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 — 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.
Model B — StepFun
Step 3.7 Flash is StepFun's open-weight vision-language Mixture-of-Experts model, 198B parameters with about 11B active per token, built for high-throughput agent workloads. It supports a 256k context and three reasoning levels.
| Property | Seed2.1 Pro | Step 3.7 Flash |
|---|---|---|
| Released | Jun 23, 2026 | May 29, 2026 |
| Developer | ByteDance Seed | StepFun |
| Type | multimodal | multimodal |
| License | proprietary | open-weight |
| Context window | — | — |
| Parameters | — | 198B total (196B language backbone + 1.8B vision encoder), about 11B activated per token |
| Developer status | — | — |
| Input $/M tokens | — | $0.20 |
| Output $/M tokens | — | $1.15 |
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=seed-2-1-pro&b=step-3-7-flash. CORS is open. Citation guidance: /about/editorial-process.