Hidden Chain-of-Thought Logic
The model generates an internal reasoning trace to verify logic before responding, significantly reducing hallucinations in multi-step math and legal queries.
Doubao Seed 1.6 Thinking (Build 250615)
The Doubao Seed 1.6 Thinking API brings elite logic and 256k context to your workflow. Built by ByteDance, it uses hidden Chain-of-Thought reasoning to solve complex STEM and coding problems with precision and cost-efficiency on GPTProto.com.
API Usage Examples
curl --request POST "https://gptproto.com/v1/chat/completions" \
--header "Authorization: Bearer $GPTPROTO_API_KEY" \
--header "Content-Type: application/json" \
--data '{
"model": "doubao-seed-1-6-thinking-250615",
"messages": [
{
"role": "user",
"content": "Hello"
}
]
}'Doubao Seed 1.6 Thinking 250615 pricing
Chat, coding agents & document work. Priced per 1M tokens — input, cached input and output are billed separately. GPTProto is 15% below official rates.
Your usage
Bytedance · ≈ 100M tokens/mo (0M cached)
OpenRouter
List + 5.5% credit fee
$33.75
per month
Input (non-cached)$9.6384
Output$24.11
Bytedance
Direct from Bytedance (list price)
$31.99
per month
Input (non-cached)$9.1359
Output$22.86
BEST VALUE
GPTProto
15% off official
$27.20
per month
After discount$27.20
Effective$27.20
Monthly cost by source
OpenRouter
$33.75
Bytedance
$31.99
GPTProto
$27.20
Save $4.80 / month
on GPTProto vs Bytedance (−15%)
Annual savings ≈ $57.55 · pay as you go
GPTProto applies a per-model discount (10–30% off official) on top of bonus credits — every unit costs less than going direct.
Related Models
All Models
| Model | Input → Output | ||||
|---|---|---|---|---|---|
| 262K | $0.10 / $0.97 per 1M | — | Input: TextInput: Image Output: Text | |
| — | — | $0.30 / $1.20 per 1M | — / $0.006 per 1M | Input: TextInput: Image Output: Text | |
| 1.05M | $0.79 / $2.38 per 1M | — / $0.04 per 1M | Input: Text Output: Text | ||
| 1.05M | $8.00 / $40.00 per 1M | $10.00 / $0.80 per 1M | Input: TextInput: ImageInput: Document Output: Text | ||
| 1.05M | $0.90 / $4.50 per 1M | $0.60 / $0.09 per 1M | Input: TextInput: ImageInput: VideoInput: DocumentInput: Audio Output: Text | ||
| 1M | $9.00 / $45.00 per 1M | $11.25 / $0.23 per 1M | Input: TextInput: ImageInput: Document Output: Text | ||
| 1M | $1.80 / $5.40 per 1M | $2.25 / $0.23 per 1M | Input: TextInput: ImageInput: VideoInput: DocumentInput: Audio Output: Text | ||
| — | 1.31M | $0.15 / $0.50 per 1M | — / $0.03 per 1M | Input: TextInput: ImageInput: VideoInput: Document Output: Text | |
| — | 1.05M | $0.30 / $1.20 per 1M | — / $0.006 per 1M | Input: TextInput: Image Output: Text | |
| 1.31M | $1.26 / $3.96 per 1M | — / $0.23 per 1M | Input: TextInput: ImageInput: Document Output: Text | ||
| 1.05M | $0.90 / $4.50 per 1M | $0.60 / $0.09 per 1M | Input: TextInput: ImageInput: Document Output: Text | ||
| 500K | $1.20 / $3.60 per 1M | — / $0.30 per 1M | Input: TextInput: Image Output: Text | ||
| 1M | $1.80 / $5.40 per 1M | $2.25 / $0.23 per 1M | Input: TextInput: ImageInput: VideoInput: Document Output: Text | ||
| 1M | $4.50 / $22.50 per 1M | $5.63 / $0.45 per 1M | Input: TextInput: ImageInput: Document Output: Text | ||
| 1.05M | $0.90 / $4.50 per 1M | $0.60 / $0.09 per 1M | Input: TextInput: ImageInput: Document Output: Text | ||
| 1.05M | $2.70 / $13.50 per 1M | $0.27 / $0.27 per 1M | Input: TextInput: ImageInput: Document Output: Text | ||
| 1.05M | $0.16 / $0.96 per 1M | $0.20 / $0.02 per 1M | Input: TextInput: ImageInput: Document Output: Text | ||
| 1.05M | $1.60 / $9.60 per 1M | $2.00 / $0.16 per 1M | Input: TextInput: ImageInput: Document Output: Text | ||
| 500K | $1.20 / $3.60 per 1M | $0.30 / $0.30 per 1M | Input: TextInput: Image Output: Text | ||
| 1M | $1.80 / $9.00 per 1M | $2.25 / $0.18 per 1M | Input: TextInput: Document Output: Text | ||
| 1.05M | $0.48 / $0.96 per 1M | $0.10 / $0.10 per 1M | Input: TextInput: ImageInput: Document Output: Text | ||
| 1.05M | $1.26 / $3.96 per 1M | $0.23 / $0.23 per 1M | Input: TextInput: ImageInput: Document Output: Text | ||
| 1M | $0.36 / $1.44 per 1M | $0.07 / $0.07 per 1M | Input: TextInput: Document Output: Text | ||
| — | 1.05M | $0.30 / $1.20 per 1M | — / $0.006 per 1M | Input: Text Output: Text | |
| 1M | $0.75 / $1.50 per 1M | $0.12 / $0.12 per 1M | Input: TextInput: Image Output: Text | ||
