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DeepSeek-V4-Flash-Vision-Exp vs Seed 2.1 Pro

DeepSeek-V4-Flash-Vision-Exp significantly outperforms across most benchmarks.

DeepSeek · ByteDance · Updated for 2026

Which is better?

DeepSeek-V4-Flash-Vision-Exp outperforms in 4 benchmarks (DeepSWE, NL2Repo, Terminal-Bench 2.1, ZEROBench), while Seed 2.1 Pro is better at 1 benchmark (Agents' Last Exam). DeepSeek-V4-Flash-Vision-Exp significantly outperforms across most benchmarks.

Based on current benchmark, pricing, and model metadata for 2026.

Choose DeepSeek-V4-Flash-Vision-Exp

  • you want the strongest raw capability — it leads on 4 of 5 shared benchmarks
  • you want the most recent training data — it shipped Aug 2026

Choose Seed 2.1 Pro

  • you are already invested in the ByteDance ecosystem

At a glance

The differences that matter most.

DeepSeek-V4-Flash-Vision-Exp
DeepSeek
Seed 2.1 Pro
ByteDance
Benchmark wins
4 of 5
1 of 5
Input price
$0.22 / M
— / M
Output price
$0.66 / M
— / M
Context window
1,048,576
—
Released
Aug 2026
Jun 2026
License
Unknown
Proprietary

Performance Benchmarks

Comparative analysis across standard metrics

5 benchmarks

DeepSeek-V4-Flash-Vision-Exp outperforms in 4 benchmarks (DeepSWE, NL2Repo, Terminal-Bench 2.1, ZEROBench), while Seed 2.1 Pro is better at 1 benchmark (Agents' Last Exam).

DeepSeek-V4-Flash-Vision-Exp significantly outperforms across most benchmarks.

Mon Aug 24 2026 • llm-stats.com

Arena Performance

Playground indexes and blind preference scores

Context Window

Maximum input and output token capacity

Only DeepSeek-V4-Flash-Vision-Exp specifies input context (1,048,576 tokens). Only DeepSeek-V4-Flash-Vision-Exp specifies output context (393,216 tokens).

DeepSeek
DeepSeek-V4-Flash-Vision-Exp
Input1,048,576 tokens
Output393,216 tokens
ByteDance
Seed 2.1 Pro
Input- tokens
Output- tokens
Mon Aug 24 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Both DeepSeek-V4-Flash-Vision-Exp and Seed 2.1 Pro support multimodal inputs.

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

DeepSeek-V4-Flash-Vision-Exp

Text
Images
Audio
Video

Seed 2.1 Pro

Text
Images
Audio
Video

Release Timeline

When each model was launched

DeepSeek-V4-Flash-Vision-Exp was released on 2026-08-21, while Seed 2.1 Pro was released on 2026-06-24.

DeepSeek-V4-Flash-Vision-Exp is 2 months newer than Seed 2.1 Pro.

DeepSeek-V4-Flash-Vision-Exp

Aug 21, 2026

3 days ago

1mo newer
Seed 2.1 Pro

Jun 24, 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→

Judge for yourself.

Run your own prompts against DeepSeek-V4-Flash-Vision-Exp and Seed 2.1 Pro side-by-side, then vote on the output you prefer.

DeepSeek-V4-Flash-Vision-Exp
✓ Preferred
Seed 2.1 Pro
Open in Playground

FAQ

Common questions about DeepSeek-V4-Flash-Vision-Exp vs Seed 2.1 Pro.

Which is better, DeepSeek-V4-Flash-Vision-Exp or Seed 2.1 Pro?

DeepSeek-V4-Flash-Vision-Exp significantly outperforms across most benchmarks. DeepSeek-V4-Flash-Vision-Exp is made by DeepSeek 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 DeepSeek-V4-Flash-Vision-Exp compare to Seed 2.1 Pro in benchmarks?

DeepSeek-V4-Flash-Vision-Exp scores Terminal-Bench 2.1: 83.9%, DSBench-Hard: 63.6%, DeepSWE: 59.3%, NL2Repo: 57.7%, ZEROBench: 35.0%. 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 DeepSeek-V4-Flash-Vision-Exp and Seed 2.1 Pro?

DeepSeek-V4-Flash-Vision-Exp supports 1.0M 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.

What are the main differences between DeepSeek-V4-Flash-Vision-Exp and Seed 2.1 Pro?

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

Who makes DeepSeek-V4-Flash-Vision-Exp and Seed 2.1 Pro?

DeepSeek-V4-Flash-Vision-Exp is developed by DeepSeek and Seed 2.1 Pro is developed by ByteDance.

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