What are the best open source frameworks right now for preventing jailbreaks and prompt injection in custom LLM applications built for small businesses
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Fan-out diagram
The searches the AI actually ran for this prompt.
SEED QUERY
What are the best open source frameworks right now for preventing jailbreaks and prompt injection in custom LLM applications built for small businesses
1 real search · 1 real-search pass
best open source LLM prompt injection jailbreak defense frameworks 2026 NeMo Guardrails LLM Guard Guardrails AI Vigil PromptfooGoogle ↗
OBSERVEDComparison
Badge and edge weight = share of passes that produced the query. Hover a query for its intent and routing format.
Query classes
Google's semantic query class for every sub-query: what kind of answer each search is after, simulated vs real.
ChatGPT real searches (1)
Classes come from the query-classifier (a local Laya model). 1 of 1 calls are low-confidence (under 50%) — hover a query in the table to see its confidence.
Searches and sources
ChatGPT1 real searches · gpt-6
best open source LLM prompt injection jailbreak defense frameworks 2026 NeMo Guardrails LLM Guard Guardrails AI Vigil Promptfoo Google ↗
- PurpleLlama/LlamaFirewall/README.md at main · meta-llama/PurpleLlama · github.com
- AlignmentCheck · meta-llama.github.io
- LlamaFirewall: An open source guardrail system for building secure AI agents · ai.meta.com
- Overview · docs.nvidia.com
- NVIDIA NeMo Guardrails Library · docs.nvidia.com
- LLM Guard GitHub · github.com
- 10 Best LLM Security Tools in 2026 (Open Source to Enterprise) · trent.ai
- GitHub - ant-research/awesome-mllm-guardrails: A curated list of LLM/MLLM guardrails, safety benchmarks, guard models, jailbreak attacks, moderation datasets, and evaluation tools. · github.com
- AISVS/1.01/research/chapters/C02-User-Input-Validation/C02-01-Prompt-Injection-Defense.md at main · OWASP/AISVS · github.com
- Guardrails AI GitHub · github.com
- Guardrails AI framework for LLM input and output validation · societyforaisecurity.com
- Llama Prompt Guard 2 · dev.meta.ai
- PurpleLlama/Llama-Prompt-Guard-2/README.md at main · meta-llama/PurpleLlama · github.com
- Promptfoo GitHub · github.com