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Claude 3 Opus vs GLM-5.3

Comparing Claude 3 Opus and GLM-5.3 across benchmarks, pricing, and capabilities.

Anthropic · Zhipu AI · Updated for 2026

Which is better?

Claude 3 Opus and GLM-5.3 trade strengths across price, capabilities, and technical limits. The better choice depends on the workload.

On price, GLM-5.3 is roughly 14.0x 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 Claude 3 Opus

  • you want predictable pricing at $15.00/M input and $75.00/M output

Choose GLM-5.3

  • cost matters — it's about 14.0x cheaper per token
  • you process long inputs — it offers a 1,000,000 token context window
  • you want the most recent training data — it shipped Aug 2026

At a glance

The differences that matter most.

Claude 3 Opus
Anthropic
GLM-5.3
Zhipu AI
Benchmark wins
—
—
Input price
$15.00 / M
$1.40 / M
Output price
$75.00 / M
$4.40 / M
Context window
200,000
1,000,000
Released
Feb 2024
Aug 2026
License
Proprietary
Unknown

Performance Benchmarks

Comparative analysis across standard metrics

No common benchmarks found

Claude 3 Opus and GLM-5.3don'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

GLM-5.3 costs less

For input processing, Claude 3 Opus ($15.00/1M tokens) is 10.7x more expensive than GLM-5.3 ($1.40/1M tokens).

For output processing, Claude 3 Opus ($75.00/1M tokens) is 17.0x more expensive than GLM-5.3 ($4.40/1M tokens).

In conclusion, Claude 3 Opus is more expensive than GLM-5.3.*

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

Lowest available price from all providers
Mon Aug 24 2026 • llm-stats.com
Anthropic
Claude 3 Opus
Input tokens$15.00
Output tokens$75.00
Best providerAnthropic
Zhipu AI
GLM-5.3
Input tokens$1.40
Output tokens$4.40
Best providerUnknown Organization
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 Claude 3 Opus's 200,000 tokens. Claude 3 Opus can generate longer responses up to 200,000 tokens, while GLM-5.3 is limited to 128,000 tokens.

Anthropic
Claude 3 Opus
Input200,000 tokens
Output200,000 tokens
Zhipu AI
GLM-5.3
Input1,000,000 tokens
Output128,000 tokens
Mon Aug 24 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Claude 3 Opus supports multimodal inputs, whereas GLM-5.3 does not.

Claude 3 Opus can handle both text and other forms of data like images, making it suitable for multimodal applications.

Claude 3 Opus

Text
Images
Audio
Video

GLM-5.3

Text
Images
Audio
Video

Release Timeline

When each model was launched

Claude 3 Opus was released on 2024-02-29, while GLM-5.3 was released on 2026-08-14.

GLM-5.3 is 30 months newer than Claude 3 Opus.

Claude 3 Opus

Feb 29, 2024

2.5 years ago

GLM-5.3

Aug 14, 2026

1 weeks ago

2.5yr 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

Provider Availability

Claude 3 Opus is available from Anthropic, Bedrock, Google. GLM-5.3 is available from ZAI.

Claude 3 Opus

anthropic logo
Anthropic
Input Price:Input: $15.00/1MOutput Price:Output: $75.00/1M
bedrock logo
AWS Bedrock
Input Price:Input: $15.00/1MOutput Price:Output: $75.00/1M
google logo
Google
Input Price:Input: $15.00/1MOutput Price:Output: $75.00/1M

GLM-5.3

z logo
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 3 Opus and GLM-5.3 side-by-side, then vote on the output you prefer.

Claude 3 Opus
✓ Preferred
GLM-5.3
Open in Playground

FAQ

Common questions about Claude 3 Opus vs GLM-5.3.

Which is better, Claude 3 Opus or GLM-5.3?

Claude 3 Opus (Anthropic) and GLM-5.3 (Zhipu AI) each have strengths in different areas. Compare their benchmark scores, pricing, context windows, and capabilities above to determine which fits your needs.

How does Claude 3 Opus compare to GLM-5.3 in benchmarks?

Claude 3 Opus scores ARC-C: 96.4%, HellaSwag: 95.4%, GSM8k: 95.0%, MGSM: 90.7%, BIG-Bench Hard: 86.8%. 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 3 Opus cheaper than GLM-5.3?

GLM-5.3 is 10.7x cheaper for input tokens. Claude 3 Opus costs $15.00/M input and $75.00/M output via anthropic. GLM-5.3 costs $1.40/M input and $4.40/M output via z.

What are the context window sizes for Claude 3 Opus and GLM-5.3?

Claude 3 Opus supports 200K 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 3 Opus and GLM-5.3?

Key differences include context window (200K vs 1.0M), input pricing ($15.00 vs $1.40/M), multimodal support (yes vs no), licensing (Proprietary vs Unknown). See the full comparison above for benchmark-by-benchmark results.

Who makes Claude 3 Opus and GLM-5.3?

Claude 3 Opus is developed by Anthropic and GLM-5.3 is developed by Zhipu AI.

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