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Grok 4.5 vs Seed 2.1 Turbo

Grok 4.5 and Seed 2.1 Turbo are closely matched at 45.4 and 43.2 on the LLM Stats Score.

xAI · ByteDance · Updated for 2026

Which is better?

Grok 4.5 and Seed 2.1 Turbo are closely matched on the overall LLM Stats Score at 45.4 and 43.2.

In the 3 individual benchmarks reported for both models, Grok 4.5 wins 3; 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 Grok 4.5

  • you value its reported benchmark strengths — it wins 3 of 3 exact shared results
  • you want the most recent training data — it shipped Jul 2026

Choose Seed 2.1 Turbo

  • you are already invested in the ByteDance ecosystem

At a glance

The differences that matter most.

Grok 4.5
xAI
Seed 2.1 Turbo
ByteDance
Core performance indexes
LLM Stats Score
45.4
#28
43.2
#40
Reasoning
43.8
#37
44.6
#33
Coding
35.4
#28
30.9
#47
Agents
31.0
#31
29.1
#37
Cost, coverage & limits
Benchmark wins
3 of 3
0 of 3
Input price
$2.00 / M
— / M
Output price
$6.00 / M
— / M
Context window
500,000
—

Capability indexes

Additional strengths measured across groups of related public benchmarks

1 shared
Index
Grok 4.5
Seed 2.1 Turbo
Tool use
22.2#45
21.7#50
Conservative TrueSkill rating · higher is betterHow scores work

Individual benchmarks

15 reported for Grok 4.5 · 90 for Seed 2.1 Turbo

3 shared

Grok 4.5 outperforms in 3 benchmarks (DeepSWE, SWE-Bench Pro, Terminal-Bench 2.1), while Seed 2.1 Turbo is better at 0 benchmarks.

Grok 4.5 significantly outperforms across most benchmarks.

Thu Sep 10 2026 • llm-stats.com

Human preference

Blind head-to-head votes and playground preference scores

Context Window

Maximum input and output token capacity

Only Grok 4.5 specifies input context (500,000 tokens).

xAI
Grok 4.5
Input500,000 tokens
Output- tokens
ByteDance
Seed 2.1 Turbo
Input- tokens
Output- tokens
Thu Sep 10 2026 • llm-stats.com

Input capabilities

Documented input modalities across available providers

Both Grok 4.5 and Seed 2.1 Turbo support multimodal inputs.

They are both capable of processing various types of data, offering versatility in application.

Grok 4.5

Text
Images
Audio
Video

Seed 2.1 Turbo

Text
Images
Audio
Video

License

Usage and distribution terms

Both models are licensed under proprietary licenses.

Both models have usage restrictions defined by their respective organizations.

Grok 4.5

Proprietary

Closed source

Seed 2.1 Turbo

Proprietary

Closed source

Release Timeline

When each model was launched

Grok 4.5 was released on 2026-07-16, while Seed 2.1 Turbo was released on 2026-06-24.

Grok 4.5 is 1 month newer than Seed 2.1 Turbo.

Grok 4.5

Jul 16, 2026

1 months ago

3w newer
Seed 2.1 Turbo

Jun 24, 2026

2 months ago

Knowledge Cutoff

When training data ends

Grok 4.5 has a documented knowledge cutoff of 2026-02-01, while Seed 2.1 Turbo's cutoff date is not specified.

We can confirm Grok 4.5's training data extends to 2026-02-01, but cannot make a direct comparison without Seed 2.1 Turbo's cutoff date.

Grok 4.5

Feb 2026

Seed 2.1 Turbo

—

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Judge for yourself.

Run your own prompts against Grok 4.5 and Seed 2.1 Turbo side-by-side, then vote on the output you prefer.

Grok 4.5
✓ Preferred
Seed 2.1 Turbo
Open in Playground

FAQ

Common questions about Grok 4.5 vs Seed 2.1 Turbo.

Which is better, Grok 4.5 or Seed 2.1 Turbo?

Grok 4.5 and Seed 2.1 Turbo are closely matched on the LLM Stats Score at 45.4 and 43.2. Grok 4.5 is made by xAI 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 Grok 4.5 compare to Seed 2.1 Turbo in benchmarks?

Grok 4.5 scores GPQA: 93.0%, Terminal-Bench 2.1: 83.3%, SWE-Bench Pro: 64.7%, AA-Omniscience Index: 63.0%, DeepSWE 1.0: 62.0%. 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 Grok 4.5 and Seed 2.1 Turbo?

Grok 4.5 supports 500K 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 Grok 4.5 and Seed 2.1 Turbo?

Key differences include LLM Stats Score (45.4 vs 43.2). See the full comparison above for benchmark-by-benchmark results.

Who makes Grok 4.5 and Seed 2.1 Turbo?

Grok 4.5 is developed by xAI and Seed 2.1 Turbo is developed by ByteDance.

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