Model

Seed 1.8

Name: Seed 1.8
Brand: bytedance-seed

ByteDance Seed model for multimodal reasoning, long-context analysis, and agent workflows

6 providers · 6 listingsreleased Dec 28, 2025closed weights

$0.119

lowest input /M · Volcengine Ark

$0.29

lowest output /M · Ofox

256K

context window

256K

max output

Compare providers (sorted by listed input price)

6 providers list Seed 1.8. The cheapest full-context option is Volcengine Ark at $0.119/$1.19 per M. Ofox lists lower but caps context at 256K.

			Cache read /M	Cache write /M		Capabilities
Volcengine Ark doubao-seed-1-8-251228	$0.119	$1.19	$0.024	—	256K	reasoningtoolsstructuredvision	Dec 28, 2025
Ofox volcengine/doubao-seed-1-8	$0.12	$0.29	$0.023	—	256K	reasoningtoolsstructuredvision	Dec 28, 2025
LLM Gateway bytedance/seed-1-8-251228	$0.25	$2	$0.05	—	256K	reasoningtoolsno structuredvision	Dec 18, 2025
Requesty seed-1.8	$0.25	$2	$0.05	—	256K	reasoningtoolsno structuredvision	May 27, 2026
Vercel AI Gateway bytedance/seed-1.8	$0.25	$2	$0.05	—	256K	reasoningtoolsno structuredno vision	Oct 1, 2025
DevPass (LLM Gateway) seed-1-8-251228	$0.25	$2	$0.05	—	256K	reasoningtoolsstructuredvision	Dec 18, 2025

Best price history

Daily lowest published price across live providers. A lower line is better for the buyer.

Best input /M: $0.12unchanged
Best output /M: $0.29unchanged
Provider coverage: 6; 5 at the start · 24 snapshots

Published best prices are unchanged.

24 daily snapshots collected from Aug 21, 2026 through Sep 14, 2026. A price chart will appear after the first real move.

Price badge

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Live SVG, regenerated on every hourly sync — paste it into a README to always show the current cheapest listed price. Updates when prices change; no build step needed on your side.

Recent changes

Changelog →

repricedvia requesty · Aug 28, 2026
- input: $0.225 → $0.25
- output: $1.80 → $2
- cache_read: $0.045 → $0.05
capabilityvia volcengine · Aug 28, 2026
- structured_output: — → true
capabilityvia ofox · Aug 28, 2026
- structured_output: — → true
capabilityvia ofox · Aug 27, 2026
- attachment: false → true
- modalities.input: text → text,image
capabilityvia volcengine · Aug 27, 2026
- attachment: false → true
- modalities.input: text → text,image
new providervia volcengine · Aug 26, 2026

Prices are per million tokens (USD). “—” means the provider does not publicly list a price for this model. Data from models.dev; verify with the provider before purchasing.