Seed 1.6 Flash
Summary
Seed 1.6 Flash is a proprietary language model from ByteDance Seed, released on 23 Dec 2025. It accepts images, text and video and generates text, with a 262K-token context window and up to 33K output tokens per response. As of 4 Oct 2026, the lowest listed API price is $0.07 per million input tokens and $0.30 per million output tokens (OpenRouter), across 1 provider we track. It is scheduled for retirement on 11 Nov 2026.
Multimodal reasoning model for visual analysis, planning, and tool use
Last verified 4 Oct 2026. Every figure on this page links to its source.
Specifications
| Developer | ByteDance Seed |
|---|---|
| Release date | 23 Dec 2025 [models.dev] |
| Status | Generally available [models.dev] |
| Weights | Proprietary (API only) [models.dev] |
| Context window | 262K (262,144 tokens) [models.dev] |
| Max output | 33K tokens [models.dev] |
| Input | Images, text and video [models.dev] |
| Output | Text [models.dev] |
| Reasoning mode | Yes [models.dev] |
| Tool calling | Yes [models.dev] |
| Structured output | Yes [models.dev] |
| Retirement date | 11 Nov 2026 [OpenRouter] |
Seed 1.6 Flash API pricing by provider
USD per million tokens. Sorted by input price.
| Provider | Input | Output | Cached input | Context | Source |
|---|---|---|---|---|---|
| OpenRouter bytedance-seed/seed-1.6-flash | $0.07 | $0.30 | – | 262K | OpenRouter, 4 Oct 2026 |
Frequently asked questions
What is the context window of Seed 1.6 Flash?
Seed 1.6 Flash has a context window of 262,144 tokens (262K) and can generate up to 32,768 tokens in a single response, according to models.dev.
How much does the Seed 1.6 Flash API cost?
Seed 1.6 Flash is listed from $0.07 per million input tokens and $0.30 per million output tokens (OpenRouter). Prices last verified 4 Oct 2026.
Is Seed 1.6 Flash open source?
No. Seed 1.6 Flash is a proprietary model; ByteDance Seed has not released its weights. It is available through APIs including OpenRouter.
When was Seed 1.6 Flash released?
ByteDance Seed released Seed 1.6 Flash on 23 Dec 2025, according to models.dev.
Change history
No changes detected since we started tracking this model. We re-check every source daily.