Seed 1.8

bytedance-seed· 2025-12-28· 256K ctx

API onlytool callreasoning quant: unknown

spread (output)

6.9×

$0.290 – $2.00 · 6 providers

6 providers priced

Provider	Input	Output	Cache rd	Blended
Ofox relay router	$0.120	$0.290	$0.023	$0.074
Volcengine Arktiered relay router	$0.119	$1.19	$0.024	$0.156
DevPass (LLM Gateway) relay router	$0.250	$2.00	$0.050	$0.282
LLM Gateway relay router	$0.250	$2.00	$0.050	$0.282
Requesty relay router	$0.250	$2.00	$0.050	$0.282
Vercel AI Gateway unknown	$0.250	$2.00	$0.050	$0.282

Cheapest (output)

Ofox

$0.290 /M

opencode.json

{
  "provider": {
    "ofox": {
      "npm": "@ai-sdk/openai-compatible",
      "options": {
        "baseURL": "https://api.ofox.ai/v1"
      },
      "models": {
        "volcengine/doubao-seed-1-8": {}
      }
    }
  }
}

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.