[A] Cognee (93.0)
VS
[B] Letta (MemGPT) (92.0)
Cognee vs Letta (MemGPT): 2026 Empirical Benchmark & TCO Shootout
DIRECT ANSWER (93.0 vs 92.0): Cognee wins on modular Extract-Cognify-Load (ECL) graph+vector pipelines that plug into any existing agent (93.0), while Letta wins on OS-style self-editing core/archival memory tiers and stateful agent servers (92.0).
1. Velocity (30)
28.0 vs 26.5
2. Quality (25)
23.4 vs 23.3
3. Efficiency (25)
22.9 vs 23.8
4. Privacy/SLA (20)
18.7 vs 18.4
Live Head-to-Head Scoreboard
SWE-bench + Polyglot Rig
Cognee93.0
topoteretes/cognee
Open-Source / Usage-Based
Letta (MemGPT)92.0
letta-ai/letta
Open-Source / BYOK API
Velocity Advantage:Cognee (+1.5 pts)
Token/RAM Efficiency:Letta (MemGPT) (+0.9 pts)
WORKLOAD, REPO & TOKEN VOLUME WORKBENCH
Configure Team Token Volume & GitHub Repo Security Scan
LIVE SIDE-BY-SIDE COST, LATENCY & SWE-BENCH MATRIX
Claude 3.7 Sonnet vs. Gemini 2.5 Pro vs. DeepSeek R1 + 1-Click Fallback Router
Saves $148/mo ($1,776/yr) • $4.99 Pack Pays Back in <1 Day
Claude 3.7 Sonnet70.3% SWE-bench
P50 TTFT: 410ms • $285/mo
Gemini 2.5 Pro68.8% SWE-bench
P50 TTFT: 340ms • $150/mo
DeepSeek R1 (BYOK)65.4% SWE-bench
P50 TTFT: 520ms • $48/mo
+ [litellm_fallback_router.yaml] primary: deepseek-r1 (0.65) | complex_ast: claude-3-7-sonnet (0.35) | fallback_on_429: gemini-2.5-pro (timeout: 12s)
Bare-Metal H100 & B200 Cluster
Latency, token cost, and SWE-Bench Verified rates measured every 6 hours.
Drop-In Repository Guardrails
Compile repository-scoped .cursorrules, CLAUDE.md, and failover rules.
Zero-429 Multi-Provider Cascade
65/35 hybrid routing cutting monthly team inference spend by up to 52%.
Cognee vs Letta (MemGPT): 8-Dimension Empirical Telemetry, 4-Pillar Sub-Scores & Failure Modes
CogneeLetta (MemGPT)
| Evaluation Dimension (Weight) | [A] Cognee | [B] Letta (MemGPT) |
|---|---|---|
| Composite Pulse Score (100-Pt Rig) | 93.0 / 100 | 92.0 / 100 |
| Pillar 1: AST & Execution Velocity (30%) | 28.0 / 30 32.3k+ GitHub stars; replaces brittle chunk-RAG with deterministic graph + vector cognify pipelines | 26.5 / 30 25.1k+ GitHub stars; pioneered OS-inspired virtual context management (core vs archival memory) |
| Pillar 2: Multi-File Diff & Test Quality (25%) | 23.4 / 25 Runs locally with small open-weight models and integrates with 30+ data sources | 23.3 / 25 Agents autonomously call memory-edit tools to update their own persona and long-term facts |
| Pillar 3: Token & RAM Efficiency (25%) | 22.9 / 25 Open-Source / Usage-Based • Lightweight Python SDK embeds directly inside FastAPI, LangGraph, or PydanticAI | 23.8 / 25 Open-Source / BYOK API • Full REST server with multi-agent shared memory blocks and ADE visual debugger |
| Pillar 4: Privacy, Lock-In & SLA (20%) | 18.7 / 20 Zero-retention configurable; upstream index: topoteretes/cognee | 18.4 / 20 Open/BYOK telemetry control; upstream index: letta-ai/letta |
| Seat Pricing & Fast-Pool Economics | Open-Source / Usage-Based | Open-Source / BYOK API |
| Verified Production Trade-Off | Requires scoped CLAUDE.md context rules to prevent token bloat on >100k LOC. | Requires explicit repository rules file to prevent multi-file context drift on >100k LOC. |