| 262K | $0.85 / $3.60 per 1M | $0.14 / $0.14 per 1M | Input: TextInput: Document Output: Text | ||
| 205K | $0.24 / $0.96 per 1M | $0.30 / $0.02 per 1M | Input: TextInput: Document Output: Text | ||
| 262K | $0.54 / $2.70 per 1M | $0.09 / $0.09 per 1M | Input: TextInput: Document Output: Text | ||
| 262K | $0.10 / $0.97 per 1M | — | Input: TextInput: Image Output: Text | ||
| 262K | $0.02 / $0.18 per 1M | — | Input: TextInput: Image Output: Text | ||
| 262K | $0.10 / $0.24 per 1M | — | Input: TextInput: Image Output: Text | ||
| — | $0.10 / $0.24 per 1M | — | Input: Text Output: Text | ||
| — | $0.36 / $1.09 per 1M | — | Input: TextInput: Image Output: Text |
Doubao Seed 1.6 Thinking API Features
Standout technical capabilities of the 1.6 seed version for advanced AI development.
92.5% MATH Benchmark Score
Specifically tuned for Olympiad-level mathematics, the model maintains high accuracy on AIME and AMC-level problems with pedagogical precision.
256k Long-Context Handling
Process massive repositories or 100-page documents with a 256,000 token window, perfect for deep architectural coding and complex data extraction.
Cost-Effective Agentic Planning
Decompose high-level goals into tool calls at 1/10th the cost of proprietary models, making it the ideal brain for multi-step agentic workflows.
Doubao Seed 1.6 Thinking API Questions
Common inquiries regarding the 1.6 seed thinking model capabilities, pricing, and integration.
Why use Doubao Seed 1.6 Thinking API for coding?
The Doubao Seed 1.6 Thinking API excels at architectural coding tasks. Unlike lite models, it can refactor large-scale repositories, identify subtle edge cases in distributed systems, and write unit tests for complex logic with a 94.2% HumanEval success rate. Its internal reasoning allows it to plan code structures before writing, ensuring higher pedagogical accuracy and fewer bugs in multi-file software engineering projects.
How does Doubao Seed 1.6 Thinking API pricing work?
Pricing for the Doubao Seed 1.6 Thinking API is highly competitive at $0.15 per 1M input tokens and $0.60 per 1M output tokens. It is important to note that you are billed for total output, which includes the hidden reasoning tokens generated during the 'thinking' phase. Despite this, it remains roughly 1/10th the cost of comparable high-reasoning models like the o1-preview, offering massive savings for enterprise-scale agents.
What is the context window for this 1.6 seed model?
This model features a 256,000 token context window, allowing for the processing of massive datasets. It is ideal for extracting structured entities from messy, 100-plus page legal or financial documents where context-sensitive interpretation is required. The high capacity ensures that the model maintains coherence and 'remembers' details across extremely long conversations or large codebase audits without losing logical thread.
Is the Doubao Seed 1.6 Thinking API OpenAI-compatible?
Yes, the Doubao Seed 1.6 Thinking API is fully OpenAI-compatible. Developers can easily migrate by swapping the base URL and model name in their existing SDK setup. It supports standard parameters like temperature, top_p, and max_tokens. We recommend a temperature of 0.7 to 1.0 to allow the internal Chain-of-Thought process to explore optimal reasoning paths, and streaming is supported to improve user experience during the thinking phase.
Why is the latency higher for the 1.6 thinking model?
Because the model 'thinks' before speaking, the Time To First Token (TTFT) is higher than standard models, typically ranging from 3 to 10 seconds. This delay is the result of the hidden reasoning phase where the model verifies logic and solves multi-step problems internally. While not ideal for simple chatbots, this latency is a necessary trade-off for the extreme accuracy required in math proofs and complex scientific research.
Does Doubao Seed 1.6 handle multimodal inputs?
Yes, the Doubao Seed 1.6 Thinking API supports multimodal inputs, including text and images. This allows it to reason through visual data, such as reading complex charts or identifying errors in architectural diagrams, and then apply its logical thinking process to provide a detailed analysis. It is especially strong at interpreting visual information within the context of mathematical or technical instructions.
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