Model Comparison

Seed 2.1 Pro vs Grok 4.5Which is better in 2026?

Grok 4.5 significantly outperforms across most benchmarks.

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

Seed 2.1 Pro (by ByteDance) and Grok 4.5 (by xAI) 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.

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

Choose Seed 2.1 Pro if…

  • you are already invested in the ByteDance ecosystem

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

Performance Benchmarks

Comparative analysis across standard metrics

3 benchmarks

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

Grok 4.5 significantly outperforms across most benchmarks.

Fri Jul 17 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).

ByteDance
Seed 2.1 Pro
Input- tokens
Output- tokens
xAI
Grok 4.5
Input500,000 tokens
Output- tokens
Fri Jul 17 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Both Seed 2.1 Pro and Grok 4.5 support multimodal inputs.

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

Seed 2.1 Pro

Text
Images
Audio
Video

Grok 4.5

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.

Seed 2.1 Pro

Proprietary

Closed source

Grok 4.5

Proprietary

Closed source

Release Timeline

When each model was launched

Seed 2.1 Pro was released on 2026-06-24, while Grok 4.5 was released on 2026-07-08.

Grok 4.5 is 0 month newer than Seed 2.1 Pro.

Seed 2.1 Pro

Jun 24, 2026

3 weeks ago

Grok 4.5

Jul 8, 2026

1 weeks ago

2w newer

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→

Key Takeaways

ByteDance

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

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%)

Detailed Comparison

Interactive Arena

Judge for yourself.

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

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

FAQ

Common questions about Seed 2.1 Pro vs Grok 4.5.

Which is better, Seed 2.1 Pro or Grok 4.5?

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

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

Seed 2.1 Pro scores CharXiv-D: 95.5%, MathVision: 94.5%, MathVista: 90.7%, MathVerse: 89.7%, Video-MME: 89.2%. 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%.

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

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

Who makes Seed 2.1 Pro and Grok 4.5?

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

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