ByteDance Seed: Seed Evolving
Seed Evolving is a reasoning model from ByteDance Seed released on Jun 23, 2026. It reads text, images and video and writes text, with a 256K token context window and up to 256K tokens per reply.
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It costs $0.8906 per million input tokens and $4.45 per million output tokens. Cached input bills at $0.1781, 80% less than fresh input.
It supports tool calling, structured JSON output and prompt caching.
2 providers serve it, including Volcengine Ark and Ofox. The lowest input price is $0.884 per million tokens at Ofox.
- Modalities
- In / out price
- $0.8906 / $4.45 per 1M
- Context
- 256K
- Max output
- 256K
- Released
- Jun 23, 2026
- Knowledge cutoff
- n/a
- Tool calling
- Structured output
- Reasoning
- Prompt caching
- Open weights
- Free to use
Seed Evolving 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 | $0.8906 / 1M tokens | |
|---|---|---|
| Output | $4.45 / 1M tokens | |
| Cached input (read) | $0.1781 / 1M tokens | 80% off input |
Seed Evolving providers
2 providers serve it, including Volcengine Ark and Ofox. The lowest input price is $0.884 per million tokens at Ofox. 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 |
|---|---|---|---|---|---|
| Volcengine Ark | $0.8906 | $4.45 | $0.1781 | 256K | 256K |
| Ofox | $0.884 | $4.42 | $0.177 | 256K | 256K |
What Seed Evolving 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 Evolving through an OpenAI compatible API.
- Tools
tools - Structured outputs
structured_outputs - Reasoning
reasoning - Temperature
temperature
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Seed Evolving questions
How much does the Seed Evolving API cost?
$0.8906 per million input tokens and $4.45 per million output tokens, with cached input at $0.1781. The estimator on this page turns that into a monthly bill for your own workload.
What is the context window of Seed Evolving?
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 Evolving?
2 providers serve it, including Volcengine Ark and Ofox. The lowest input price is $0.884 per million tokens at Ofox. Prices differ by host, so the Providers table on this page lists each one with its input and output price.
Does Seed Evolving 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 Evolving open source?
No. ByteDance Seed serves it through an API only, so you cannot download the weights or host it yourself.
When was Seed Evolving released?
Jun 23, 2026.
Catalog data from models.dev (MIT licensed), refreshed daily, last on Oct 15, 2026. The summary is written from these facts.
Building on Seed Evolving?
I test your real tasks on it and the two closest alternatives, then ship the agent on whichever wins on cost and accuracy.
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