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Portkey vs Vellum

Vellum scores higher on the AgentReady, 88/100 against 63/100. They differ on 14 of the 41 signals. Which ones decides whether an agent can adopt them without a person watching.

What each one is

Portkey. Portkey is a comprehensive platform designed to streamline and enhance AI integration for developers and organizations.

Vellum. A personal AI assistant that lives in the secure Vellum Cloud, has its own identity, and actually does things in the world.

Where Portkey is ahead

Portkey passes authentication documented and limits / constraints documented, and Vellum does not. That is understand, whether an agent can read the docs and work out how the API behaves before calling it.

Where Vellum is ahead

Vellum passes llms-full.txt / full agent docs, and Portkey does not. That is discover, whether an agent can find the product at all without being told it exists.

It also holds understand: structured api reference, openapi / spec quality, request examples provided, response examples provided and errors and status codes documented. Portkey misses those.

And on adopt, programmatic credential creation, fast time to first request and copyable quickstart. Portkey misses those.

Finally, on operate, structured, predictable output, machine-readable errors and retry behavior documented. Portkey misses those.

What neither does

Both fail idempotency support, rate-limit behavior predictable, agent compatibility verified. If your agent needs any of those, you will be building it yourself either way.

Score, pillar by pillar

The AgentReady splits into four pillars, scored separately, because a product can be easy to find and still impossible to adopt.

Discover. Vellum leads 100 to 93. Portkey misses llms-full.txt / full agent docs; Vellum misses nothing.

Understand is whether an agent can read the docs and work out how the API behaves before calling it. Vellum leads 85 to 38. Portkey misses structured api reference, openapi / spec quality, request examples provided, response examples provided, errors and status codes documented; Vellum misses authentication documented, limits / constraints documented.

Adopt. Vellum leads 100 to 80. Portkey misses programmatic credential creation, fast time to first request, copyable quickstart; Vellum misses nothing.

Operate. Vellum leads 67 to 39. Portkey misses structured, predictable output, machine-readable errors, retry behavior documented, idempotency support, rate-limit behavior predictable, agent compatibility verified; Vellum misses idempotency support, rate-limit behavior predictable, agent compatibility verified.

Pricing

Portkey starts at $0/mo and has a free tier. Vellum starts at $30/mo and has a free tier.

Signal by signal

Which to pick

Vellum clears more of the signals an agent needs, so it is the safer default for unattended use. Full profiles: Portkey and Vellum. Alternatives to each: Portkey, Vellum.

An agent can fetch this as data: POST /v1/compare {"slugs": ["portkey", "vellum"]}