Seed 2.1 Pro vs Qwen3.8-Flash
Benchmark Performance
Available Benchmarks
Technical Differences
Side-by-Side Facts
| Field | Seed 2.1 Pro | Qwen3.8-Flash |
|---|---|---|
| Developer | ByteDance Seed | Qwen |
| Family | Seed 2 1 | Qwen3 8 Flash |
| Model | Seed 2.1 Pro | Qwen3.8-Flash |
| Version | Seed 2.1 Pro | Qwen3.8-Flash |
| Lifecycle | active | active |
| Released | 2026-06-23 | Unknown |
| Knowledge cutoff | Unknown | Unknown |
| Input modalities | Text, Image, Video | Text, Image, Video |
| Output modalities | Text | Text |
| Context window | Unknown | 1,000,000 |
| Total parameters | Unknown | Unknown |
| Active parameters | Unknown | Unknown |
| License | Unknown | Unknown |
| Open weights | No | No |
| API available | Yes | Yes |
| Self-hostable | No | No |
| Provider access | Unknown | Alibaba Cloud Model Studio (Standard), Openrouter (Standard), Together Ai (Standard) |
| Capabilities | agents, chat, computer-use, generation, reasoning, structured_outputs, tools | agents, chat, computer-use, reasoning, structured_outputs, tools, vision |
11 comparable fields · 5 material differences · Pair passes the primary-source comparison gate
Seed 2.1 Pro Capabilities
Qwen3.8-Flash Capabilities
Internal Comparison Graph
Related Comparisons
| A | Pair | B | Context |
|---|---|---|---|
Seed 2.1 ProByteDance Seed | vs | Seed 2.1 TurboByteDance Seed | family variantsimage, text, video |
Seed 2.0 ProByteDance Seed | vs | Seed 2.1 ProByteDance Seed | family variantsimage, text, video |
Qwen3.7-PlusQwen | vs | Qwen3.8-FlashQwen | family variantsimage, text, video |
Qwen3.8-FlashQwen | vs | Qwen3.8-MaxQwen | family variantsimage, text, video |
Qwen3.8-FlashQwen | vs |  GLM-5.3-FlashZ.ai | cross-developer peersimage, text, video |
Qwen3.7 FlashQwen | vs | Qwen3.8-FlashQwen | family variantsimage, text, video |
Qwen3.8-FlashQwen | vs | GLM-5V-TurboZ.ai | cross-developer peersimage, text, video |
Seed 2.0 LiteByteDance Seed | vs | Seed 2.1 ProByteDance Seed | family variantsimage, text, video |
Seed 2.0 ProByteDance Seed | vs | Qwen3.8-FlashQwen | cross-developer peersimage, text, video |
Seed 2.1 ProByteDance Seed | vs | Qwen3.7 FlashQwen | cross-developer peersimage, text, video |
Seed 2.1 ProByteDance Seed | vs | Qwen3.7 MaxQwen | cross-developer peersimage, text, video |
Seed 2.1 ProByteDance Seed | vs | Qwen3.7-PlusQwen | cross-developer peersimage, text, video |
Primary Evidence
Sources and Freshness
Questions
Seed 2.1 Pro vs Qwen3.8-Flash FAQs
Is Seed 2.1 Pro or Qwen3.8-Flash better for coding?+
This comparison does not currently contain a protocol-matched coding benchmark for both Seed 2.1 Pro and Qwen3.8-Flash, so Model Markets cannot name a coding leader from pricing, context size, or capability labels alone.
Which is cheaper, Seed 2.1 Pro or Qwen3.8-Flash?+
Only Qwen3.8-Flash has a directly sourced input price: $0.15 per million tokens. Only Qwen3.8-Flash has a directly sourced output price: $0.47 per million tokens.
Which has a larger context window, Seed 2.1 Pro or Qwen3.8-Flash?+
Neither model has a larger sourced context window in this comparison. Seed 2.1 Pro is — and Qwen3.8-Flash is 1,000,000.
Which performs better in benchmarks, Seed 2.1 Pro or Qwen3.8-Flash?+
There is no overall benchmark winner: At least two independently verified, protocol-matched benchmarks are required for an overall winner.
Can Seed 2.1 Pro or Qwen3.8-Flash be self-hosted?+
Both models have the same recorded self-hosting status: unsupported. Seed 2.1 Pro is not marked open weight; Qwen3.8-Flash is not marked open weight.
Can Seed 2.1 Pro and Qwen3.8-Flash understand images?+
Seed 2.1 Pro is documented with image input; Qwen3.8-Flash is documented with image input. This reflects supported input modalities, not vision quality.
Which can generate longer answers, Seed 2.1 Pro or Qwen3.8-Flash?+
Neither has a larger sourced maximum output. Seed 2.1 Pro is — and Qwen3.8-Flash is 131,072.
Do Seed 2.1 Pro and Qwen3.8-Flash support reasoning and tool use?+
Seed 2.1 Pro: reasoning, tool calling, and image input. Qwen3.8-Flash: reasoning, tool calling, and image input. Feature support does not establish relative quality.
Which is available from more inference providers, Seed 2.1 Pro or Qwen3.8-Flash?+
Seed 2.1 Pro has 0 sourced provider routes; Qwen3.8-Flash has 3, so Qwen3.8-Flash has broader tracked availability.
Which offers better value, Seed 2.1 Pro or Qwen3.8-Flash?+
There is no universal value winner. Compare the input and output prices above with the matched benchmark result for your workload: cheaper tokens can be offset by different quality, token usage, latency, or provider availability.