Models

Doubao Seed 1.6 vs Step 3.7 Flash

Compare Doubao Seed 1.6 from ByteDance and Step 3.7 Flash from StepFun on key metrics including benchmarks, price, context length, and other model features. Access both models and hundreds of others through the AIHubMix API.

ByteDanceDoubao Seed 1.6StepFunStep 3.7 Flash
ByteDance logo
Doubao Seed 1.6
ByteDance · text, image, video → text

Doubao-Seed-1.6 is a brand new multimodal deep reasoning model that supports four types of reasoning effort: minimal, low, medium, and high. It offers stronger model performance, serving complex tasks and challenging scenarios. It supports a 256k context window, with output length up to a maximum of 32k tokens.

Input$0.18 /M
Output$1.8 /M
StepFun logo
Step 3.7 Flash
StepFun · text, image, video → text

step-3.7-flash is stepfun's flagship inference model, designed for high-complexity tasks that require deep reasoning and fast execution. It excels at decomposing multi-step problems, performing tool calls, and maintaining consistency across massive datasets. It is the preferred choice for complex workloads such as long-context agents, advanced software engineering, and end-to-end research automation.

Input$0.22 /M
Output$1.32 /M
Cache read$0.044 /M

Pricing & Specifications

Prices are per million tokens. Time to First Token and throughput are rolling averages measured on AIHubMix.

Doubao Seed 1.6
Step 3.7 Flash
Input /M
$0.18
$0.22
Output /M
$1.8
$1.32
Cache read /M
-
$0.044
Context length
256,000
256,000
Max output
32,000
0
Time to First Token
-
1.4 s
Throughput
-
32.6 tok/s
Modalities
textimagevideo
textimagevideo
Supported Parameters
thinkingtoolsfunction callingstructured outputs
API Formats
Released
October 15, 2025
May 29, 2026

Promotional prices show the discounted rate; see each model page for promotion windows.

Activity Past 30 Days

Daily traffic served through AIHubMix — how demand for each model is trending.

doubao-seed-1-6step-3.7-flash

Tokens / day

-

Requests / day

-

Performance Past 3 Days

Measured on real AIHubMix traffic, hourly buckets. Gaps mean no traffic in that hour.

doubao-seed-1-6step-3.7-flash

Throughput (tok/s)

-

TTFT (s)

-

Uptime (%)

-

Cost calculator

Estimate your monthly bill for the same workload on each model.

Step 3.7 Flash
$33.00 /mo
Doubao Seed 1.6
$37.80 /mo

Monthly = daily × 30. Discounted rates applied where a promotion is active.

FAQ

Which is cheaper: Doubao Seed 1.6, Step 3.7 Flash?

Step 3.7 Flash: $1.32/M output tokens; Doubao Seed 1.6: $1.8/M. Use the cost calculator above to estimate your own workload.

How large is each context window?

Doubao Seed 1.6 accepts 256,000 and Step 3.7 Flash accepts 256,000 input tokens.

What inputs and capabilities does each model support?

Doubao Seed 1.6 accepts text, image and video input and supports thinking, tool calling, function calling and structured outputs; Step 3.7 Flash accepts text, image and video input.

Can I call Doubao Seed 1.6 and Step 3.7 Flash with the same API key?

Yes. AIHubMix serves every model on this page behind one OpenAI-compatible endpoint, so switching between them is a one-line change to the model field — no second account, key or SDK.

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