Model Comparison

Claude Opus 4.5 vs GLM-4.5-AirWhich is better in 2026?

Claude Opus 4.5 significantly outperforms across most benchmarks.

Verdict: Claude Opus 4.5 vs GLM-4.5-Air — which is better?

Claude Opus 4.5 (by Anthropic) and GLM-4.5-Air (by Zhipu AI) are two of the AI models people compare most. Here is how they stack up on benchmarks, price and capabilities, and which one to pick in 2026.

Claude Opus 4.5 outperforms in 2 benchmarks (GPQA, SWE-Bench Verified), while GLM-4.5-Air is better at 0 benchmarks. Claude Opus 4.5 significantly outperforms across most benchmarks.

Choose Claude Opus 4.5 if…

  • you want the strongest raw capability — it leads on 2 of 2 shared benchmarks
  • you want the most recent training data — it shipped Nov 2025

Choose GLM-4.5-Air if…

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

Performance Benchmarks

Comparative analysis across standard metrics

2 benchmarks

Claude Opus 4.5 outperforms in 2 benchmarks (GPQA, SWE-Bench Verified), while GLM-4.5-Air is better at 0 benchmarks.

Claude Opus 4.5 significantly outperforms across most benchmarks.

Tue Jul 14 2026 • llm-stats.com

Arena Performance

Human preference votes

Context Window

Maximum input and output token capacity

Only Claude Opus 4.5 specifies input context (200,000 tokens). Only Claude Opus 4.5 specifies output context (64,000 tokens).

Anthropic
Claude Opus 4.5
Input200,000 tokens
Output64,000 tokens
Zhipu AI
GLM-4.5-Air
Input- tokens
Output- tokens
Tue Jul 14 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

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

Claude Opus 4.5 can handle both text and other forms of data like images, making it suitable for multimodal applications.

Claude Opus 4.5

Text
Images
Audio
Video

GLM-4.5-Air

Text
Images
Audio
Video

License

Usage and distribution terms

Claude Opus 4.5 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 4.5

Proprietary

Closed source

GLM-4.5-Air

MIT

Open weights

Release Timeline

When each model was launched

Claude Opus 4.5 was released on 2025-11-24, while GLM-4.5-Air was released on 2025-07-28.

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

Claude Opus 4.5

Nov 24, 2025

7 months ago

3mo newer
GLM-4.5-Air

Jul 28, 2025

11 months ago

Knowledge Cutoff

When training data ends

Claude Opus 4.5 has a documented knowledge cutoff of 2025-03-31, while GLM-4.5-Air's cutoff date is not specified.

We can confirm Claude Opus 4.5's training data extends to 2025-03-31, but cannot make a direct comparison without GLM-4.5-Air's cutoff date.

Claude Opus 4.5

Mar 2025

GLM-4.5-Air

—

Outputs Comparison

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Key Takeaways

Anthropic
Larger context window (200,000 tokens)
Supports multimodal inputs
Higher GPQA score (87.0% vs 75.0%)
Higher SWE-Bench Verified score (80.9% vs 57.6%)
Zhipu AI
Has open weights

Detailed Comparison

Interactive Arena

Judge for yourself.

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

Claude Opus 4.5
✓ Preferred
GLM-4.5-Air
Open in Playground
AI Model Comparison Table
Feature
Anthropic
Claude Opus 4.5
Zhipu AI
GLM-4.5-Air

FAQ

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

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

Claude Opus 4.5 significantly outperforms across most benchmarks. Claude Opus 4.5 is made by Anthropic and GLM-4.5-Air is made by Zhipu AI. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.

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

Claude Opus 4.5 scores Tau2 Telecom: 98.2%, MMMLU: 90.8%, Tau2 Retail: 88.9%, GPQA: 87.0%, SWE-Bench Verified: 80.9%. 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 4.5 and GLM-4.5-Air?

Claude Opus 4.5 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 4.5 and GLM-4.5-Air?

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

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

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

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