Engineering note: this post is based on limited samples and is focused on detectable failure modes, not benchmark rankings.

Different LLMs don’t just perform differently. Under the same multi-agent protocol constraints, they collaborate differently.

We ran 54 multi-agent sessions across 4 provider configurations under identical protocol constraints. The behavioral fingerprints were reproducible and revealed that protocol compliance (emitting the right signals in the right order) is a major differentiator in agentic settings.