Claude Opus 5.5 vs GLM-5.3

Claude Opus 5.5 leads the LLM Stats Score 59.7 to 52.1. GLM-5.3 is 4.2x cheaper per token.

Anthropic · Zhipu AI · Updated for 2026

Which is better?

Claude Opus 5.5 leads the overall LLM Stats Score 59.7 to 52.1, ranking #1 overall.

In the 4 individual benchmarks reported for both models, Claude Opus 5.5 wins 3; this is a narrower head-to-head signal than the composite indexes.

On price, GLM-5.3 is roughly 4.2x 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 (1,048,576 input tokens), making it the stronger choice for long documents and large codebases.

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

Choose Claude Opus 5.5

overall performance matters — it scores 59.7 and ranks #1 on LLM Stats
your work emphasizes reasoning and coding — it leads those capability indexes
you value its reported benchmark strengths — it wins 3 of 4 exact shared results
you want the most recent training data — it shipped Sep 2026

Choose GLM-5.3

cost matters — it's about 4.2x cheaper per token
you process long inputs — it offers a 1,048,576 token context window
you need open weights you can self-host or fine-tune

At a glance

The differences that matter most.

Better token value: GLM-5.3

Core performance indexes

LLM Stats Score

59.7

#1 · 23 evals

Best

52.1

#10 · 17 evals

Reasoning

57.8

#1 · 18 evals

Best

51.2

#9 · 9 evals

Coding

51.7

#1 · 10 evals

Best

41.8

#8 · 12 evals

Agents

44.5

#2 · 12 evals

Best

38.5

#9 · 16 evals

Cost, coverage & limits

Benchmark wins

3 of 4

Best

1 of 4

Input price

$4.00 / M

$1.20 / M

Best

Output price

$20.00 / M

$4.00 / M

Best

Context window

1,000,000

1,048,576

Best

Capability indexes

Additional strengths measured across groups of related public benchmarks

1 shared

Index

Claude Opus 5.5

GLM-5.3

Tool use

32.9#2 · 4 evals

30.4#6 · 6 evals

Conservative TrueSkill rating · higher is betterHow scores work

Individual benchmarks

31 reported for Claude Opus 5.5 · 17 for GLM-5.3

4 shared

Claude Opus 5.5 outperforms in 3 benchmarks (DeepSWE 1.1, Program Bench, Terminal-Bench 4.0), while GLM-5.3 is better at 1 benchmark (AutomationBench).

Claude Opus 5.5 shows notably better performance in the majority of benchmarks.

Wed Sep 23 2026 • llm-stats.com

Human preference

Blind head-to-head votes and playground preference scores

Pricing Analysis

Price comparison per million tokens

GLM-5.3 costs less

For input processing, Claude Opus 5.5 ($4.00/1M tokens) is 3.3x more expensive than GLM-5.3 ($1.20/1M tokens).

For output processing, Claude Opus 5.5 ($20.00/1M tokens) is 5.0x more expensive than GLM-5.3 ($4.00/1M tokens).

In conclusion, Claude Opus 5.5 is more expensive than GLM-5.3.*

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

Lowest available price from all providers

Wed Sep 23 2026 • llm-stats.com

Claude Opus 5.5

Input tokens$4.00

Output tokens$20.00

Best providerAnthropic

GLM-5.3

Input tokens$1.20

Output tokens$4.00

Best providerDeepinfra

Notice missing or incorrect data?Start an Issue→

Context Window

Maximum input and output token capacity

GLM-5.3 accepts 1,048,576 input tokens compared to Claude Opus 5.5's 1,000,000 tokens. GLM-5.3 can generate longer responses up to 1,048,576 tokens, while Claude Opus 5.5 is limited to 128,000 tokens.

Claude Opus 5.5

Input1,000,000 tokens

Output128,000 tokens

GLM-5.3

Input1,048,576 tokens

Output1,048,576 tokens

Wed Sep 23 2026 • llm-stats.com

Input capabilities

Documented input modalities across available providers

Claude Opus 5.5 supports multimodal inputs, whereas GLM-5.3 does not.

