Seed 1.8
Seed 1.8 is worth evaluating for rag, agents, and long context when its provider route and context window match the workload.
Use it for
- Teams evaluating rag, agents, and long context
- Workloads that can use a 256k context window
- Buyers comparing 1 tracked provider route
Do not use it for
- Workloads where another current model has stronger sourced task evidence
- Family
- Seed
- Released
- 2025-12-18
- Context
- 256k
- Max output
- 64,000
- Openness
- Proprietary
- License
- ProprietaryCommercial use: conditional
Cheapest of 1 route · Volcengine · cache read $0.050
About
Seed 1.8 (Doubao 1.8) is ByteDance Seed's generalized agentic model released December 18, 2025. It supports multimodal text and image input with configurable chain-of-thought thinking modes. Strengths include GUI agent tasks across desktop/web/mobile, BrowseComp-en benchmark (67.6), code generation, and video understanding. Available via Volcengine (BytePlus) API with a 256K context window, max 64K output tokens. GitHub repository is Apache-2.0 licensed but weights are not publicly available.
Seed 1.8 is a proprietary model in the Seed family. The structured metadata tracks a 256k-token context window, multimodal input, reasoning, function calling, tool use, and structured outputs. This page tracks provider routes through Volcengine, with the cheapest tracked route listed at $0.25 input and $2 output per 1M tokens. No headline benchmark score is tracked for Seed 1.8 yet.
Top use-case fit: coding, agents, and build tasks
RAG
Included by capability and metadata signals in the decision map.
Agents
Included by capability and metadata signals in the decision map.
Long context
Included by capability and metadata signals in the decision map.
Provider price ladder
Compare API pricing across 1 providers for input and output tokens, batch, and cached reads when available.
| Provider | Input / 1M | Output / 1M | Cache | Route |
|---|---|---|---|---|
| Volcengine | $0.250 | $2.00 | read $0.050 | Serverless |
Capabilities
Benchmark peer barsfor RAG
No task-mapped benchmark peers are available for this model yet.
Migration checks
No linked migration route is available for this model yet.
Cheapest of 1 route · Volcengine · cache read $0.050