Vellum AI
Originally an enterprise LLM development platform (prompts, workflows, evals). It pivoted to a personal AI assistant (open-source vellum-assistant plus Vellum Cloud). Vellum announced its hosted Personal Assistant Platform will be shut down on 2026-11-02 and that it will no longer actively maintain the open-source repo.
Shut down · Verified 2026-10-29 · fresh as of 2026-10-29 · 14 cited facts, 2 with a third-party source · 1 recorded change · Suggest a correction
At a glance
- Type
- LLM dev platform (build + eval + deploy) vendor fix
- Tier
- T2
- Latest release
- v1.14.8 (2026-10-02) — vellum-ai (Python SDK) registry fix
- License
- proprietary; Python SDK MIT registry fix
- GitHub
- searched not found vendor fix
- Pricing
- searched not found fix
- Funding
- $5M seed 2023 (Y Combinator S23 + Rebel Fund + Eastlink). third-party fix
- Freshness
- 2026-10-29 fix
- Layer
- agent-infra repo fix
- Licensing
- commercial registry fix
When to use
Optimised for: searched not found
Anti-fit: searched not found
Pros & cons
Pros
searched not found
Cons
searched not found
Claims & capabilities
$5M seed; YC S23.
Technical surface
- API surface
- searched not found
- Backend storage
- not applicable — not a memory product
- Deployment
- searched not found
- Embedding model
- not applicable — not a memory product
- Multi-tenancy
- searched not found
- MCP
- searched not found
- A2A
- searched not found
- OpenTelemetry
- searched not found
Similar systems
Other evaluation & observability platforms in the catalog, ranked by inbound references.
- Arize Phoenix T1
Arize AI's open-source LLM observability tool — OpenTelemetry-native LLM tracing, evals, datasets. Arize commercial offers Phoenix + Surveyor.
- Arize AI T1
Production ML monitoring + LLM observability (Arize AX) — drift, eval, root-cause. Pre-LLM observability leader; now LLM-pivoted.
- Braintrust T1
Eval-first LLM platform — datasets, eval runs, prompt playground, tracing. Founded by ex-Impira (acquired by Dropbox) team. Used by Notion, Brex, AirOps.
- Confident AI / DeepEval T2
Open-source DeepEval framework + Confident AI cloud — pytest-style eval runs, hallucination/relevance/bias metrics, datasets.
- OpenLLMetry (Traceloop) T2
Traceloop's open-source OpenTelemetry auto-instrumentation for LLM workflows — works with any OTel-compatible backend (Datadog, New Relic, Grafana, etc.).
- Helicone T2
Open-source LLM observability and AI gateway — one-line proxy integration captures every LLM call; sessions, custom properties, evals. Acquired by Mintlify in Mar 2026 and placed in maintenance mode; helicone.ai now states it is no longer part of Mintlify.
Sources (13 cited facts, 2 third-party)
Each fact links to the page it came from; the badge says who published it (how to read sources).
- What it is LLM dev platform (build + eval + deploy) vendor
- What it does & what's distinct Originally an enterprise LLM development platform (prompts, workflows, evals). It pivote… vendor
- Claims / benefits $5M seed; YC S23. vendor
- Created 2023 vendor
- Latest release v1.14.8 (2026-10-02) — vellum-ai (Python SDK) registry
- License proprietary; Python SDK MIT registry
- Funding $5M seed 2023 (Y Combinator S23 + Rebel Fund + Eastlink). third-party
- Customers / scale Caribou, Drata, Headspace, OneStudyTeam, Anrok; LLM development platform. vendor
- HQ US vendor
- Founders / pedigree Akash Sharma (CEO), Sidd Seethepalli, Noa Flaherty; founded 2023 (YC S23). vendor
- adoption-accelerator yc-w23 third-party
- licensing-bucket commercial registry
- taxonomy-three-layer-rollup agent-infra repo
What changed
Changes to this record's lifecycle, licence, release, pricing and hosting facts, from the catalog's git history. Subscribe (Atom)