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About

Lumen Outpost is Cosine’s targeted post-trained coding model, benchmarked against Kimi K2.6, its base model, GPT-5.5, GPT-5.4, and Gemini 3.1 Pro on highly complex, long-horizon coding tasks across 13 programming languages. The model is specialized not only for raw coding accuracy, but also for behavioral signals that matter in professional engineering workflows, including agent initiative, planning, scope discipline, action alignment, concise updates, and useful communication. Cosine’s benchmark report shows that highly targeted post-training transformed the base model’s capabilities, with Lumen Outpost outperforming Kimi K2.6 across Niche-Bench, Slop-Bench, Vibe-Bench, and cost per successful task. On Niche-Bench, an internal evaluation for niche, legacy, and environment-constrained programming languages, Lumen Outpost achieved a 53.9% score and led or tied in 9 of 13 assessed languages, with notable gains in Fortran, ABAP, Java, and Rust.

About

Mistral Medium 3.5 is a flagship 128B dense model that merges instruction-following, reasoning, and coding into a single set of weights. It has a 256K context window, configurable reasoning effort, multimodal input, strong agentic capabilities, and is built for long-horizon tasks that require reliable multi-tool use and structured outputs. The model powers remote agents in Mistral Vibe, allowing coding sessions to run in the cloud, work through long tasks independently, and execute multiple sessions in parallel. Agents can be launched from the Vibe CLI or Le Chat, with local CLI sessions moved to the cloud while preserving history, task state, and approvals. Users can inspect file diffs, tool calls, progress states, and questions as work proceeds. Each coding session runs in an isolated sandbox and can handle module refactors, test generation, dependency upgrades, CI investigations, and bug fixes, then open a GitHub pull request for review.

Platforms Supported

Windows Supported
Mac Supported
Linux Supported
Cloud Not 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 Supported
iPad Supported
Android Supported
Chromebook Not Supported

Audience

Professional engineering teams that need a cost-efficient AI coding model for complex, long-horizon software tasks across mainstream and niche programming languages

Audience

Developers, engineering teams, and knowledge workers seeking to delegate coding, research, and cross-tool workflows to autonomous cloud-based AI agents

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 Not Supported

Screenshots and Videos

Screenshots and Videos

Pricing

$20 per month
Free Version Not Supported
Free Trial Not Supported

Pricing

$14.99 per month
Free Version Supported
Free Trial Not Supported

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

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

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

Cosine
United Kingdom
cosine.sh/blog/lumen-outpost-benchmark-report

Company Information

Mistral AI
Founded: 2023
France
mistral.ai/news/vibe-remote-agents-mistral-medium-3-5/

Alternatives

GLM-5

GLM-5

Z.ai

Alternatives

Mistral Vibe

Mistral Vibe

Mistral AI
Composer 2

Composer 2

Cursor
Mistral Small 4

Mistral Small 4

Mistral AI
GLM-5.1

GLM-5.1

Z.ai
GLM-5.3

GLM-5.3

Z.ai
Mistral Large

Mistral Large

Mistral AI

Categories

AI Coding Models Supported
AI Models Supported

Categories

AI Models Supported

Integrations

ABAP Supported
Fortran Supported
GitHub Not Supported
Java Supported
Jira Not Supported
Linear Not Supported
Microsoft Teams Not Supported
Rust Supported
Sentry Not Supported
Slack Not Supported

Integrations

ABAP Not Supported
Fortran Not Supported
GitHub Supported
Java Not Supported
Jira Supported
Linear Supported
Microsoft Teams Supported
Rust Not Supported
Sentry Supported
Slack Supported
Claim Lumen Outpost and update features and information
Claim Lumen Outpost and update features and information
Claim Mistral Medium 3.5 and update features and information
Claim Mistral Medium 3.5 and update features and information