ByteDance Seed: Seed 1.6 Flash

bytedance-seed/seed-1.6-flash

Created Dec 23, 2025262,144 context

Starting at $0.075/M input tokensStarting at $0.30/M output tokens

Seed 1.6 Flash is an ultra-fast multimodal deep thinking model by ByteDance Seed, supporting both text and visual understanding. It features a 256k context window and can generate outputs of up to 16k tokens.

Providers for Seed 1.6 Flash

OpenRouter routes requests to the best providers that are able to handle your prompt size and parameters, with fallbacks to maximize uptime.

Performance for Seed 1.6 Flash

Compare different providers across OpenRouter

Apps using Seed 1.6 Flash

Top public apps this month

Recent activity on Seed 1.6 Flash

Total usage per day on OpenRouter

Prompt

2.09M

Reasoning

267K

Completion

146K

Prompt tokens measure input size. Reasoning tokens show internal thinking before a response. Completion tokens reflect total output length.

Uptime stats for Seed 1.6 Flash

Uptime stats for Seed 1.6 Flash across all providers

Sample code and API for Seed 1.6 Flash

OpenRouter normalizes requests and responses across providers for you.

OpenRouter supports reasoning-enabled models that can show their step-by-step thinking process. Use the reasoning parameter in your request to enable reasoning, and access the reasoning_details array in the response to see the model's internal reasoning before the final answer. When continuing a conversation, preserve the complete reasoning_details when passing messages back to the model so it can continue reasoning from where it left off. Learn more about reasoning tokens.

In the examples below, the OpenRouter-specific headers are optional. Setting them allows your app to appear on the OpenRouter leaderboards.

Using third-party SDKs

For information about using third-party SDKs and frameworks with OpenRouter, please see our frameworks documentation.

See the Request docs for all possible fields, and Parameters for explanations of specific sampling parameters.