Step 3.5 FlashStepFun
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Related Products
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Inkling-Small:
About
Inkling-Small is an efficient model that offers performance comparable to Inkling at a quarter of its size. It is a Mixture-of-Experts transformer with 276 billion total parameters and 12 billion active parameters, trained on NVIDIA GB300 NVL72 systems. It supports native reasoning across text, images, and audio, variable thinking effort, and context windows of up to one million tokens. Users adjust reasoning effort from minimal to extra high to balance performance and compute. Improved pre-training data, post-training with on-policy distillation from Inkling, and extended agentic coding reinforcement learning helped Inkling-Small surpass its larger counterpart on reasoning and coding benchmarks. It performs well in coding and tool-use harnesses, exceeds 80% on SWE-bench Verified, and combines strong reasoning with efficient output. Its encoder-free multimodal architecture processes audio as dMel spectrograms and images as 40-by-40-pixel patches alongside text tokens.
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Step 3.5 Flash:
About
Step 3.5 Flash is an advanced open source foundation language model engineered for frontier reasoning and agentic capabilities with exceptional efficiency, built on a sparse Mixture of Experts (MoE) architecture that selectively activates only about 11 billion of its ~196 billion parameters per token to deliver high-density intelligence and real-time responsiveness. Its 3-way Multi-Token Prediction (MTP-3) enables generation throughput in the hundreds of tokens per second for complex multi-step reasoning chains and task execution, and it supports efficient long contexts with a hybrid sliding window attention approach that reduces computational overhead across large datasets or codebases. It demonstrates robust performance on benchmarks for reasoning, coding, and agentic tasks, rivaling or exceeding many larger proprietary models, and includes a scalable reinforcement learning framework for consistent self-improvement.
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Inkling-Small:
Platforms Supported
Windows
Not Supported
Mac
Not Supported
Linux
Not Supported
Cloud
Supported
On-Premises
Not Supported
iPhone
Not Supported
iPad
Not Supported
Android
Not Supported
Chromebook
Not Supported
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Step 3.5 Flash:
Platforms Supported
Windows
Not Supported
Mac
Not Supported
Linux
Not Supported
Cloud
Supported
On-Premises
Not Supported
iPhone
Supported
iPad
Supported
Android
Supported
Chromebook
Not Supported
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Inkling-Small:
Audience
AI researchers and developers seeking an efficient open-weight multimodal model for reasoning, agentic tasks, and lower-cost deployment
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Step 3.5 Flash:
Audience
Developers, researchers, and AI engineers who want a powerful open source foundational AI model capable of fast, deep reasoning, coding assistance, and agentic task execution
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Inkling-Small:
Support
Phone Support
Not Supported
24/7 Live Support
Not Supported
Online
Supported
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Step 3.5 Flash:
Support
Phone Support
Not Supported
24/7 Live Support
Not Supported
Online
Supported
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Inkling-Small:
API
Offers API
Supported
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Step 3.5 Flash:
API
Offers API
Supported
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Inkling-Small:
Screenshots and Videos |
Step 3.5 Flash:
Screenshots and Videos |
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Inkling-Small:
Pricing
$0.30 per million input tokens
$0.30 per million input tokens and $1.20 per million output tokens
Free Version
Not Supported
Free Trial
Not Supported
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Step 3.5 Flash:
Pricing
Free
Free Version
Supported
Free Trial
Not Supported
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Inkling-Small:
Reviews/
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Step 3.5 Flash:
Reviews/
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Inkling-Small:
Pros & Cons from Real UsersPros
Cons
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Inkling-Small:
Training
Documentation
Supported
Webinars
Not Supported
Live Online
Not Supported
In Person
Not Supported
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Step 3.5 Flash:
Training
Documentation
Supported
Webinars
Not Supported
Live Online
Not Supported
In Person
Not Supported
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Inkling-Small:
Company InformationThinking Machines Lab
Founded: 2025
United States
thinkingmachines.ai/news/inkling-small/
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Step 3.5 Flash:
Company InformationStepFun
Founded: 2023
China
static.stepfun.com/blog/step-3.5-flash/
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Inkling-Small:
Alternatives |
Step 3.5 Flash:
Alternatives |
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Step 3.5 Flash:
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Inkling-Small:
Categories |
Step 3.5 Flash:
Categories |
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Inkling-Small:
Integrations
GitHub
Not Supported
Hugging Face
Not Supported
Model Context Protocol (MCP)
Supported
ModelScope
Not Supported
Tinker
Supported
arXiv
Not Supported
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Step 3.5 Flash:
Integrations
GitHub
Supported
Hugging Face
Supported
Model Context Protocol (MCP)
Not Supported
ModelScope
Supported
Tinker
Not Supported
arXiv
Supported
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Inkling-Small:
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Step 3.5 Flash:
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