Seed1.8 is a large language model from ByteDance Seed, released on December 18, 2025. It accepts text, image and video input.

When was Seed1.8 released?

ByteDance Seed released Seed1.8 on December 18, 2025.

How much does Seed1.8 cost?

Seed1.8 costs $0.25 per 1M input tokens and $2 per 1M output tokens through the ByteDance Seed API. Cached input costs $0.05 per 1M tokens. Prices are from ByteDance Seed's official pricing as of October 5, 2026.

What is Seed1.8's context window?

Seed1.8 has a 256K-token context window and can generate up to 64K output tokens.

How does Seed1.8 score on benchmarks?

Seed1.8 has 16 cited benchmark scores, including AIME-25 94.3%, ARC-AGI-1 67.9% and BFCL-v4 57.2%. Each score links to its source.

Seed1.8

ByteDance Seed·Pending·Released 2025-12-18textvisionvideo

Context256k

Max output64k

Input / 1M$0.25 ↗

Output / 1M$2 ↗

Cached in$0.05

Benchmarks16

Benchmarks

Cited public sources · rank is exact-benchmark, apples-to-apples

AIME-25

94.3% ↗

ARC-AGI-1

#2/267.9% ↗

BFCL-v4

57.2% ↗

BrowseComp-en

67.6% ↗

GPQA-Diamond

#3/883.8% ↗

HLE (text-only, agentic search)

40.9% ↗

LiveCodeBench(v6)

79.5% ↗

MM-BrowseComp

46.3% ↗

MMLU-pro

84.9% ↗

Multi-SWE-Bench

#1/442% ↗

MultiChallenge

#2/566.7% ↗

OSWorld-Verified (XLANG)

#10/1361.9% ↗

SWE-Bench Verified

#3/372.9% ↗

Terminal Bench 2.0

#2/245.2% ↗

WideSearch

#5/563.8% ↗

τ2-Bench

72% ↗

Compare

vs Gemini 4 Argon vs GPT-6.1 Sol vs Claude Sonnet 5.5 vs Muse Spark 1.3 vs GPT-6 Sol vs GPT-6 Luna vs Claude Opus 5.5 vs GPT-6 Astra

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Seed1.8 FAQ

What is Seed1.8?: Seed1.8 is a large language model from ByteDance Seed, released on December 18, 2025. It accepts text, image and video input.
When was Seed1.8 released?: ByteDance Seed released Seed1.8 on December 18, 2025.
How much does Seed1.8 cost?: Seed1.8 costs $0.25 per 1M input tokens and $2 per 1M output tokens through the ByteDance Seed API. Cached input costs $0.05 per 1M tokens. Prices are from ByteDance Seed's official pricing as of October 5, 2026.
What is Seed1.8's context window?: Seed1.8 has a 256K-token context window and can generate up to 64K output tokens.
How does Seed1.8 score on benchmarks?: Seed1.8 has 16 cited benchmark scores, including AIME-25 94.3%, ARC-AGI-1 67.9% and BFCL-v4 57.2%. Each score links to its source.

Access Seed1.8 and every other model through one endpoint with automatic failover: Respan gateway.