Model Comparison

Seed 2.1 Pro vs Kimi K2.6Which is better in 2026?

Seed 2.1 Pro shows notably better performance in the majority of benchmarks.

Verdict: Seed 2.1 Pro vs Kimi K2.6 — which is better?

Seed 2.1 Pro (by ByteDance) and Kimi K2.6 (by Moonshot AI) 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 7 benchmarks (APEX-Agents, BabyVision, Humanity's Last Exam, MathVision, MMMU-Pro, SciCode, Toolathlon), while Kimi K2.6 is better at 3 benchmarks (BrowseComp, CharXiv-R, SWE-Bench Pro). Seed 2.1 Pro shows notably better performance in the majority of benchmarks.

Choose Seed 2.1 Pro if…

  • you want the strongest raw capability — it leads on 7 of 10 shared benchmarks
  • you want the most recent training data — it shipped Jun 2026

Choose Kimi K2.6 if…

  • you need open weights you can self-host or fine-tune

Performance Benchmarks

Comparative analysis across standard metrics

10 benchmarks

Seed 2.1 Pro outperforms in 7 benchmarks (APEX-Agents, BabyVision, Humanity's Last Exam, MathVision, MMMU-Pro, SciCode, Toolathlon), while Kimi K2.6 is better at 3 benchmarks (BrowseComp, CharXiv-R, SWE-Bench Pro).

Seed 2.1 Pro shows notably better performance in the majority of benchmarks.

Fri Jul 17 2026 • llm-stats.com

Arena Performance

Human preference votes

Context Window

Maximum input and output token capacity

Only Kimi K2.6 specifies input context (262,144 tokens). Only Kimi K2.6 specifies output context (131,072 tokens).

ByteDance
Seed 2.1 Pro
Input- tokens
Output- tokens
Moonshot AI
Kimi K2.6
Input262,144 tokens
Output131,072 tokens
Fri Jul 17 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Both Seed 2.1 Pro and Kimi K2.6 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

Kimi K2.6

Text
Images
Audio
Video

License

Usage and distribution terms

Seed 2.1 Pro is licensed under a proprietary license, while Kimi K2.6 uses Modified MIT License.

License differences may affect how you can use these models in commercial or open-source projects.

Seed 2.1 Pro

Proprietary

Closed source

Kimi K2.6

Modified MIT License

Open weights

Release Timeline

When each model was launched

Seed 2.1 Pro was released on 2026-06-24, while Kimi K2.6 was released on 2026-04-20.

Seed 2.1 Pro is 2 months newer than Kimi K2.6.

Seed 2.1 Pro

Jun 24, 2026

3 weeks ago

2mo newer
Kimi K2.6

Apr 20, 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
Higher APEX-Agents score (33.8% vs 27.9%)
Higher BabyVision score (73.7% vs 68.5%)
Higher Humanity's Last Exam score (55.7% vs 36.4%)
Higher MathVision score (94.5% vs 93.2%)
Higher MMMU-Pro score (82.7% vs 80.1%)
Higher SciCode score (59.8% vs 52.2%)
Higher Toolathlon score (50.6% vs 50.0%)
Moonshot AI
Larger context window (262,144 tokens)
Has open weights
Higher BrowseComp score (86.3% vs 86.2%)
Higher CharXiv-R score (86.7% vs 86.4%)
Higher SWE-Bench Pro score (58.6% vs 57.5%)

Detailed Comparison

Interactive Arena

Judge for yourself.

Run your own prompts against Seed 2.1 Pro and Kimi K2.6 side-by-side, then vote on the output you prefer.

Seed 2.1 Pro
✓ Preferred
Kimi K2.6
Open in Playground
AI Model Comparison Table
Feature
ByteDance
Seed 2.1 Pro
Moonshot AI
Kimi K2.6

FAQ

Common questions about Seed 2.1 Pro vs Kimi K2.6.

Which is better, Seed 2.1 Pro or Kimi K2.6?

Seed 2.1 Pro shows notably better performance in the majority of benchmarks. Seed 2.1 Pro is made by ByteDance and Kimi K2.6 is made by Moonshot AI. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.

How does Seed 2.1 Pro compare to Kimi K2.6 in benchmarks?

Seed 2.1 Pro scores CharXiv-D: 95.5%, MathVision: 94.5%, MathVista: 90.7%, MathVerse: 89.7%, Video-MME: 89.2%. Kimi K2.6 scores V*: 96.9%, AIME 2026: 96.4%, MathVision: 93.2%, HMMT Feb 26: 92.7%, GPQA: 90.5%.

What are the context window sizes for Seed 2.1 Pro and Kimi K2.6?

Seed 2.1 Pro supports an unknown number of tokens and Kimi K2.6 supports 262K 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 Kimi K2.6?

Key differences include licensing (Proprietary vs Modified MIT License). See the full comparison above for benchmark-by-benchmark results.

Who makes Seed 2.1 Pro and Kimi K2.6?

Seed 2.1 Pro is developed by ByteDance and Kimi K2.6 is developed by Moonshot AI.

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