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GLM-4.5-Air vs GPT-5 Codex

GPT-5 Codex leads the LLM Stats Score 26.6 to 24.4.

Zhipu AI · OpenAI · Updated for 2026

Which is better?

GPT-5 Codex leads the overall LLM Stats Score 26.6 to 24.4, ranking #152 overall.

In the 1 individual benchmarks reported for both models, GPT-5 Codex wins 1; this is a narrower head-to-head signal than the composite indexes.

Based on current LLM Stats indexes, shared benchmarks, pricing, and model metadata for 2026.

Choose GLM-4.5-Air

  • you need open weights you can self-host or fine-tune

Choose GPT-5 Codex

  • overall performance matters — it scores 26.6 and ranks #152 on LLM Stats
  • your work emphasizes reasoning and coding — it leads those capability indexes
  • you value its reported benchmark strengths — it wins 1 of 1 exact shared results
  • you want the most recent training data — it shipped Sep 2025

At a glance

The differences that matter most.

GLM-4.5-Air
Zhipu AI
GPT-5 Codex
OpenAI
Core performance indexes
LLM Stats Score
24.4
#167
26.6
#152
Reasoning
23.8
#165
26.5
#150
Coding
11.4
#159
19.3
#110
Cost, coverage & limits
Benchmark wins
0 of 1
1 of 1
Input price
— / M
— / M
Output price
— / M
— / M
Context window
—
—

Individual benchmarks

14 reported for GLM-4.5-Air · 1 for GPT-5 Codex

1 shared

GLM-4.5-Air outperforms in 0 benchmarks, while GPT-5 Codex is better at 1 benchmark (SWE-Bench Verified).

GPT-5 Codex significantly outperforms across most benchmarks.

Tue Sep 22 2026 • llm-stats.com

Human preference

Blind head-to-head votes and playground preference scores

License

Usage and distribution terms

GLM-4.5-Air is licensed under MIT, while GPT-5 Codex uses a proprietary license.

License differences may affect how you can use these models in commercial or open-source projects.

GLM-4.5-Air

MIT

Open weights

GPT-5 Codex

Proprietary

Closed source

Release Timeline

When each model was launched

GLM-4.5-Air was released on 2025-07-28, while GPT-5 Codex was released on 2025-09-15.

GPT-5 Codex is 2 months newer than GLM-4.5-Air.

GLM-4.5-Air

Jul 28, 2025

1.2 years ago

GPT-5 Codex

Sep 15, 2025

1.0 years ago

1mo newer

Knowledge Cutoff

When training data ends

GPT-5 Codex has a documented knowledge cutoff of 2024-09-30, while GLM-4.5-Air's cutoff date is not specified.

We can confirm GPT-5 Codex's training data extends to 2024-09-30, but cannot make a direct comparison without GLM-4.5-Air's cutoff date.

GLM-4.5-Air

—

GPT-5 Codex

Sep 2024

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Judge for yourself.

Run your own prompts against GLM-4.5-Air and GPT-5 Codex side-by-side, then vote on the output you prefer.

GLM-4.5-Air
✓ Preferred
GPT-5 Codex
Open in Playground

FAQ

Common questions about GLM-4.5-Air vs GPT-5 Codex.

Which is better, GLM-4.5-Air or GPT-5 Codex?

GPT-5 Codex leads the LLM Stats Score 26.6 to 24.4. GLM-4.5-Air is made by Zhipu AI and GPT-5 Codex is made by OpenAI. The best choice depends on your use case — compare their capability indexes, individual benchmarks, pricing, and limits above.

How does GLM-4.5-Air compare to GPT-5 Codex in benchmarks?

GLM-4.5-Air scores MATH-500: 98.1%, AIME 2024: 89.4%, MMLU-Pro: 81.4%, TAU-bench Retail: 77.9%, BFCL-v3: 76.4%. GPT-5 Codex scores SWE-Bench Verified: 74.5%.

What are the main differences between GLM-4.5-Air and GPT-5 Codex?

Key differences include LLM Stats Score (24.4 vs 26.6), licensing (MIT vs Proprietary). See the full comparison above for benchmark-by-benchmark results.

Who makes GLM-4.5-Air and GPT-5 Codex?

GLM-4.5-Air is developed by Zhipu AI and GPT-5 Codex is developed by OpenAI.

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