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Seed 1.8 (251228)
misc·misc/seed-1-8-251228·GA·Open weights·seed series
Multimodal reasoning model for visual analysis, planning, and tool use
At a glance
Reference price$0.25 / $2.00 per 1M
Cache read $0.05 · DevPass (LLM Gateway)
Lowest paid$0.25 / $2.00
DevPass (LLM Gateway) Gateway
Context256,000
Output limit8,192
Capabilities
✓ Reasoning✓ Tool use✓ Structured output✓ Temperature✓ Attachments
Modalities
TextImage
Knowledge cutoff—
Released / updated2025-12-18 / 2025-12-18
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 1 providers1 with public prices
| Provider | Tier | Input | Output | Cache read | Cache write | Context | Output limit | Status |
|---|---|---|---|---|---|---|---|---|
| DevPass (LLM Gateway) | Gateway | $0.25 | $2.00 | $0.05 | — | 256,000 | 8,192 |
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
1DevPass (LLM 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
effort = minimaleffort = loweffort = mediumeffort = high
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 listOutput listMin blended