AutoGen (AG2) alternatives
The highest-scoring alternative to AutoGen (AG2) is Vellum at 88/100 on the AgentReady, against 53/100 for AutoGen (AG2).
All scored in Agent Frameworks & Runtimes.
What Vellum does that AutoGen (AG2) does not
Vellum passes structured api reference, openapi / spec quality, request examples provided, response examples provided, errors and status codes documented, self-service signup, no mandatory sales call, programmatic credential creation, fast time to first request, cli available, structured, predictable output, machine-readable errors, retry behavior documented, and AutoGen (AG2) fails them. That is the whole of the gap between the two scores, so if none of those matter to your agent the ranking above overstates the difference.
Why people look for an alternative
AutoGen (AG2) fails structured api reference, openapi / spec quality, authentication documented, request examples provided, response examples provided, errors and status codes documented, limits / constraints documented, self-service signup, no mandatory sales call, programmatic credential creation, fast time to first request, cli available, structured, predictable output, machine-readable errors, retry behavior documented, idempotency support, rate-limit behavior predictable, agent compatibility verified. Each one is a place an unattended run stops, which is usually what sends someone looking in the first place.
Where AutoGen (AG2) loses the points
| Pillar | AutoGen (AG2) | What it measures |
|---|---|---|
| Discover | 100 | Can an agent find it at all: sitemap, robots, structured data. |
| Understand | 23 | Is there a spec, an llms.txt, a machine-readable description. |
| Adopt | 55 | Signup, keys, SDKs, and whether a human has to be involved. |
| Operate | 35 | Rate-limit headers, errors, status, and behaviour under load. |
AutoGen (AG2) is weakest on understand at 23/100. Without a spec an agent has to guess at endpoints, and it guesses wrong. If that is the part your agent depends on, take the ranking above seriously; if it is not, AutoGen (AG2) may still be the right pick.
What an agent runs into with AutoGen (AG2)
These are the findings from the last audit on 2026-08-23. Each one is a place unattended software stops, which is the practical reason to look at the list above.
- Make signup self-serve; an agent cannot sit through a sales call.
- Publish an OpenAPI spec so agents can generate a client.
- Flesh out the OpenAPI: paths, schemas, and descriptions.
- Document error responses as an enum in your OpenAPI.
- Let agents create API keys programmatically.
- Return X-RateLimit / Retry-After headers so agents pace themselves.
- Add request examples to your API reference.
- Add response examples to your API reference.
What this category actually supports
Across the 18 products scored in Agent Frameworks & Runtimes, build an agent is offered by 61%, orchestrate agents is offered by 22%, agent memory is offered by 0%. Anything under half is a gap you should expect to fill yourself whichever one you pick.
An agent can get this list directly: resolve("alternative to AutoGen (AG2)") over the MCP server, or GET /v1/categories/agent-frameworks.