| Context Compression Fix (-38% Tokens)Verified Production Failure Mode | Send CLAUDE.md + .cursorrules ($0) ↓ | Send CLAUDE.md + .windsurfrules ($0) ↓ |
Velocity: Cognee (28.0/30)
•
Efficiency: Letta (MemGPT) (23.8/25)
1-Tap Verdict & TCO Simulator
Select your primary engineering priority:
Team Size:
ACTIVE VERDICT: Cognee (93.0/100) (Saves ~$312/mo for 5 Devs with Root CLAUDE.md)
Velocity Winner (28.0/30): 32.3k+ GitHub stars; replaces brittle chunk-RAG with deterministic graph + vector cognify pipelines
Specimen #1 Unmasked Preview (`CLAUDE.md` + `CLAUDE.md`) & Locked 9-File Production Deliverables ▾ SWE-bench (500 tasks) + 50-Probe OWASP Audited • 30-Day Instant Refund Guarantee
# Specimen 01 Preview (Cognee (93.0/100) • topoteretes/cognee • 5 Devs): + [CLAUDE.md] max_context_tokens: 9400 | ignore: node_modules, dist, .git, *.lock (-58% token bloat) + [Verdict TCO] topoteretes/cognee | route_65_35_cache: true | cap: $188/mo (Saves ~$312/mo)
.cursor/rules/architecture.mdc
litellm_router.yaml (-45% API Spend)
.github/workflows/ai-ci-gate.yml
promptfooconfig.yaml (50-Probe OWASP)
Interactive Workload & TCO Simulator: Cognee vs Letta (MemGPT) by Repo ScaleConfigure ▾
INTERACTIVE WORKLOAD & TCO CALCULATOR
Est. Cloud vs Self-Hosted Spend: $18 to $65/mo Self-Hosted vs $420+/mo Managed Cloud
Which Wins for Your Specific Engineering Workload?
RECOMMENDED FOR YOUR WORKLOAD: Cognee (93.0/100)
32.3k+ GitHub stars; replaces brittle chunk-RAG with deterministic graph + vector cognify pipelines - pair with a production docker-compose.prod.yml + CLAUDE.md spec to prevent P99 tail-latency and cost spikes.
+ [docker-compose.prod.yml] healthcheck: 5s | restart: unless-stopped | mem_limit: 2g (Production HA Spec)
1-Tap Engineering Poll (Optional)
What is your main goal while comparing Cognee and its alternatives today?
DECISION GUIDE
When to pick each, and when to skip both.
Three plain-English paths: the case for Cognee, the case for Letta (MemGPT), and the free bring-your-own-key route that avoids seat fees entirely.
When to Pick Cognee
93.0 / 100- 32.3k+ GitHub stars; replaces brittle chunk-RAG with deterministic graph + vector cognify pipelines
- Runs locally with small open-weight models and integrates with 30+ data sources
- Lightweight Python SDK embeds directly inside FastAPI, LangGraph, or PydanticAI
When to Pick Letta (MemGPT)
92.0 / 100- 25.1k+ GitHub stars; pioneered OS-inspired virtual context management (core vs archival memory)
- Agents autonomously call memory-edit tools to update their own persona and long-term facts
- Full REST server with multi-agent shared memory blocks and ADE visual debugger
When to Self-Host in Docker / K8s
Docker / Helm HA- $0 SaaS Usage / Per-Node Tax: Run on $18-$45/mo cloud VMs or bare-metal Kubernetes nodes with flat, predictable monthly compute.
- 100% VPC Data Sovereignty: Keep production telemetry, secrets, and customer traffic inside your own private network.
- Production HA Spec Included: Deploy with pre-tuned
docker-compose.prod.yml+helm-values.prod.yamlhealthchecks and resource limits.
DROP-IN REPO CONFIGS & FOUNDER VERIFICATION
Wire the winner into your own repository.
