
Proprietary

Performance Benchmarks

Comparative analysis across standard metrics

No common benchmarks found

GLM-5.3 and GPT-5.1 Codex 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

GPT-5.1 Codex Mini costs less

For input processing, GLM-5.3 ($1.40/1M tokens) is 5.6x more expensive than GPT-5.1 Codex Mini ($0.25/1M tokens).

For output processing, GLM-5.3 ($4.40/1M tokens) is 2.2x more expensive than GPT-5.1 Codex Mini ($2.00/1M tokens).

In conclusion, GLM-5.3 is more expensive than GPT-5.1 Codex Mini.*

* 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-5.1 Codex Mini
Input tokens$0.25
Output tokens$2.00
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-5.1 Codex Mini's 400,000 tokens. Both models can generate responses up to 128,000 tokens.

Zhipu AI
GLM-5.3
Input1,000,000 tokens
Output128,000 tokens
OpenAI
GPT-5.1 Codex Mini
Input400,000 tokens
Output128,000 tokens
Wed Aug 26 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

GPT-5.1 Codex Mini supports multimodal inputs, whereas GLM-5.3 does not.

GPT-5.1 Codex Mini 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-5.1 Codex Mini

Text
Images
Audio
Video

Release Timeline

When each model was launched

GLM-5.3 was released on 2026-08-14, while GPT-5.1 Codex Mini was released on 2025-11-12.

GLM-5.3 is 9 months newer than GPT-5.1 Codex Mini.

GLM-5.3

Aug 14, 2026

1 weeks ago

9mo newer
GPT-5.1 Codex Mini

Nov 12, 2025

9 months ago

Knowledge Cutoff

When training data ends

Neither model specifies a knowledge cutoff date.

Unable to compare the recency of their training data.

No cutoff dates available

Provider Availability

GLM-5.3 is available from ZAI. GPT-5.1 Codex Mini is available from OpenAI.

GLM-5.3

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

GPT-5.1 Codex Mini

openai logo
OpenAI
Input Price:Input: $0.25/1MOutput Price:Output: $2.00/1M
* 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-5.1 Codex Mini side-by-side, then vote on the output you prefer.

GLM-5.3
✓ Preferred
GPT-5.1 Codex Mini
Open in Playground

FAQ

Common questions about GLM-5.3 vs GPT-5.1 Codex Mini.

Which is better, GLM-5.3 or GPT-5.1 Codex Mini?

GLM-5.3 (Zhipu AI) and GPT-5.1 Codex Mini (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-5.1 Codex Mini 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-5.1 Codex Mini scores AIME 2025: 42.1%.

Is GLM-5.3 cheaper than GPT-5.1 Codex Mini?

GPT-5.1 Codex Mini is 5.6x cheaper for input tokens. GLM-5.3 costs $1.40/M input and $4.40/M output via z. GPT-5.1 Codex Mini costs $0.25/M input and $2.00/M output via openai.

What are the context window sizes for GLM-5.3 and GPT-5.1 Codex Mini?

GLM-5.3 supports 1.0M tokens and GPT-5.1 Codex Mini supports 400K 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-5.1 Codex Mini?

Key differences include context window (1.0M vs 400K), input pricing ($1.40 vs $0.25/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-5.1 Codex Mini?

GLM-5.3 is developed by Zhipu AI and GPT-5.1 Codex Mini is developed by OpenAI.

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