ByteDance

Seed 2.1 Pro

seed-2.1-pro

A flagship model for complex multimodal reasoning, coding, and agent applications.

Flagship ByteDance Seed 2.1 model for complex multimodal reasoning, coding, and agents

256K context256K context
Released2026-06-23
Relays5 sites
flagshipmultimodalreasoningcode generation

Model information

Model ID
seed-2.1-pro
Context
256K
Max input
-
Max output
256K
Knowledge cutoff
-
Open weights
Not supported
License
-
Release date
2026-06-23

Input

Text: SupportedImage: SupportedAudio: Not supportedVideo: SupportedPDF: Not supportedFile: Supported

Output

Text: SupportedImage: Not supportedAudio: Not supportedVideo: Not supported

API capabilities

Reasoning: SupportedTool call: SupportedStructured output: UnknownTemperature: Supported

ByteDance Official Pricing

CNY
Updated: 2026-10-04T22:55:09.902+08:00

Input

~¥5.955/ 1M tokens

Output

~¥29.773/ 1M tokens

Cache read

~¥1.191/ 1M tokens

Relay Comparison

Compare token, per-request, or per-second pricing by relay channel.

How should Seed 2.1 Pro relay pricing be compared?

This Seed 2.1 Pro pricing page compares official pricing with public prices from 5 listed AI gateways. Token prices are shown in CNY per 1M tokens, while per-request, per-second, and per-character rows use the unit shown in the table. Last updated: 11/08/2026, 08:14.

Data sources
Public price catalogs, official pricing records, and monitoring results.
Metric definitions
Uptime means successful probe response rate, fake-rate signals possible model mismatch or abnormal output risk, and latency is average API response time.
Risk note
Relay gateways are third-party services. Pricing, billing, privacy, and stability can change; start with a small top-up and verify reliability before continued use.