Where memory comes from
- How memories are created
- flmnt:
Authored by your agents as they work
- Letta:
Agent-managed notes
- Decisions, causes & mistakes as first-class types
- flmnt:
✓
- Letta:
—
- Nothing guessed after the fact
- flmnt:
✓
- Letta:
partial
agent-written
Currency — what's true now
- Serves the current decision after a reversal
- flmnt:
✓
- Letta:
—
- Supersession test (no textual tell)
- flmnt:
1.00
- Letta:
—
- Reversed decisions served as history, never truth
- flmnt:
✓
- Letta:
—
- Causal lineage — the why behind each decision
- flmnt:
✓
- Letta:
—
- Tracks whether mistakes stop repeating
- flmnt:
✓
- Letta:
—
Recall — what was said
- Semantic recall over history
- flmnt:
✓
- Letta:
✓
- Session-to-session persistence
- flmnt:
✓
- Letta:
✓
Economics
- Cost per query as the corpus grows
- flmnt:
Flat — $0.0077 measured
- Letta:
Grows with context
- Live ROI ledger, per deployment
- flmnt:
✓
- Letta:
—
Trust & fit
- Public benchmark, run every release
- flmnt:
✓
- Letta:
—
- MCP-native — no SDK, no rewrite
- flmnt:
✓
- Letta:
Framework adoption
- Immutable, replayable record
- flmnt:
✓
- Letta:
—
Entries reflect Letta's published approach as of July 2026 — corrections welcome, and the full matrix covers every tool side by side.
See the full comparison across every tool →