Claude Opus 5.5 can handle both text and other forms of data like images, making it suitable for multimodal applications.

Claude Opus 5.5

Text

Images

Audio

Video

GLM-5.3

Text

Images

Audio

Video

License

Usage and distribution terms

Claude Opus 5.5 is licensed under a proprietary license, while GLM-5.3 uses GLM-5.3 License.

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

Claude Opus 5.5

Proprietary

Closed source

GLM-5.3

GLM-5.3 License

Open weights

Release Timeline

When each model was launched

Claude Opus 5.5 was released on 2026-09-22, while GLM-5.3 was released on 2026-08-14.

Claude Opus 5.5 is 1 month newer than GLM-5.3.

Claude Opus 5.5

Sep 22, 2026

0 days ago

1mo newer

GLM-5.3

Aug 14, 2026

1 months ago

Knowledge Cutoff

When training data ends

Claude Opus 5.5 has a documented knowledge cutoff of 2026-06-01, while GLM-5.3's cutoff date is not specified.

We can confirm Claude Opus 5.5's training data extends to 2026-06-01, but cannot make a direct comparison without GLM-5.3's cutoff date.

Claude Opus 5.5

Jun 2026

GLM-5.3

—

Provider Availability

Claude Opus 5.5 is available from Anthropic. GLM-5.3 is available from DeepInfra, FriendliAI, Novita, ZAI.

Claude Opus 5.5

Anthropic

Input Price:Input: $4.00/1MOutput Price:Output: $20.00/1M

GLM-5.3

Deepinfra

Input Price:Input: $1.20/1MOutput Price:Output: $4.00/1M

FriendliAI

Input Price:Input: $1.40/1MOutput Price:Output: $4.40/1M

Novita

Input Price:Input: $1.40/1MOutput Price:Output: $4.40/1M

Unknown Organization

Input Price:Input: $1.40/1MOutput Price:Output: $4.40/1M

* 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 Claude Opus 5.5 and GLM-5.3 side-by-side, then vote on the output you prefer.

Claude Opus 5.5

✓ Preferred

GLM-5.3

Open in Playground

FAQ

Common questions about Claude Opus 5.5 vs GLM-5.3.

Which is better, Claude Opus 5.5 or GLM-5.3?

Claude Opus 5.5 leads the LLM Stats Score 59.7 to 52.1. Claude Opus 5.5 is made by Anthropic and GLM-5.3 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 5.5 compare to GLM-5.3 in benchmarks?

Claude Opus 5.5 scores BenchCAD (with Python tool): 96.2%, Global-MMLU: 94.3%, SWE-bench Multilingual: 93.9%, MILU: 93.1%, ArXivMath: 91.2%. GLM-5.3 scores Terminal-Bench 2.1: 88.2%, CyberGym: 84.5%, FrontierSWE: 78.1%, Toolathlon: 73.0%, DeepSWE 1.1: 66.9%.

Is Claude Opus 5.5 cheaper than GLM-5.3?

GLM-5.3 is 3.3x cheaper for input tokens. Claude Opus 5.5 costs $4.00/M input and $20.00/M output via anthropic. GLM-5.3 costs $1.20/M input and $4.00/M output via deepinfra.

What are the context window sizes for Claude Opus 5.5 and GLM-5.3?

Claude Opus 5.5 supports 1.0M tokens and GLM-5.3 supports 1.0M 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 5.5 and GLM-5.3?

Key differences include LLM Stats Score (59.7 vs 52.1), context window (1.0M vs 1.0M), input pricing ($4.00 vs $1.20/M), multimodal support (yes vs no), licensing (Proprietary vs GLM-5.3 License). See the full comparison above for benchmark-by-benchmark results.

Who makes Claude Opus 5.5 and GLM-5.3?

Claude Opus 5.5 is developed by Anthropic and GLM-5.3 is developed by Zhipu AI.

Claude Opus 5.5 vs GLM-5.3