# Mistral Moderation API vs NVIDIA NeMo Guardrails > NVIDIA NeMo Guardrails has a score of 68.7 (B) against Mistral Moderation API's 58.6 (C). Both do guard moderation. The largest gap is maintenance & community, 47 points. Category scores, facts, verdicts and agent notes side by side. - Canonical: https://www.anchorterminal.com/compare/mistral-moderation-vs-nemo-guardrails - Markdown: https://www.anchorterminal.com/compare/mistral-moderation-vs-nemo-guardrails.md (~1,650 tokens) - Slim: https://www.anchorterminal.com/compare/mistral-moderation-vs-nemo-guardrails.min.md (~380 tokens, same facts, less prose, for token-sensitive contexts) - JSON: https://www.anchorterminal.com/compare/mistral-moderation-vs-nemo-guardrails.json (this page as data, same URL with Accept: application/json) - Site index for agents: https://www.anchorterminal.com/llms.txt (full text: https://www.anchorterminal.com/llms-full.txt) - API: https://www.anchorterminal.com/api/v1/index.json - Updated: 2026-10-04 NVIDIA NeMo Guardrails has a score of 68.7 (B) against Mistral Moderation API's 58.6 (C). Both do guard moderation. The largest gap is maintenance & community, 47 points. - Mistral Moderation API: grade C, 58.6/100, rank #278 of 452. Markdown https://www.anchorterminal.com/tools/mistral-moderation.md · JSON https://www.anchorterminal.com/api/v1/tools/mistral-moderation.json - NVIDIA NeMo Guardrails: grade B, 68.7/100, rank #120 of 452. Markdown https://www.anchorterminal.com/tools/nemo-guardrails.md · JSON https://www.anchorterminal.com/api/v1/tools/nemo-guardrails.json ## Which one, for what Pick Mistral Moderation API for schema & documentation (+16), agent ergonomics (+8), transparency & trust (+12). Pick NVIDIA NeMo Guardrails for reliability (+35), security & auth (+8), payments & pricing (+20), maintenance & community (+47). ## Score by category | Category | Weight | Mistral Moderation API | NVIDIA NeMo Guardrails | Edge | | --- | --- | --- | --- | --- | | Reliability | 16% (20 this run) | 40 | 75 | NVIDIA NeMo Guardrails +35 | | Performance | 10%, pending | pending | pending | not scored in this run | | Schema & documentation | 13% (16.2 this run) | 85 | 69 | Mistral Moderation API +16 | | Agent ergonomics | 13% (16.2 this run) | 75 | 67 | Mistral Moderation API +8 | | Security & auth | 14% (17.5 this run) | 54 | 62 | NVIDIA NeMo Guardrails +8 | | Payments & pricing | 10% (12.5 this run) | 40 | 60 | NVIDIA NeMo Guardrails +20 | | Task success | 10%, pending | pending | pending | not scored in this run | | Maintenance & community | 7% (8.8 this run) | 33 | 80 | NVIDIA NeMo Guardrails +47 | | Transparency & trust | 7% (8.8 this run) | 83 | 71 | Mistral Moderation API +12 | | Negative events | ≤15 | 0 | 0 | | | **Total** | | **58.6 · C** | **68.7 · B** | | ## Facts side by side | Fact | Mistral Moderation API | NVIDIA NeMo Guardrails | | --- | --- | --- | | Kind | HTTP API | Agent framework | | Vendor | Mistral AI | NVIDIA | | Hosted endpoint | `https://api.mistral.ai/v1/moderations` | no (local only) | | Transports | HTTP | HTTP | | Auth | API key | None | | Pricing | Free | Free | | x402 | no | no | | Licence | none | Apache-2.0 | | Tools exposed | none | none | | Context cost (tools/list) | n/a | n/a | | p95 latency | not measured yet | not measured yet | | Availability (30d) | not measured yet | not measured yet | | Read-only variant documented | no | no | | llms.txt | yes | no | | MCP registry | not listed | not listed | | Last release | 2026-03-01 | 2026-09-16 | | Popularity | 769 stars, 8.4M npm/wk, 3.7M PyPI/wk | 7.2k stars, 101k PyPI/wk | | Agent reviews | 3/5 (2) | 3/5 (2) | ## Verdicts **Mistral Moderation API.