Modal vs Vellum
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Modal is a serverless platform for running Python in containers with built in scaling, web endpoints, scheduling, secrets and shared storage, priced as $0 plus usage with a monthly free compute credit on the Starter plan, aimed at ML inference batch jobs and data workflows.
Vellum is an AI agent building platform that combines a prompt playground, evaluation tools, and hosted agent apps so teams can iterate on LLM workflows with debugging and knowledge base support, starting with a free tier and upgrading for more credits.
Feature Tags Comparison
Key Features
- Usage based billing: Pay for compute while the function runs with a Starter plan that has $0 base fee and includes monthly free credits
- Web endpoints: Expose a deployed Python function over HTTP so non Python clients can call it as an API
- Crons and schedules: Run batch jobs on a schedule for ETL retraining or reports without keeping servers online
- Secrets management: Store credentials securely and inject them into containers via dashboard CLI or Python to avoid hardcoding keys
- Volumes storage: Use distributed volumes for write once read many assets like model weights shared across inference replicas
- Containerized functions: Package dependencies into images so your runtime is reproducible across local dev and production
- Free and Pro plans: Pricing starts at $0 with 50 credits and Pro at $25 with 200 builder credits so solo builders can scale testing
- Prompt playground: Compare models side by side and iterate prompts systematically instead of relying on subjective testing
- Evaluations framework: Run repeatable quality tests at scale to detect regressions and track improvements across prompt versions
- Hosted agent apps: Share working agents with teammates through hosted apps for demos
- reviews
- and stakeholder feedback cycles
Use Cases
- Inference API: Deploy a model as a web endpoint that scales with traffic and shuts down when idle to control cost
- Batch embedding jobs: Run scheduled batch workloads to generate embeddings or features without managing a long running cluster
- Data pipelines: Execute Python ETL steps on a cron schedule and persist outputs to volumes for downstream jobs
- Prototype to production: Turn a notebook experiment into a containerized function with the same dependencies and reproducible runs
- Internal tools: Build lightweight HTTP utilities around Python code for analytics ops or content pipelines
- Model weight hosting: Store large model artifacts in volumes and mount them into inference containers for faster startup
- Agent prototyping: Build an agent by chatting with AI then refine logic with low code steps and controlled prompt versions
- Prompt iteration: Compare LLM outputs side by side and select prompts that improve accuracy and reduce unwanted variation
- Regression testing: Run evaluations on a saved dataset before release to catch quality drops after model or prompt changes
- RAG apps: Attach a knowledge base and test retrieval behavior with representative questions and strict document scope rules
- Stakeholder demos: Publish hosted agent apps so product and compliance reviewers can test behavior without local setup steps
- Model selection: Evaluate providers and self hosted options with the same tasks to choose the best cost and latency mix for production
Perfect For
python developers, ml engineers, data engineers, backend engineers, startups building ML endpoints, teams running scheduled jobs, researchers shipping prototypes to production
product managers, ML engineers, software engineers, data scientists, AI platform teams, prompt engineers, QA and reliability teams, startups building LLM features, teams shipping agent workflows
Capabilities
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