The AI arena is free today

Open Superagent

GLM-5.3 vs Seed 2.1 Turbo

GLM-5.3 leads the LLM Stats Score 54.2 to 44.0.

Zhipu AI · ByteDance · Updated for 2026

Which is better?

GLM-5.3 leads the overall LLM Stats Score 54.2 to 44.0, ranking #6 overall.

In the 7 individual benchmarks reported for both models, GLM-5.3 wins 6; this is a narrower head-to-head signal than the composite indexes.

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

Choose GLM-5.3

  • overall performance matters — it scores 54.2 and ranks #6 on LLM Stats
  • your work emphasizes reasoning and coding — it leads those capability indexes
  • you value its reported benchmark strengths — it wins 6 of 7 exact shared results
  • you want the most recent training data — it shipped Aug 2026

Choose Seed 2.1 Turbo

  • you are already invested in the ByteDance ecosystem

At a glance

The differences that matter most.

GLM-5.3
Zhipu AI
Seed 2.1 Turbo
ByteDance
Core performance indexes
LLM Stats Score
54.2
#6
44.0
#31
Reasoning
53.4
#5
45.4
#27
Coding
45.4
#6
33.2
#36
Agents
41.2
#5
30.4
#28
Cost, coverage & limits
Benchmark wins
6 of 7
1 of 7
Input price
$1.40 / M
— / M
Output price
$4.40 / M
— / M
Context window
1,048,576
—

Capability indexes

Additional strengths measured across groups of related public benchmarks

1 shared
Index
GLM-5.3
Seed 2.1 Turbo
Tool use
35.4#2
23.0#41
Conservative TrueSkill rating · higher is betterHow scores work

Individual benchmarks

16 reported for GLM-5.3 · 90 for Seed 2.1 Turbo

7 shared

GLM-5.3 outperforms in 6 benchmarks (CyberGym, Humanity's Last Exam, NL2Repo, PostTrainBench, Terminal-Bench 2.1, Toolathlon), while Seed 2.1 Turbo is better at 1 benchmark (Program Bench).

GLM-5.3 significantly outperforms across most benchmarks.

Fri Aug 28 2026 • llm-stats.com

Human preference

Blind head-to-head votes and playground preference scores

Context Window

Maximum input and output token capacity

Only GLM-5.3 specifies input context (1,048,576 tokens). Only GLM-5.3 specifies output context (131,072 tokens).

Zhipu AI
GLM-5.3
Input1,048,576 tokens
Output131,072 tokens
ByteDance
Seed 2.1 Turbo
Input- tokens
Output- tokens
Fri Aug 28 2026 • llm-stats.com

Input capabilities

Documented input modalities across available providers

Seed 2.1 Turbo supports multimodal inputs, whereas GLM-5.3 does not.

Seed 2.1 Turbo can handle both text and other forms of data like images, making it suitable for multimodal applications.

GLM-5.3

Text
Images
Audio
Video

Seed 2.1 Turbo

Text
Images
Audio
Video

Release Timeline

When each model was launched

GLM-5.3 was released on 2026-08-14, while Seed 2.1 Turbo was released on 2026-06-24.

GLM-5.3 is 2 months newer than Seed 2.1 Turbo.

GLM-5.3

Aug 14, 2026

2 weeks ago

1mo newer
Seed 2.1 Turbo

Jun 24, 2026

2 months ago

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

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Judge for yourself.

Run your own prompts against GLM-5.3 and Seed 2.1 Turbo side-by-side, then vote on the output you prefer.

GLM-5.3
✓ Preferred
Seed 2.1 Turbo
Open in Playground

FAQ

Common questions about GLM-5.3 vs Seed 2.1 Turbo.

Which is better, GLM-5.3 or Seed 2.1 Turbo?

GLM-5.3 leads the LLM Stats Score 54.2 to 44.0. GLM-5.3 is made by Zhipu AI and Seed 2.1 Turbo is made by ByteDance. The best choice depends on your use case — compare their capability indexes, individual benchmarks, pricing, and limits above.

How does GLM-5.3 compare to Seed 2.1 Turbo in benchmarks?

GLM-5.3 scores Terminal-Bench 2.1: 88.2%, CyberGym: 84.5%, FrontierSWE: 78.1%, Toolathlon: 73.0%, DeepSWE 1.1: 66.9%. Seed 2.1 Turbo scores CharXiv-D: 94.6%, MathVision: 92.7%, MathVista: 90.5%, MathVerse: 89.2%, Video-MME: 89.0%.

What are the context window sizes for GLM-5.3 and Seed 2.1 Turbo?

GLM-5.3 supports 1.0M tokens and Seed 2.1 Turbo 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 GLM-5.3 and Seed 2.1 Turbo?

Key differences include LLM Stats Score (54.2 vs 44.0), multimodal support (no vs yes), licensing (Unknown vs Proprietary). See the full comparison above for benchmark-by-benchmark results.

Who makes GLM-5.3 and Seed 2.1 Turbo?

GLM-5.3 is developed by Zhipu AI and Seed 2.1 Turbo is developed by ByteDance.

Related comparisons