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What is SWE-2?

SWE-2 is Cognition’s coding model for software engineering agents, developed to improve the balance between capability, reasoning cost, and execution efficiency. The model is post-trained from Kimi K3, a multi-trillion-parameter model that had already received extensive reinforcement learning for agentic coding. Cognition further trained SWE-2 with a reinforcement learning algorithm that optimizes several reasoning-effort levels during a single training run. These effort levels let users trade off speed and cost against deeper planning, codebase exploration, and verification for more difficult assignments. SWE-2 is designed to reduce the over-exploration seen in earlier models by identifying relevant files and implementation paths more quickly. Its software engineering abilities include repository analysis, code writing and editing, debugging, testing, build and lint workflows, terminal tasks, and verification of completed work. The model places additional emphasis on writing end-to-end tests, catching edge cases and regressions, and gathering evidence instead of simply accepting assumptions in a prompt. Cognition’s training approach also uses cost penalties tied to the model’s performance frontier, length-weighted reward baselines, speculative decoding improvements, low-precision inference techniques, and expanded reinforcement learning data. Training data includes more diverse repositories, additional instruction-following requirements, and iterative verifier improvements designed to reduce reward hacking and false validation. SWE-2 is benchmarked against models such as GPT-6 Astra, GPT-5.6 Sol, Fable 5.1, Grok 4.6, and Kimi K3, with Cognition positioning it around strong coding performance at substantially lower cost. SWE-2 is intended for use across Cognition’s Devin ecosystem, including Desktop and CLI, with rollout to Devin Web and Fusion.

What is Lumen Outpost?

Lumen Outpost exemplifies the advanced coding model developed by Cosine, which has been meticulously assessed in comparison to its foundational model, Kimi K2.6, as well as other versions like GPT-5.5, GPT-5.4, and Gemini 3.1 Pro, with a particular emphasis on complex, long-term coding tasks across a range of 13 programming languages. This model is crafted not only to achieve high accuracy in coding but also to improve essential behavioral metrics that are crucial in engineering practices, including agent initiative, strategic foresight, scope management, consistency in actions, concise updates, and robust communication. Cosine's benchmarking revealed that the tailored post-training led to a significant enhancement in the performance of the base model, with Lumen Outpost outperforming Kimi K2.6 in various assessments such as Niche-Bench, Slop-Bench, and Vibe-Bench, as well as demonstrating greater cost-effectiveness in completing tasks successfully. In the Niche-Bench evaluation, which focuses on niche, legacy, and environmentally constrained programming languages, Lumen Outpost achieved a notable score of 53.9%, excelling or matching performance in nine of the thirteen languages tested, with particularly significant improvements observed in Fortran, ABAP, Java, and Rust. These outstanding results reflect a considerable advancement in the real-world applicability of coding models, highlighting the advantages of specialized training approaches and their impact on engineering efficiency. Such progress not only validates the effectiveness of these targeted training methodologies but also sets a new benchmark for future developments in coding technologies.

Media

Media

Integrations Supported

Rust
.NET
C
C#
Cerebras
Dart
Devin Desktop
Go
JSON
Kubernetes
MATLAB
Objective-C
Python
R
Scala
Solidity
Swift
XML

Integrations Supported

Rust
ABAP
Fortran

API Availability

API Availability

Pricing Information

$20/month
Free Version

Pricing Information

$20 per month

Supported Platforms

SaaS

Supported Platforms

Windows
Mac
Linux

Customer Service / Support

Web-Based Support

Customer Service / Support

Web-Based Support

Training Options

Documentation Hub

Training Options

Documentation Hub

Company Facts

Organization Name

Cognition

Date Founded

2023

Company Location

United States

Company Website

cognition.com

Company Facts

Organization Name

Cosine

Company Location

United Kingdom

Company Website

cosine.sh/blog/lumen-outpost-benchmark-report

Categories and Features

AI Coding Models

Not specified

AI Models

Not specified

Categories and Features

AI Coding Models

Not specified

AI Models

Not specified

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