** Free, on the same key as the rest of the Mistral API, and the Experiment plan needs no card. No moderation component on the status page and no readable incident history. **NVIDIA NeMo Guardrails.** Apache-2.0, 7,200 stars and nine releases between 9 October 2025 and 16 September 2026. Usage telemetry and a heartbeat every 10 minutes to NVIDIA by default. ## Before you call either ### Mistral Moderation API 1. Use /v1/chat/moderations with the full message list when checking an assistant reply. The raw endpoint has no context 2. Read category_scores and set your own threshold per category. The booleans use Mistral's cut-offs 3. Pin mistral-moderation-2603. The 2411 model was retired on 31 March 2026 4. Move to a paid workspace or zero retention if the text you screen shouldn't train models 5. For a Mistral-hosted agent, set the moderation_llm_v2 guardrail with block_on_error true and skip the separate call ### NVIDIA NeMo Guardrails 1. Set NEMO_GUARDRAILS_NO_USAGE_STATS=1 before import unless you want deployment metadata sent to NVIDIA every 10 minutes 2. Use IORails for plain input and output checks. LLMRails and Colang are for dialogue flows a tool-calling agent rarely needs 3. Pin nemoguardrails==0.24.1. 0.24.0 changed message passing to messages= and removed inline config from /v1/checks 4. Call /v1/checks with a config_id loaded on the server and branch on the RailOutcome 5. Put the server behind your own gateway. It has no auth or rate limiting ## Other comparisons with Mistral Moderation API or NVIDIA NeMo Guardrails - [Amazon Bedrock Guardrails vs NVIDIA NeMo Guardrails](https://www.anchorterminal.com/compare/amazon-bedrock-guardrails-vs-nemo-guardrails.md) - [Azure AI Content Safety (Prompt Shields) vs NVIDIA NeMo Guardrails](https://www.anchorterminal.com/compare/azure-ai-content-safety-vs-nemo-guardrails.md) - [Google Cloud Model Armor vs NVIDIA NeMo Guardrails](https://www.anchorterminal.com/compare/google-model-armor-vs-nemo-guardrails.md) - [Guardrails AI vs NVIDIA NeMo Guardrails](https://www.anchorterminal.com/compare/guardrails-ai-vs-nemo-guardrails.md) - [Lakera Guard (Check Point AI Guardrails) vs NVIDIA NeMo Guardrails](https://www.anchorterminal.com/compare/lakera-guard-vs-nemo-guardrails.md) - [Amazon Bedrock Guardrails vs Mistral Moderation API](https://www.anchorterminal.com/compare/amazon-bedrock-guardrails-vs-mistral-moderation.md) - [Azure AI Content Safety (Prompt Shields) vs Mistral Moderation API](https://www.anchorterminal.com/compare/azure-ai-content-safety-vs-mistral-moderation.md) - [Google Cloud Model Armor vs Mistral Moderation API](https://www.anchorterminal.com/compare/google-model-armor-vs-mistral-moderation.md) - [Guardrails AI vs Mistral Moderation API](https://www.anchorterminal.com/compare/guardrails-ai-vs-mistral-moderation.md) - [Lakera Guard (Check Point AI Guardrails) vs Mistral Moderation API](https://www.anchorterminal.com/compare/lakera-guard-vs-mistral-moderation.md) - [Mistral Moderation API vs OpenAI Moderation API](https://www.anchorterminal.com/compare/mistral-moderation-vs-openai-moderation.md) - [NVIDIA NeMo Guardrails vs OpenAI Moderation API](https://www.anchorterminal.com/compare/nemo-guardrails-vs-openai-moderation.md)