AI Model Comparison
Side-by-side comparison of pricing, context window, benchmarks, capabilities, and license. Every figure comes from the developer's own pages, last checked on ; each model's page lists its sources. A figure we could not source shows as a dash.
Model A — Alibaba
Qwen3.8-Flash is a multimodal Qwen model with a million-token context window, aimed at coding assistance, agentic workflows and visual understanding. It is the hosted version of Qwen3.8-Flash-Next, which Qwen describes as an experimental preview of the architecture that will underpin Qwen4.
Model B — ByteDance Seed
Seed2.1 Pro is the larger model of ByteDance Seed's Seed2.1 family, which ByteDance describes as agent-capable models for real-world productivity, aimed at stronger reasoning, agentic execution and complex workflows. It is available to Doubao and Volcano Engine users as Doubao-Seed-2.1-Pro.
| Property | Qwen3.8-Flash | Seed2.1 Pro |
|---|---|---|
| Released | Aug 26, 2026 | Jun 23, 2026 |
| Developer | Alibaba | ByteDance Seed |
| Type | multimodal | multimodal |
| License | open-weight | proprietary |
| Context window | 1,000,000 | — |
| Parameters | 125B with 6B activated, plus 51B n-gram embedding and 4B MTP (open-weight base Qwen3.8-Flash-Next) | — |
| Developer status | — | — |
| Input $/M tokens | $0.15 | — |
| Output $/M tokens | $0.47 | — |
Bold green values indicate the winner on that dimension where comparison is meaningful (lower price wins; bigger context wins; more open license wins; newer date wins). Prices are the ones each developer lists today; a model it no longer prices has none.
Programmatic access available at /api/ai/compare?a=qwen-3-8-flash&b=seed-2-1-pro. CORS is open. Citation guidance: /about/editorial-process.