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Three releases in one week point at the same constraint: frontier models now reason well and still fail at the handoff. The teams winning are the ones treating the interface as the hard problem.
Anthropic's flagship Fable model is losing ground to cheaper alternatives because sophisticated teams have discovered that a better harness plus a good-enough model beats a great model at premium prices.
Mastra's latest release restores agent state without re-reading the whole conversation. The fix exposes a cost problem most agent users never knew they were paying: every resumed thread re-bills the entire history.
Mastra's new notification-inbox system lets agents send you persistent, priority-ranked messages that survive across sessions. The framing is mundane; the implication is that agents are quietly becoming collaborators you check on, not tools you run.
