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Letta vs Together AI

Letta scores higher on the AgentReady, 72/100 against 46/100. They differ on 11 of the 41 signals. Which ones decides whether an agent can adopt them without a person watching.

What each one is

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

Together AI. Full-stack AI platform, powered by cutting-edge research

Where Letta is ahead

Letta passes search discoverable, clear product positioning and mcp discoverable, and Together AI 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 and limits / constraints documented. Together AI misses those.

And on adopt, agent-compatible signup flow, cli available and mcp integration available. Together AI misses those.

Finally, on operate, structured, predictable output and agent compatibility verified. Together AI misses those.

Where Together AI is ahead

Together AI 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.

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 is whether an agent can find the product at all without being told it exists. Letta leads 100 to 60. Letta misses nothing; Together AI misses search discoverable, clear product positioning, mcp discoverable.

Understand. Both sit at 38/100 here. Letta misses structured api reference, openapi / spec quality, request examples provided, response examples provided, errors and status codes documented; Together AI misses openapi / spec quality, authentication documented, request examples provided, response examples provided, errors and status codes documented, limits / constraints documented.

Adopt. Letta leads 81 to 52. Letta misses no mandatory sales call, programmatic credential creation; Together AI misses no mandatory sales call, agent-compatible signup flow, programmatic credential creation, cli available, mcp integration available.

Operate. Letta leads 67 to 35. Letta misses machine-readable errors, retry behavior documented, idempotency support, rate-limit behavior predictable; Together AI misses structured, predictable output, machine-readable errors, retry behavior documented, idempotency support, rate-limit behavior predictable, agent compatibility verified.

Pricing

Letta starts at $0/mo and has a free tier. Together AI starts at $0.00 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: Letta and Together AI. Alternatives to each: Letta, Together AI.

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