Comet alternatives
The highest-scoring alternative to Comet is Exa at 92/100 on the AgentReady, against 68/100 for Comet.
All scored in AI Models & Inference.
What Exa does that Comet does not
Exa passes openapi / spec quality, authentication documented, request examples provided, response examples provided, errors and status codes documented, limits / constraints documented, programmatic credential creation, structured, predictable output, machine-readable errors, rate-limit behavior predictable, and Comet 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
Comet fails openapi / spec quality, authentication documented, request examples provided, response examples provided, errors and status codes documented, limits / constraints documented, no mandatory sales call, programmatic credential creation, structured, predictable output, machine-readable errors, retry behavior documented, idempotency support, rate-limit behavior predictable. Each one is a place an unattended run stops, which is usually what sends someone looking in the first place.
What this category actually supports
Across the 36 products scored in AI Models & Inference, generate text is offered by 36%, understand images is offered by 17%, transcribe audio is offered by 14%, call tools / functions is offered by 8%. 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 Comet") over the MCP server, or GET /v1/categories/ai-models.