SWE-2 Flash vs. Seed2.1 Pro Comparison


SWE-2 Flash Cognition	Seed2.1 Pro ByteDance	+	+
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About SWE-2 Flash is an AI coding model developed by Cognition to provide fast, cost-efficient software engineering capabilities for autonomous development agents. Built on Thinking Machines' Inkling-Small foundation model, it uses mid-training and reinforcement learning to improve coding performance, reasoning, and task execution. The model supports software development activities such as code generation, code reviews, feature development, documentation updates, and automated engineering workflows. SWE-2 Flash generates approximately 200 tokens per second, making it three times faster and five times less expensive than the larger SWE-2 model. Its 276-billion-parameter mixture-of-experts architecture activates approximately 12 billion parameters during inference to balance performance and computational efficiency. SWE-2 Flash is available through Devin Desktop and CLI, with Cognition also developing a secure model-weight sharing program for trusted research and enterprise partners.	About Seed2.1 Pro is a next-generation AI productivity model built to handle complex, real-world work across general agents, code engineering, and multimodal understanding. It reliably executes multi-step tasks for high-value office work and everyday consultation, including project planning, file processing, research, tool use, spreadsheet analysis, lesson-plan slide generation, and industry report creation across tools and environments. In software development workflows, Seed2.1 Pro strengthens end-to-end delivery by improving requirement understanding, architecture design, coding, debugging, implementation, and validation. Its agent capabilities are designed to make steady progress on difficult tasks and return practical, verifiable results rather than isolated responses. The model also advances knowledge, reasoning, visual understanding, spatial reasoning, and long-context processing, giving agents a stronger foundation for complex decision-making and execution.
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	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
Audience Software developers, AI coding assistant users, software engineering teams, DevOps professionals, autonomous agent developers, AI researchers, enterprise development organizations, and cybersecurity researchers seeking fast, cost-efficient AI coding, automated code reviews, feature implementation, software maintenance, technical reasoning, and agentic development workflows	Audience AI teams seeking a multimodal agent model for complex productivity, coding, reasoning, tool use, and long-horizon tasks
Support Phone Support Not Supported 24/7 Live Support Not Supported Online Supported	Support Phone Support Not Supported 24/7 Live Support Not Supported Online Supported
API Offers API Not Supported	API Offers API Supported
Screenshots and Videos View more images or videos	Screenshots and Videos View more images or videos
Pricing $20/month Free Version Supported Free Trial Not Supported	Pricing No information available. Free Version Not Supported Free Trial Not Supported
Reviews/Ratings Overall 5.0 / 5 ease 5.0 / 5 features 5.0 / 5 design 5.0 / 5 support 5.0 / 5 Read all reviews	Reviews/Ratings Overall 0.0 / 5 ease 0.0 / 5 features 0.0 / 5 design 0.0 / 5 support 0.0 / 5 This software hasn't been reviewed yet. Be the first to provide a review: Review this Software
Pros & Cons from Real Users Pros This is the kind of model I would use all day for normal engineering work. It is fast enough that it does not feel like I am waiting on the model, but it is still strong enough for feature work, code review, docs, automations, and debugging. The speed is probably the biggest win. Cognition says it runs at around 200 tokens per second versus about 60 for SWE-2, and that difference matters a lot once an agent starts iterating through files and tools. The cost-performance balance is also really good. It is one-fifth the price of SWE-2, while scoring 45.5 on FrontierCode 1.1 Main, 60.1 on DeepSWE 1.1, and 89.9 on SWE-Bench Pro v2 Hard. Cons My main complaint is that it is not the model I would choose for the hardest repo-wide work. SWE-2 still has a noticeable edge on some tougher benchmarks, so I would move up when the task really needs it.
Training Documentation Supported Webinars Not Supported Live Online Not Supported In Person Not Supported	Training Documentation Supported Webinars Not Supported Live Online Not Supported In Person Not Supported
Company Information Cognition Founded: 2023 United States cognition.com	Company Information ByteDance Founded: 2012 China seed.bytedance.com/en/seed2_1
Alternatives Gemini 4 Carbon Google	Alternatives Gemini 4 Carbon Google
GPT-6.1 Terra OpenAI	GPT-6.1 Terra OpenAI
GPT-6.1 Sol OpenAI	GPT-6.1 Sol OpenAI
Inkling Thinking Machines Lab	Seed2.1 Turbo ByteDance
Nemotron 3.5 Super VL NVIDIA View All	Kimi K2.6 Moonshot AI View All
Categories AI Coding Models Supported AI Models Supported	Categories AI Coding Models Supported AI Models Supported AI Reasoning Models Supported AI Vision Models Supported Foundation Models Supported Large Language Models Supported Multimodal Models Supported

Integrations C++ Supported Claw Code Not Supported Dart Supported Devin Supported Doubao Not Supported Kilo Code Not Supported Lua Supported MATLAB Supported Objective-C Supported OpenRouter Not Supported PowerShell Supported Ruby Supported Rust Supported SQL Supported Scala Supported Solidity Supported Terraform Supported TypeScript Supported Volcano Engine Not Supported XML Supported Show More Integrations View All 32 Integrations	Integrations C++ Not Supported Claw Code Supported Dart Not Supported Devin Not Supported Doubao Supported Kilo Code Supported Lua Not Supported MATLAB Not Supported Objective-C Not Supported OpenRouter Supported PowerShell Not Supported Ruby Not Supported Rust Not Supported SQL Not Supported Scala Not Supported Solidity Not Supported Terraform Not Supported TypeScript Not Supported Volcano Engine Supported XML Not Supported Show More Integrations View All 7 Integrations
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