Claude Sonnet 4.6 vs GLM-5.3
GLM-5.3 significantly outperforms across most benchmarks. GLM-5.3 is 2.8x cheaper per token.
Anthropic · Zhipu AI · Updated for 2026
Which is better?
Claude Sonnet 4.6 outperforms in 0 benchmarks, while GLM-5.3 is better at 2 benchmarks (DeepSWE 1.1, Humanity's Last Exam). GLM-5.3 significantly outperforms across most benchmarks.
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 Sonnet 4.6
- you want predictable pricing at $3.00/M input and $15.00/M output
Choose GLM-5.3
- you want the strongest raw capability — it leads on 2 of 2 shared benchmarks
- 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 Sonnet 4.6 outperforms in 0 benchmarks, while GLM-5.3 is better at 2 benchmarks (DeepSWE 1.1, Humanity's Last Exam).
GLM-5.3 significantly outperforms across most benchmarks.
Arena Performance
Playground indexes and blind preference scores
Pricing Analysis
Price comparison per million tokens
For input processing, Claude Sonnet 4.6 ($3.00/1M tokens) is 2.1x more expensive than GLM-5.3 ($1.40/1M tokens).
For output processing, Claude Sonnet 4.6 ($15.00/1M tokens) is 3.4x more expensive than GLM-5.3 ($4.40/1M tokens).
In conclusion, Claude Sonnet 4.6 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 Sonnet 4.6's 200,000 tokens. GLM-5.3 can generate longer responses up to 128,000 tokens, while Claude Sonnet 4.6 is limited to 64,000 tokens.
Input Capabilities
Supported data types and modalities
Claude Sonnet 4.6 supports multimodal inputs, whereas GLM-5.3 does not.
Claude Sonnet 4.6 can handle both text and other forms of data like images, making it suitable for multimodal applications.
Claude Sonnet 4.6
GLM-5.3
Release Timeline
When each model was launched
Claude Sonnet 4.6 was released on 2026-02-17, while GLM-5.3 was released on 2026-08-14.
GLM-5.3 is 6 months newer than Claude Sonnet 4.6.
Feb 17, 2026
6 months ago
Aug 14, 2026
1 weeks ago
5mo 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 Sonnet 4.6 is available from Anthropic. GLM-5.3 is available from ZAI.
Claude Sonnet 4.6
GLM-5.3
Outputs Comparison
Judge for yourself.
Run your own prompts against Claude Sonnet 4.6 and GLM-5.3 side-by-side, then vote on the output you prefer.
FAQ
Common questions about Claude Sonnet 4.6 vs GLM-5.3.