ByteDance: Seed 1.6 (250915) (ByteDance)
Seed 1.6 (250915) (ByteDance) is a reasoning model from ByteDance released on Sep 15, 2025. It reads text and images and writes text, with a 256K token context window and up to 256K tokens per reply.
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It costs $0.25 per million input tokens and $2 per million output tokens. Cached input bills at $0.05, 80% less than fresh input.
It supports tool calling, structured JSON output and prompt caching, and its weights are open, so you can host it yourself.
2 providers serve it, including DevPass (LLM Gateway) and LLM Gateway.
- Modalities
- In / out price
- $0.25 / $2 per 1M
- Context
- 256K
- Max output
- 256K
- Released
- Sep 15, 2025
- Knowledge cutoff
- n/a
- Tool calling
- Structured output
- Reasoning
- Prompt caching
- Open weights
- Free to use
Seed 1.6 (250915) (ByteDance) pricing
USD, as listed on Oct 15, 2026. Most bills are input heavy, so the cached input rate matters as much as the headline price.
| Input | $0.25 / 1M tokens | |
|---|---|---|
| Output | $2 / 1M tokens | |
| Cached input (read) | $0.05 / 1M tokens | 80% off input |
Seed 1.6 (250915) (ByteDance) providers
2 providers serve it, including DevPass (LLM Gateway) and LLM Gateway. Each host sets its own price and limits, so the cheapest one is not always the one with the longest context.
| Provider | Input /M | Output /M | Cache read /M | Context | Max output |
|---|---|---|---|---|---|
| DevPass (LLM Gateway) | $0.25 | $2 | $0.05 | 256K | 8K |
| LLM Gateway | $0.25 | $2 | $0.05 | 256K | 256K |
What Seed 1.6 (250915) (ByteDance) costs per month
Pick a workload close to yours or type your own volumes.
Supported request parameters
What you can set when you call Seed 1.6 (250915) (ByteDance) through an OpenAI compatible API.
- Tools
tools - Structured outputs
structured_outputs - Reasoning
reasoning - Temperature
temperature
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Seed 1.6 (250915) (ByteDance) questions
How much does the Seed 1.6 (250915) (ByteDance) API cost?
$0.25 per million input tokens and $2 per million output tokens, with cached input at $0.05. The estimator on this page turns that into a monthly bill for your own workload.
What is the context window of Seed 1.6 (250915) (ByteDance)?
256,000 tokens of input, and it can write up to 256,000 tokens in one reply. As a rough guide, a million tokens is around 750,000 English words.
Which providers serve Seed 1.6 (250915) (ByteDance)?
2 providers serve it, including DevPass (LLM Gateway) and LLM Gateway. Prices differ by host, so the Providers table on this page lists each one with its input and output price.
Does Seed 1.6 (250915) (ByteDance) support tool calling?
Yes. It accepts tool definitions and can return JSON that matches a schema, which is what an agent needs to call your APIs.
Is Seed 1.6 (250915) (ByteDance) open source?
Its weights are published, so you can run it on your own hardware or a cloud of your choice. Read the license before commercial use.
When was Seed 1.6 (250915) (ByteDance) released?
Sep 15, 2025.
Catalog data from models.dev (MIT licensed), refreshed daily, last on Oct 15, 2026. The summary is written from these facts.