Model Comparison

Grok 4.5 vs Seed 2.1 ProWhich is better in 2026?

Grok 4.5 significantly outperforms across most benchmarks.

Verdict: Grok 4.5 vs Seed 2.1 Pro — which is better?

Grok 4.5 (by xAI) and Seed 2.1 Pro (by ByteDance) are two of the AI models people compare most. Here is how they stack up on benchmarks, price and capabilities, and which one to pick in 2026.

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

Choose Grok 4.5 if…

  • you want the strongest raw capability — it leads on 3 of 3 shared benchmarks
  • you want the most recent training data — it shipped Jul 2026

Choose Seed 2.1 Pro if…

  • you are already invested in the ByteDance ecosystem

Performance Benchmarks

Comparative analysis across standard metrics

3 benchmarks

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

Grok 4.5 significantly outperforms across most benchmarks.

Sun Jul 26 2026 • llm-stats.com

Arena Performance

Human preference votes

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 Pro
Input- tokens
Output- tokens
Sun Jul 26 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Both Grok 4.5 and Seed 2.1 Pro 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 Pro

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 Pro

Proprietary

Closed source

Release Timeline

When each model was launched

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

Grok 4.5 is 1 month newer than Seed 2.1 Pro.

Grok 4.5

Jul 16, 2026

1 weeks ago

3w newer
Seed 2.1 Pro

Jun 24, 2026

1 months ago

Knowledge Cutoff

When training data ends

Grok 4.5 has a documented knowledge cutoff of 2026-02-01, while Seed 2.1 Pro'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 Pro's cutoff date.

Grok 4.5

Feb 2026

Seed 2.1 Pro

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Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Key Takeaways

xAI
Larger context window (500,000 tokens)
Higher DeepSWE score (53.0% vs 32.7%)
Higher SWE-Bench Pro score (64.7% vs 57.5%)
Higher Terminal-Bench 2.1 score (83.3% vs 71.0%)
ByteDance

No standout differentiators in the data we have for this pair.

Detailed Comparison

Interactive Arena

Judge for yourself.

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

Grok 4.5
✓ Preferred
Seed 2.1 Pro
Open in Playground
AI Model Comparison Table
Feature
xAI
Grok 4.5
ByteDance
Seed 2.1 Pro

FAQ

Common questions about Grok 4.5 vs Seed 2.1 Pro.

Which is better, Grok 4.5 or Seed 2.1 Pro?

Grok 4.5 significantly outperforms across most benchmarks. Grok 4.5 is made by xAI and Seed 2.1 Pro is made by ByteDance. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.

How does Grok 4.5 compare to Seed 2.1 Pro in benchmarks?

Grok 4.5 scores GPQA: 93.0%, Terminal-Bench 2.1: 83.3%, Artificial Analysis Coding Agent Index v1.1: 76.0%, SWE-Bench Pro: 64.7%, AA-Omniscience Index: 63.0%. Seed 2.1 Pro scores CharXiv-D: 95.5%, MathVision: 94.5%, MathVista: 90.7%, MathVerse: 89.7%, Video-MME: 89.2%.

What are the context window sizes for Grok 4.5 and Seed 2.1 Pro?

Grok 4.5 supports 500K tokens and Seed 2.1 Pro supports an unknown number of tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

Who makes Grok 4.5 and Seed 2.1 Pro?

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

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