Model Comparison

GPT-5.2 vs Seed 2.1 TurboWhich is better in 2026?

Seed 2.1 Turbo significantly outperforms across most benchmarks.

Verdict: GPT-5.2 vs Seed 2.1 Turbo — which is better?

GPT-5.2 (by OpenAI) and Seed 2.1 Turbo (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.

GPT-5.2 outperforms in 0 benchmarks, while Seed 2.1 Turbo is better at 6 benchmarks (BrowseComp, CharXiv-R, Humanity's Last Exam, MCP Atlas, MMMU-Pro, Toolathlon). Seed 2.1 Turbo significantly outperforms across most benchmarks.

Choose GPT-5.2 if…

  • you want predictable pricing at $1.75/M input and $14.00/M output

Choose Seed 2.1 Turbo if…

  • you want the strongest raw capability — it leads on 6 of 6 shared benchmarks
  • you want the most recent training data — it shipped Jun 2026

Performance Benchmarks

Comparative analysis across standard metrics

6 benchmarks

GPT-5.2 outperforms in 0 benchmarks, while Seed 2.1 Turbo is better at 6 benchmarks (BrowseComp, CharXiv-R, Humanity's Last Exam, MCP Atlas, MMMU-Pro, Toolathlon).

Seed 2.1 Turbo significantly outperforms across most benchmarks.

Tue Jul 28 2026 • llm-stats.com

Arena Performance

Human preference votes

Context Window

Maximum input and output token capacity

Only GPT-5.2 specifies input context (400,000 tokens). Only GPT-5.2 specifies output context (128,000 tokens).

OpenAI
GPT-5.2
Input400,000 tokens
Output128,000 tokens
ByteDance
Seed 2.1 Turbo
Input- tokens
Output- tokens
Tue Jul 28 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Both GPT-5.2 and Seed 2.1 Turbo support multimodal inputs.

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

GPT-5.2

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.

GPT-5.2

Proprietary

Closed source

Seed 2.1 Turbo

Proprietary

Closed source

Release Timeline

When each model was launched

GPT-5.2 was released on 2025-12-11, while Seed 2.1 Turbo was released on 2026-06-24.

Seed 2.1 Turbo is 7 months newer than GPT-5.2.

GPT-5.2

Dec 11, 2025

7 months ago

Seed 2.1 Turbo

Jun 24, 2026

1 months ago

6mo newer

Knowledge Cutoff

When training data ends

GPT-5.2 has a documented knowledge cutoff of 2025-08-25, while Seed 2.1 Turbo's cutoff date is not specified.

We can confirm GPT-5.2's training data extends to 2025-08-25, but cannot make a direct comparison without Seed 2.1 Turbo's cutoff date.

GPT-5.2

Aug 2025

Seed 2.1 Turbo

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Outputs Comparison

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Key Takeaways

OpenAI
Larger context window (400,000 tokens)
ByteDance
Higher BrowseComp score (84.9% vs 65.8%)
Higher CharXiv-R score (83.6% vs 82.1%)
Higher Humanity's Last Exam score (54.6% vs 34.5%)
Higher MCP Atlas score (80.3% vs 60.6%)
Higher MMMU-Pro score (82.2% vs 79.5%)
Higher Toolathlon score (49.1% vs 46.3%)

Detailed Comparison

Interactive Arena

Judge for yourself.

Run your own prompts against GPT-5.2 and Seed 2.1 Turbo side-by-side, then vote on the output you prefer.

GPT-5.2
✓ Preferred
Seed 2.1 Turbo
Open in Playground
AI Model Comparison Table
Feature
OpenAI
GPT-5.2
ByteDance
Seed 2.1 Turbo

FAQ

Common questions about GPT-5.2 vs Seed 2.1 Turbo.

Which is better, GPT-5.2 or Seed 2.1 Turbo?

Seed 2.1 Turbo significantly outperforms across most benchmarks. GPT-5.2 is made by OpenAI and Seed 2.1 Turbo is made by ByteDance. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.

How does GPT-5.2 compare to Seed 2.1 Turbo in benchmarks?

GPT-5.2 scores AIME 2025: 100.0%, HMMT 2025: 99.4%, Tau2 Telecom: 98.7%, Graphwalks BFS <128k: 94.0%, GPQA: 92.4%. 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 GPT-5.2 and Seed 2.1 Turbo?

GPT-5.2 supports 400K 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.

Who makes GPT-5.2 and Seed 2.1 Turbo?

GPT-5.2 is developed by OpenAI and Seed 2.1 Turbo is developed by ByteDance.

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