CAD Skills vs Instruct 2.5: Features, Pricing & Which Is Better (2026)
A side-by-side comparison of CAD Skills and Instruct 2.5 — features, pricing, and ideal use cases — to help you decide which AI tool fits your workflow.
C
CAD Skills
earthtojake
Open-source library of agent skills for CAD, robotics, fabrication, and simulation — generate STEP/STL, URDF/SRDF/SDF, DXF, and slicer G-code from prompts.
Key features
- Prompt-to-CAD Generation: The CAD skill creates and edits parametric CAD models from natural language or image requests, exporting to STEP, STL, 3MF, and GLB.
- URDF Robot Description: Writes robot structure files with links, joints, limits, inertials, and meshes ready for ROS-based stacks.
- SRDF for MoveIt2: Adds planning groups, end effectors, named poses, and collision rules on top of a URDF for MoveIt2 planning.
- SDF Simulation Worlds: Creates simulator models and worlds with frames, physics, sensors, and lights.
- 2D DXF Drawings: Produces cut-ready DXF profiles, templates, gaskets, and layouts from Python or CAD geometry.
- G-code Slicing: Slices supported mesh files into validated, printer-profiled FDM G-code using real slicer CLIs.
- Bambu Lab Print Jobs: Dry runs, uploads, and cautiously starts local Bambu Lab prints from validated G-code.
- CAD Viewer Previews: Local browser previews for CAD, G-code, URDF, and other robot files for fast agent iteration.
Best for
- Agentic Mechanical Design: Let a coding agent iterate on brackets, flanges, and enclosures directly from natural-language specs.
- Robot Description Authoring: Generate URDF/SRDF/SDF files for new robot arms or mobile bases without hand-writing XML.
- Rapid Prototyping: Take a CAD model to sliced, printer-ready G-code and kick off a Bambu Lab print from within an agent workflow.
- Custom Part Fabrication: Produce DXF/STEP files pre-checked for SendCutSend, then order laser-cut or CNC parts.
- Simulation Setup: Author SDF worlds for physics simulators with the right frames, sensors, and lighting for robotics research.
- Off-the-Shelf Sourcing: Use step.parts to pull ready-made STEP models for common hardware like screws, bearings, and connectors.
Instruct 2.5
Qwen
Instruction-tuned Qwen2.5 series models optimized for improved instruction-following, long-context, multilingual, math and multimodal tasks.
Key features
- Instruction Tuning: Models are fine-tuned to follow user directions more reliably, improving instruction-following behavior, role-play consistency, and condition-setting in chats.
- Multi-Scale Model Family: Available in multiple sizes (examples include 1.5B, 3B, 7B and much larger math-specialized variants) to balance inference cost and capability for different deployments.
- Long-Context Support: Certain Qwen2.5 variants support extended context lengths (documented support up to 128K tokens for some configurations) enabling long-document generation, summarization, and analysis.
- Multimodal Inputs & Image Resolution Controls: Vision–language Instruct variants accept image inputs and allow configurable resolution/tokenization ranges to trade off performance and compute.
- Math and Expert Variants: Math-specialized Qwen2.5-Math-Instruct models deliver state-of-the-art performance on mathematical benchmarks and competition-style problems.
- Structured Output & JSON Generation: Improved ability to understand structured data (tables) and to produce structured outputs (e.g., JSON), useful for downstream automation and integrations.
- Improved Coding Capabilities: Expert models and instruction tuning enhance code generation, autocompletion and reasoning about programming tasks compared to prior releases.
- Multilingual Coverage: Trained for and evaluated across dozens of languages (reported support for 29+ languages), enabling multilingual assistant use cases.
- Instruction-tuned variants optimized for following human prompts and role-play
- Multiple model sizes and expert variants (e.g., 1.5B, 7B, 72B, Math-specialized, VL)
- Long-context support up to 128K tokens (context) and generation up to ~8K tokens reported
- Multimodal image + text inputs with configurable resolution and pixel ranges
- High-performing math-specialist models (e.g., Qwen2.5-Math-72B-Instruct) with CoT and ranking modes
- Support for structured output generation (JSON, tables) and improved handling of structured data
- Batch inference examples and tooling (Hugging Face model endpoints, local PT/CUDA runtimes, GGUF)
- Community training/fine-tuning scripts and Docker-based setups (uv installation referenced)
- Evaluation modes and decoding strategies supported: Greedy, Majority@N, RM@N, TIR, CoT
- Open-source model distributions hosted on Hugging Face (model repos, GGUF builds) and community forks
Best for
- Automated Math Problem Solving: Deploy math-specialized Instruct variants to solve competition-style problems, step-by-step reasoning, and graded numeric tasks where high mathematical fidelity is required.
- Code Generation and Assistance: Use 7B+ instruct-tuned models for code authoring, autocompletion, refactoring suggestions, and multi-file code reasoning in developer tools and IDE integrations.
- Multimodal Understanding: Run vision-language Instruct models to answer questions about images, extract structured information from images and text, and build multimodal assistants.
- Long-Document Summarization and Analysis: Leverage extended context support to summarize, analyze, and extract insights from very long documents or collections of documents.
- Structured Data Extraction: Convert unstructured text or table inputs into JSON/structured outputs for automation, data pipelines, and downstream system integration.
- Multilingual Conversational Agents: Build chatbots and virtual assistants capable of robust instruction following across many languages and diverse user prompts.
- Instruction-following chatbots and virtual assistants
- Complex math problem solving and competition-style reasoning
- Code generation, code understanding and editor integration (autocompletion / coder workflows)
- Multimodal tasks: image captioning, image-question answering and combined text+image workflows
- Long-document QA, summarization and document-level analysis with very long contexts
- Structured-data extraction and generation (JSON outputs, table understanding)
- Batch inference pipelines for research and production deployments