Seed 2.1 Pro

bytedance-seed· 2026-06-23· 256K ctx

API onlytool callreasoningstructured quant: unknown

spread (output)

1.3×

$3.54 – $4.45 · 2 providers

2 providers priced

Provider	Input	Output	Cache rd	Blended
Ofox relay router	$0.707	$3.54	$0.142	$0.605
Volcengine Ark relay router	$0.891	$4.45	$0.178	$0.761

Cheapest (output)

Ofox

$3.54 /M

opencode.json

{
  "provider": {
    "ofox": {
      "npm": "@ai-sdk/openai-compatible",
      "options": {
        "baseURL": "https://api.ofox.ai/v1"
      },
      "models": {
        "volcengine/doubao-seed-2.1-pro": {}
      }
    }
  }
}

Set OFOX_API_KEY in your environment. Generated — verify against the OpenCode docs.

Output $/M over time7-day preview

Median line, min–max band. Pre-2026-09 points are catalog-recorded dates from models.dev git history, not provider effective dates.

Full price history & dynamics

This is a 7-day preview. Sign in for 30 days free; the full series and export are the API subscription.

Data: models.dev (MIT), snapshot 2026-09-20. Prices are vendor-published; verify before purchase. Methodology.