ByteDance Seed
Seed 1.8
Tool callingStructured outputReasoningImage input
ByteDance Seed model for multimodal reasoning, long-context analysis, and agent workflows
- Context
- 256K
- Released
- 9mo ago
Sources:models.dev
Benchmarks
DeepSWE is the primary coding benchmark where an exact model evaluation exists. Other sourced evaluations appear below; missing scores are not zero.
Not evaluated in DeepSWE 1.1 as of 2026-09-22. Results are only shown for exact model versions in the official dataset. Official leaderboard.
No benchmark results have been matched to this model yet.
Specifications
- Developer
- ByteDance Seed
- Model family
- Seed
- Type
- Language model
- Predecessor
- —
- Successor
- —
- Released
- December 28, 2025
- Model ID
bytedance-seed/seed-1-8- Openness
- Closed
- License
- —
- Input modalities
- text, image
- Output modalities
- text
- Modality
- text+image->text
- Max output tokens
- 64K
- Hugging Face
- —
- Source freshness
- Metadata synced Oct 8, 2026, 10:17 PM UTC
Additional source evidence
- Source model
- bytedance-seed/seed-1-8
- Source family
- seed
- Last updated
- 2025-12-28
- Model context
- 256K
- Model output limit
- 64K
- Open weights
- No
- File attachments
- Yes
- Reasoning
- Yes
- Tool calling
- Yes
- Structured output
- Yes
- Temperature control
- Yes
Complete source record (JSON)
{
"id": "bytedance-seed/seed-1-8",
"name": "Seed 1.8",
"description": "ByteDance Seed model for multimodal reasoning, long-context analysis, and agent workflows",
"family": "seed",
"last_updated": "2025-12-28",
"attachment": true,
"reasoning": true,
"tool_call": true,
"structured_output": true,
"temperature": true,
"modalities": {
"input": [
"text",
"image"
],
"output": [
"text"
]
},
"limit": {
"context": 256000,
"output": 64000
},
"release_date": "2025-12-28",
"open_weights": false
}Infrastructure
Provider availability
Provider endpoint data will appear after this model's first OpenRouter endpoint sync.