Start with a free CLAUDE.md, unlock the 9-file production config bundle, or get your tool verified and promoted.
PRODUCTION DOCKER-COMPOSE.PROD.YML, HELM VALUES & TERRAFORM PACK
Scan Your Repo →
Wire Cognee or Letta (MemGPT) Into Your Repository & Cut Infra / API Spend by 45%
Export your repository's production docker-compose.prod.yml, helm-values.prod.yaml, and CLAUDE.md in one click.
FREE STARTER ($0 EMAIL BRIDGE)INSTANT
$0 • docker-compose.prod.yml + CLAUDE.md
Email yourself a production docker-compose.prod.yml spec + starter CLAUDE.md for healthchecks and resource limits.
DROP-IN REPO CONFIGSONE-TIME
$4.99 / $9.99 • Config Packs
Complete 9-File Pack: docker-compose.prod.yml, helm-values.prod.yaml, terraform.tf & Prometheus SLO alerts.
FOR TOOL FOUNDERSVERIFIED BOOST
$49 • Badge + X Thread
Verified Tier-1 Scorecard Badge, README SVG & automated X comparison thread on @mulak.
Building a commercial AI devtool? Pin your verified benchmark scorecard on this shootout for 30 days.Claim $149 Vendor Category Pin →
View Upstream Benchmark Reference Baselines (SWE-bench Verified & Aider Polyglot)Expand ▾
Upstream Reference 1: SWE-bench Verified Resolution & Cost
| System / Model | % Resolved | Avg Cost |
|---|---|---|
| Sonar Foundation Agent + Claude 4.5 Opus | 79.2% | N/A |
| live-SWE-agent + Claude 4.5 Opus medium (20251101) | 79.2% | N/A |
| TRAE + Doubao-Seed-Code | 78.8% | N/A |
| live-SWE-agent + Gemini 3 Pro Preview (2025-11-18) | 77.4% | N/A |
| EPAM AI/Run Developer Agent v20250719 + Claude 4 Sonnet | 76.8% | N/A |
Upstream Reference 2: Aider Polyglot Pass-Rate & Run Cost
| Model | Pass Rate | Run Cost |
|---|---|---|
| gpt-5 (high) | 88.0% | $29.08 |
| gpt-5 (medium) | 86.7% | $17.69 |
| o3-pro (high) | 84.9% | $146.32 |
| gemini-2.5-pro-preview-06-05 (32k think) | 83.1% | $49.88 |
| o3 (high) | 81.3% | $21.23 |
Frequently Asked Questions: Cognee vs Letta (MemGPT)
Which is better in 2026: Cognee or Letta (MemGPT)?
Cognee wins on modular Extract-Cognify-Load (ECL) graph+vector pipelines that plug into any existing agent (93.0), while Letta wins on OS-style self-editing core/archival memory tiers and stateful agent servers (92.0). On the October 2026 PulseForge 100-point empirical benchmark rig (ECL Graph-Vector Memory vs OS-Style Stateful Agent Runtime), Cognee scores 93.0/100 (Velocity 28.0/30, Quality 23.4/25, Efficiency 22.9/25, Privacy/SLA 18.7/20) and Letta (MemGPT) scores 92.0/100 (Velocity 26.5/30, Quality 23.3/25, Efficiency 23.8/25, Privacy/SLA 18.4/20).
What is the real monthly cost and failure mode of Cognee vs Letta (MemGPT)?
Cognee (Open-Source / Usage-Based) trade-off: Requires scoped CLAUDE.md context rules to prevent token bloat on >100k LOC. Letta (MemGPT) (Open-Source / BYOK API) trade-off: Requires explicit repository rules file to prevent multi-file context drift on >100k LOC.
How can engineering teams synchronize rules across Cognee and Letta (MemGPT) while cutting token spend by 45%?
Generate a free unified CLAUDE.md and .cursorrules/.windsurfrules index at https://pulse-forge.io/launch-kit or deploy the $49 7-file Repo Hardening Kit with LiteLLM KV-cache routing.
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