Compare

Exa vs Lightning

Exa scores higher on the AgentReady, 92/100 against 57/100. 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

Exa. Exa is a custom search engine built for AIs, offering an API to search the largest index of public web and private information.

Lightning. Lightning AI is a platform for building, training and deploying AI models.

Where Exa is ahead

Exa passes clear canonical domain and mcp discoverable, and Lightning does not. That is discover, whether an agent can find the product at all without being told it exists.

It also holds understand: openapi / spec quality, authentication documented, request examples provided, response examples provided and errors and status codes documented. Lightning misses those.

And on adopt, programmatic credential creation and mcp integration available. Lightning misses those.

Finally, on operate, structured, predictable output, machine-readable errors, rate-limit behavior predictable and agent compatibility verified. Lightning misses those.

Where Lightning is ahead

Lightning passes agent-compatible signup flow, and Exa does not. That is adopt, whether an agent can get a key and make its first successful call without a human in the loop.

What neither does

Both fail no mandatory sales call, retry behavior documented, idempotency support. 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. Exa leads 100 to 80. Exa misses nothing; Lightning misses clear canonical domain, mcp discoverable.

Understand is whether an agent can read the docs and work out how the API behaves before calling it. Exa leads 100 to 46. Exa misses nothing; Lightning misses openapi / spec quality, authentication documented, request examples provided, response examples provided, errors and status codes documented.

Adopt. Exa leads 81 to 65. Exa misses no mandatory sales call, agent-compatible signup flow; Lightning misses no mandatory sales call, programmatic credential creation, mcp integration available.

Operate. Exa leads 88 to 35. Exa misses retry behavior documented, idempotency support; Lightning misses structured, predictable output, machine-readable errors, retry behavior documented, idempotency support, rate-limit behavior predictable, agent compatibility verified.

Pricing

Exa starts at $0 (free tier with credits) and has a free tier. Lightning starts at $4.50/hr and has a free tier.

Signal by signal

Which to pick

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

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