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Seed 1.8
bytedance-seed·bytedance-seed/seed-1-8·GA·Closed·seed series
ByteDance Seed model for multimodal reasoning, long-context analysis, and agent workflows
At a glance
Reference price$0.25 / $2.00 per 1M
Cache read $0.05 · Vercel AI Gateway
Lowest paid$0.12 / $0.29
Ofox Gateway · 2.1× spread
Context256,000
Output limit64,000
Capabilities
✓ Reasoning✓ Tool useStructured output✓ TemperatureAttachments
⚠ Providers report capability flags inconsistently
Modalities
TextImage
Knowledge cutoff2024-10
Released / updated2025-12-28 / 2025-12-28
Quality & performance
Artificial Analysis doesn't cover this model (267 of 2059 have data). Quality data comes from independent evals covering widely used models.
Available at 3 providers3 with public prices
| Provider | Tier | Input | Output | Cache read | Cache write | Context | Output limit | Status |
|---|---|---|---|---|---|---|---|---|
| Ofox volcengine/doubao-seed-1-8 | Gateway | $0.12 | $0.29 | $0.023 | — | 256,000 | 64,000 | |
| Requesty seed-1.8 | Gateway | $0.225 | $1.80 | $0.045 | — | 256,000 | 256,000 | |
| Vercel AI Gateway bytedance/seed-1.8 | Cloud | $0.25 | $2.00 | $0.05 | — | 256,000 | 64,000 |
Sorted by blended price (input×0.75 + output×0.25) asc. The official channel always shows regardless of rank. Whether a gateway's low price is actually usable can't be verified.
Your usage cost
1Ofox$26.86
2Requesty$113.40
3Vercel AI Gateway$126.00
The cheapest paid channel is the only channel.
Benchmark
No upstream benchmark data for this model. For quality, see the Artificial Analysis intelligence score above.
Reasoning control
Toggle (on / off)effort = noneeffort = loweffort = mediumeffort = higheffort = maxbudget_tokenseffort = minimal
Related models
ByteDance Seed 2.1 Turbosame series$0.50 / $2.50ByteDance Seed: Seed 2.1 Turbosame series$0.50 / $2.50Seedance 2.5same series—DeepSeek V4 Flashcheaper alternative$0.14 / $0.28GPT-5 Nanocheaper alternative$0.05 / $0.40GLM-4.7-Flashcheaper alternative$0 / $0MiMo-V2.5cheaper alternative$0.14 / $0.28
Price historyone sample accumulated per data sync
Input list $0.25Output list $2.00Min blended $0.163
Price history accumulates from each data sync; currently only 1 sample(s) (2026-08-15). Each future sync adds a point, and once accumulated a line is drawn here.