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Cohere vs Letta

Letta scores higher on the AgentReady, 72/100 against 49/100. They differ on 12 of the 41 signals. Which ones decides whether an agent can adopt them without a person watching.

What each one is

Cohere. Cohere is an AI company providing enterprise-ready AI solutions that keep data and infrastructure under customer control.

Letta. Letta is an AI research lab in San Francisco building machines that learn.

Where Cohere is ahead

Cohere passes structured api reference, and Letta does not. That is understand, whether an agent can read the docs and work out how the API behaves before calling it.

Where Letta is ahead

Letta passes mcp discoverable, and Cohere does not. That is discover, whether an agent can find the product at all without being told it exists.

It also holds understand: authentication documented, pricing understandable and limits / constraints documented. Cohere misses those.

And on adopt, self-service signup, free trial or free allowance, fast time to first request, copyable quickstart, cli available and mcp integration available. Cohere misses those.

Finally, on operate, agent compatibility verified. Cohere misses it.

What neither does

Both fail openapi / spec quality, request examples provided, response examples provided, errors and status codes documented, no mandatory sales call, programmatic credential creation, machine-readable errors, retry behavior documented, idempotency support, rate-limit behavior predictable. 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. Letta leads 100 to 87. Cohere misses mcp discoverable; Letta misses nothing.

Understand. Letta leads 38 to 31. Cohere misses openapi / spec quality, authentication documented, pricing understandable, request examples provided, response examples provided, errors and status codes documented, limits / constraints documented; Letta misses structured api reference, openapi / spec quality, request examples provided, response examples provided, errors and status codes documented.

Adopt is whether an agent can get a key and make its first successful call without a human in the loop. Letta leads 81 to 30. Cohere misses self-service signup, no mandatory sales call, programmatic credential creation, free trial or free allowance, fast time to first request, copyable quickstart, cli available, mcp integration available; Letta misses no mandatory sales call, programmatic credential creation.

Operate. Letta leads 67 to 47. Cohere misses machine-readable errors, retry behavior documented, idempotency support, rate-limit behavior predictable, agent compatibility verified; Letta misses machine-readable errors, retry behavior documented, idempotency support, rate-limit behavior predictable.

Pricing

Cohere does not publish a machine-readable starting price. Letta starts at $0/mo and has a free tier.

Signal by signal

Which to pick

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

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