Claude 3.5 Sonnet vs GLM-5.3
Comparing Claude 3.5 Sonnet and GLM-5.3 across benchmarks, pricing, and capabilities.
Anthropic · Zhipu AI · Updated for 2026
Which is better?
Claude 3.5 Sonnet 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 2.8x 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 3.5 Sonnet
- you want predictable pricing at $3.00/M input and $15.00/M output
Choose GLM-5.3
- cost matters — it's about 2.8x 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.
Performance Benchmarks
Comparative analysis across standard metrics
Claude 3.5 Sonnet 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
For input processing, Claude 3.5 Sonnet ($3.00/1M tokens) is 2.1x more expensive than GLM-5.3 ($1.40/1M tokens).
For output processing, Claude 3.5 Sonnet ($15.00/1M tokens) is 3.4x more expensive than GLM-5.3 ($4.40/1M tokens).
In conclusion, Claude 3.5 Sonnet is more expensive than GLM-5.3.*
* Using a 3:1 ratio of input to output tokens
Context Window
Maximum input and output token capacity
GLM-5.3 accepts 1,000,000 input tokens compared to Claude 3.5 Sonnet's 200,000 tokens. Claude 3.5 Sonnet can generate longer responses up to 200,000 tokens, while GLM-5.3 is limited to 128,000 tokens.
Input Capabilities
Supported data types and modalities
Claude 3.5 Sonnet supports multimodal inputs, whereas GLM-5.3 does not.
Claude 3.5 Sonnet can handle both text and other forms of data like images, making it suitable for multimodal applications.
Claude 3.5 Sonnet
GLM-5.3
Release Timeline
When each model was launched
Claude 3.5 Sonnet was released on 2024-10-22, while GLM-5.3 was released on 2026-08-14.
GLM-5.3 is 22 months newer than Claude 3.5 Sonnet.
Oct 22, 2024
1.8 years ago
Aug 14, 2026
1 weeks ago
1.8yr newerKnowledge Cutoff
When training data ends
Neither model specifies a knowledge cutoff date.
Unable to compare the recency of their training data.
Provider Availability
Claude 3.5 Sonnet is available from Anthropic, Bedrock, Google. GLM-5.3 is available from ZAI.
Claude 3.5 Sonnet
GLM-5.3
Outputs Comparison
Judge for yourself.
Run your own prompts against Claude 3.5 Sonnet and GLM-5.3 side-by-side, then vote on the output you prefer.
FAQ
Common questions about Claude 3.5 Sonnet vs GLM-5.3.