Model Comparison

Seed 2.1 Pro vs Grok 4.3Which is better in 2026?

Comparing Seed 2.1 Pro and Grok 4.3 across benchmarks, pricing, and capabilities.

Verdict: Seed 2.1 Pro vs Grok 4.3 — which is better?

Seed 2.1 Pro (by ByteDance) and Grok 4.3 (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.

Choose Seed 2.1 Pro if…

  • you want the most recent training data — it shipped Jun 2026

Choose Grok 4.3 if…

  • you want predictable pricing at $1.25/M input and $2.50/M output

Performance Benchmarks

Comparative analysis across standard metrics

No common benchmarks found

Seed 2.1 Pro and Grok 4.3don't have any common benchmark datasets to compare. They may have been evaluated on different testing suites.

Arena Performance

Human preference votes

Context Window

Maximum input and output token capacity

Only Grok 4.3 specifies input context (1,000,000 tokens).

ByteDance
Seed 2.1 Pro
Input- tokens
Output- tokens
xAI
Grok 4.3
Input1,000,000 tokens
Output- tokens
Fri Jul 17 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Seed 2.1 Pro supports multimodal inputs, whereas Grok 4.3 does not.

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

Seed 2.1 Pro

Text
Images
Audio
Video

Grok 4.3

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 4.3

Proprietary

Closed source

Release Timeline

When each model was launched

Seed 2.1 Pro was released on 2026-06-24, while Grok 4.3 was released on 2026-05-06.

Seed 2.1 Pro is 2 months newer than Grok 4.3.

Seed 2.1 Pro

Jun 24, 2026

3 weeks ago

1mo newer
Grok 4.3

May 6, 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→

Key Takeaways

ByteDance
Supports multimodal inputs
xAI
Larger context window (1,000,000 tokens)

Detailed Comparison

Interactive Arena

Judge for yourself.

Run your own prompts against Seed 2.1 Pro and Grok 4.3 side-by-side, then vote on the output you prefer.

Seed 2.1 Pro
✓ Preferred
Grok 4.3
Open in Playground
AI Model Comparison Table
Feature
ByteDance
Seed 2.1 Pro
xAI
Grok 4.3

FAQ

Common questions about Seed 2.1 Pro vs Grok 4.3.

Which is better, Seed 2.1 Pro or Grok 4.3?

Seed 2.1 Pro (ByteDance) and Grok 4.3 (xAI) each have strengths in different areas. Compare their benchmark scores, pricing, context windows, and capabilities above to determine which fits your needs.

How does Seed 2.1 Pro compare to Grok 4.3 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 4.3 scores Finance Agent v2: 37.7%, GDPval-AA: 36.7%.

What are the context window sizes for Seed 2.1 Pro and Grok 4.3?

Seed 2.1 Pro supports an unknown number of tokens and Grok 4.3 supports 1.0M tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

What are the main differences between Seed 2.1 Pro and Grok 4.3?

Key differences include multimodal support (yes vs no). See the full comparison above for benchmark-by-benchmark results.

Who makes Seed 2.1 Pro and Grok 4.3?

Seed 2.1 Pro is developed by ByteDance and Grok 4.3 is developed by xAI.

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