seed-1.8
by ByteDance SeedChat
Optimized specifically for multimodal agent scenarios. It features enhanced agent capabilities, upgraded multimodal comprehension, and more flexible context management.
- Context
- 256K tokens
- Max output
- 64,000 tokens
- Released
- 2025-09-01
- Weights
- Closed
bytedance-seed/seed-1-8 · also seen as bytedance/seed-1.8, volcengine/doubao-seed-1-8
Specifications
Full facts as recorded, incl. what is unknown.
- Released
- 2025-09-01
- Weights
- Closed
- Input
- Text, Image
- Output
- Text
- Context window
- 256,000 max across endpoints
- Max output
- 64,000
- Providers
- 1 + 4 gateways, not counted as providers
- Epoch Capabilities Index
- not evaluated
- Direct price range
- $0.25 in · $2.00 out per 1M tokens · from its one provider
More details
- Last updated
- 2026-05-27
- Knowledge cutoff
- 2024-10
Capabilities
Across all endpoints: supported if any endpoint supports it.
- Tool calling
- Parallel toolsunknown
- Structured output
- Reasoning
- Image input
- PDF input
- Audio input
- Audio outputunknown
- Video input
- Prompt caching
- Web searchunknown
- Computer useunknown
- System messagesunknown
- Assistant prefillunknown
- Temperature
- Streamingunknown
- Attachments
Endpoints
One row per provider and variant; gateways are listed separately.
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Price history
Atom feedNo change since 19 Oct 2026. The cheapest direct price has been $0.25 in / $2.00 out per 1M tokens at Deep Infra on every data refresh since then.
Tracked from 19 Oct 2026, the earliest refresh this model's headline price can be rebuilt from. Headline-eligible direct prices only, so a price the sanity check flags never draws a spike. Series as JSON
Cost calculator
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Similarly priced models
Blended rate per 1M tokens, each at its own cheapest provider (10M input : 2M output mix).
| Model | Blended/1M | In/1M | Out/1M | Context | vs seed-1.8 |
|---|---|---|---|---|---|
| Hermes 2 Pro Llama 3 8BNous Research | $0.14 | $0.14 | $0.14 | 8.2K | +1% |
| Gemini 2.5 Flash-LiteGoogle | $0.135 | $0.09 | $0.36 | 1.05M | −2% cheaper |
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| Solar Pro 4Upstage | $0.135 | $0.09 | $0.36 | 524K | −2% cheaper |
| doubao-seed-1-8-251215ByteDance Seed | $0.143 | $0.114 | $0.286 | 224K | +3% |
| Gemma 4 31B Split-UntiedGoogle | $0.133 | $0.10 | $0.30 | 262K | −4% cheaper |
| Manta Pro 1.0MegaNova AI | $0.133 | $0.06 | $0.50 | 65.5K | −4% cheaper |
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