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Claude Opus 4 vs GLM-4.5-Air

Claude Opus 4 and GLM-4.5-Air are closely matched at 27.8 and 24.6 on the LLM Stats Score.

Anthropic · Zhipu AI · Updated for 2026

Which is better?

Claude Opus 4 and GLM-4.5-Air are closely matched on the overall LLM Stats Score at 27.8 and 24.6.

In the 5 individual benchmarks reported for both models, Claude Opus 4 wins 4; 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 Claude Opus 4

  • you value its reported benchmark strengths — it wins 4 of 5 exact shared results

Choose GLM-4.5-Air

  • you want the most recent training data — it shipped Jul 2025
  • you need open weights you can self-host or fine-tune

At a glance

The differences that matter most.

Claude Opus 4
Anthropic
GLM-4.5-Air
Zhipu AI
Core performance indexes
LLM Stats Score
27.8
#130
24.6
#153
Reasoning
27.8
#123
24.0
#151
Coding
17.8
#110
11.6
#148
Agents
8.4
#123
6.1
#134
Cost, coverage & limits
Benchmark wins
4 of 5
1 of 5
Input price
$15.00 / M
— / M
Output price
$75.00 / M
— / M
Context window
200,000
—

Capability indexes

Additional strengths measured across groups of related public benchmarks

3 shared
Index
Claude Opus 4
GLM-4.5-Air
Math
20.0#153
22.7#128
Tool use
19.4#58
20.3#55
Writing
19.9#18
19.3#20
Conservative TrueSkill rating · higher is betterHow scores work

Individual benchmarks

9 reported for Claude Opus 4 · 14 for GLM-4.5-Air

5 shared

Claude Opus 4 outperforms in 4 benchmarks (GPQA, SWE-Bench Verified, TAU-bench Retail, Terminal-Bench), while GLM-4.5-Air is better at 1 benchmark (TAU-bench Airline).

Claude Opus 4 significantly outperforms across most benchmarks.

Fri Sep 04 2026 • llm-stats.com

Human preference

Blind head-to-head votes and playground preference scores

Context Window

Maximum input and output token capacity

Only Claude Opus 4 specifies input context (200,000 tokens). Only Claude Opus 4 specifies output context (32,000 tokens).

Anthropic
Claude Opus 4
Input200,000 tokens
Output32,000 tokens
Zhipu AI
GLM-4.5-Air
Input- tokens
Output- tokens
Fri Sep 04 2026 • llm-stats.com

Input capabilities

Documented input modalities across available providers

Claude Opus 4 supports multimodal inputs, whereas GLM-4.5-Air does not.

Claude Opus 4 can handle both text and other forms of data like images, making it suitable for multimodal applications.

Claude Opus 4

Text
Images
Audio
Video

GLM-4.5-Air

Text
Images
Audio
Video

License

Usage and distribution terms

Claude Opus 4 is licensed under a proprietary license, while GLM-4.5-Air uses MIT.

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

Claude Opus 4

Proprietary

Closed source

GLM-4.5-Air

MIT

Open weights

Release Timeline

When each model was launched

Claude Opus 4 was released on 2025-05-22, while GLM-4.5-Air was released on 2025-07-28.

GLM-4.5-Air is 2 months newer than Claude Opus 4.

Claude Opus 4

May 22, 2025

1.3 years ago

GLM-4.5-Air

Jul 28, 2025

1.1 years ago

2mo newer

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

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Judge for yourself.

Run your own prompts against Claude Opus 4 and GLM-4.5-Air side-by-side, then vote on the output you prefer.

Claude Opus 4
✓ Preferred
GLM-4.5-Air
Open in Playground

FAQ

Common questions about Claude Opus 4 vs GLM-4.5-Air.

Which is better, Claude Opus 4 or GLM-4.5-Air?

Claude Opus 4 and GLM-4.5-Air are closely matched on the LLM Stats Score at 27.8 and 24.6. Claude Opus 4 is made by Anthropic and GLM-4.5-Air is made by Zhipu AI. The best choice depends on your use case — compare their capability indexes, individual benchmarks, pricing, and limits above.

How does Claude Opus 4 compare to GLM-4.5-Air in benchmarks?

Claude Opus 4 scores MMMLU: 88.8%, TAU-bench Retail: 81.4%, GPQA: 79.6%, MMMU (validation): 76.5%, AIME 2025: 75.5%. 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%.

What are the context window sizes for Claude Opus 4 and GLM-4.5-Air?

Claude Opus 4 supports 200K tokens and GLM-4.5-Air supports an unknown number of tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

What are the main differences between Claude Opus 4 and GLM-4.5-Air?

Key differences include LLM Stats Score (27.8 vs 24.6), multimodal support (yes vs no), licensing (Proprietary vs MIT). See the full comparison above for benchmark-by-benchmark results.

Who makes Claude Opus 4 and GLM-4.5-Air?

Claude Opus 4 is developed by Anthropic and GLM-4.5-Air is developed by Zhipu AI.

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