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Favicon for bytedance-seed

ByteDance Seed: Seed 1.6 Flash

Going away November 11, 2026

bytedance-seed/seed-1.6-flash

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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.

Modalities
In / Out Price
$0.075 / $0.30per 1M
Context
262K
Released
Dec 23, 2025
Compare
ProvidersPricingPerformanceUptimeAppsActivityFAQExplore

Providers

This model is hosted by one provider. OpenRouter forwards every request to it directly — no routing decisions to make.

Pricing

The average price customers actually pay for this model, next to the prices providers post. Caching and discounts mean the price actually paid is often well below the listed one.

Performance

Throughput is how fast the model writes (tokens per second — higher is better). Latency is total round-trip time (lower is better). TTFT is time-to-first-token — how long before you see anything appear (lower is better).

Uptime

Uptime is the percentage of the past 3 days that at least one provider was responding to requests. Availability is the percentage of time that inference was successfully served. OpenRouter continuously monitors and uses the next-best provider when one returns an error.

Apps

Public apps that send the most traffic to this model. Good signal for what real production workloads look like — and a hint at which use cases this model is best suited for.

Activity

Token volume and request traffic to this model over time.

API

Drop-in code to call this model. OpenRouter's API is OpenAI-compatible — most SDKs work by just swapping the base URL. The only thing that changes between models is the model slug below.

Not currently available through EU in-region routing. In-region routing docs

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Latency / throughput
$0.075$0.300.40s63 tps
100.00%
Throughput
63tok/s

P50, best across providers

Latency
0.40s

P50, best provider

Uptime (3d)The model was reachable. Request routed to a provider.
100.00%
Availability (3d)The model returned inference from any provider. Errors and empty responses count against it.
99.75%

Availability over the last 3 days

Last 72 hours
Availability 99.75%
3 Days Ago2 Days AgoYesterdayNow

Availability over the last 24 hours

OpenRouter Availability
99.84%

When an error occurs in an upstream provider, we can recover by routing to another healthy provider, if your request filters allow it. You can access per-provider uptime data programmatically through the Endpoints API. Learn more about our load balancing and provider routing options.

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Frequently asked questions

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.

Seed 1.6 Flash costs $0.075/M input tokens and $0.30/M output tokens.

Seed 1.6 Flash has a 262,144 token context window. It supports up to 32,768 completion tokens.

Yes. Seed 1.6 Flash accepts tools and tool_choice for function calling. It also supports structured outputs via a JSON schema in response_format.

Seed 1.6 Flash accepts images, text, and video as input and returns text.

Seed 2.1 Turbo, Seed-2.0-Code, Seed-2.0-Lite and 2 more are other text models from ByteDance Seed.

Seed 1.6 Flash was released on December 23, 2025.