Seed 1.8
ByteDance's Seed 1.8 is a chat model capable of handling a wide range of tasks, including streaming, web search, code execution, and function calling, with extended thinking and structured output capabilities. It is genuinely best at handling complex, high-context conversations due to its large context window of 256,000 tokens.
Input
Output
Context
256K
Max Output
64K
Parameters
-
Technical Specifications
Input Modalities
Output Modalities
Capabilities
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Frequently asked questions about Seed 1.8
Answered from the entry's own fields: context, license, modalities, evidence, serving and the memory to self-host.
Seed 1.8 advertises a context window of 256,000 tokens, with a maximum output of 64,000 tokens in a single response. The figure is the creator's published maximum; a given host may serve less, and the gateway routes on what each host actually serves.
No. Seed 1.8 is a proprietary model (license: Proprietary): its weights are not distributed, and it runs only through ByteDance's own API or a host with access to it.
Seed 1.8 accepts Text, Image, Audio and Video and produces Text. The capabilities card on this page lists which API features each deployment honours, such as function calling and structured output, with the source each was checked against.
No published benchmark result for Seed 1.8 is in the catalog yet, so the model is shown as unmeasured. It is not ranked or estimated; the router treats it as unknown for every task until a suite measures it.
Yes. Seed 1.8 is served on the managed pool through the OpenAI-compatible endpoint as bytedance-seed-1-8, pinned by name or chosen by routing when it is the best fit for a request. The Try in Playground button opens it directly.
Seed 1.8 cannot be self-hosted: its weights are not distributed. It is used through an API, either ByteDance's own or the Inferbase gateway where it is served.
Fields collected from public registries, host APIs and benchmark publishers, each tagged with its source.
Last updated: Sep 22, 2026
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