> Seed 1.6 is a closed AI model from ByteDance, released 11 Jun 2025. API price $0.25 in / $2.0 out per million tokens, 262K context.

[Models](https://themodelindex.org/models/) /[ByteDance](https://themodelindex.org/labs/bytedance/)

# Seed 1.6

ByteDance

Released 11 Jun 2025

Closed

Reasoning

[Compare](https://themodelindex.org/compare/seed-1-6-vs-deepseek-r1-0528/)

–

Index score

Not yet evaluated independently

–

Core tests taken

no independent results yet

–

Versus the frontier at release

Replaced by [Seed 2.0](https://themodelindex.org/models/seed-2-0/)

$0.25/ $2.0

Price per million tokens

input / output, list price

262K

Context window

tokens it reads at once

## Where it sits · on the frontier

_Chart: Model Index score of every scored model since late 2022, with the best closed and best open model over time_

Not plotted: no index score yet.

## Test results · by area · tick = best by any model

Reasoning & knowledge

no evidence yet

GPQA Diamond

no result

Humanity's Last Exam

no result

Maths

no evidence yet

FrontierMath T1-3

no result

Coding

no evidence yet

SWE-bench Verified

no result

Terminal-Bench

no result

Agents

no evidence yet

APEX-Agents

no result

Novel problems

no evidence yet

ARC-AGI-2

no result

Long tasks

no evidence yet

METR time horizon

no result

Independent results from the Epoch AI benchmarking hub, best reasoning setting. The core tests are shown here; anchor tests also inform the score and can be shown above.

## What others say · rank on each leaderboard

Not on any of the rankings we follow yet.

Further left is better. Leaderboards measure different things: LMArena is people voting blind between two answers, the others are test scores. Click any row for the source.

## Best at · top three among current models

Replaced by Seed 2.0; it no longer leads any category among current models.

Where this model places in the top three of today's models, on category leaderboards and on our core tests.

## Where to use it · prices checked 1 Oct 2026

#### From the lab

Doubao

app · subscription

↗

#### API providers · 1 · per million tokens, in / out

S

Seed

$0.25 / $2.0 · fp8

cheapest

Provider prices come from OpenRouter's live listing; going direct to a provider can differ. Subscriptions are the lab's own apps.

## Facts and sources

Released

11 Jun 2025

Announcement

not linked yet

Release entry

Seed 1.6

Scored as

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Artificial Analysis index

–

Output speed

–

Hugging Face

closed weights

## ByteDance releases · around this one

Doubao Pro

Closed

15 MAY 2024

Doubao 1.5 Pro

Closed

22 JAN 2025

Seed 1.6

Closed

11 JUN 2025

Seed 2.0

Closed

14 FEB 2026

Seed 2.1

Closed

12 AUG 2026

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Source: https://themodelindex.org/models/seed-1-6/ · The Model Index · data as of 2026-10-01