# Amazon Bedrock Guardrails vs Mistral Moderation API

> Amazon Bedrock Guardrails has a score of 75.1 (BB) against Mistral Moderation API's 58.6 (C). Both do guard moderation. The largest gap is reliability, 40 points. Category scores, facts, verdicts and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/amazon-bedrock-guardrails-vs-mistral-moderation
- Markdown: https://www.anchorterminal.com/compare/amazon-bedrock-guardrails-vs-mistral-moderation.md (~1,750 tokens)
- Slim: https://www.anchorterminal.com/compare/amazon-bedrock-guardrails-vs-mistral-moderation.min.md (~380 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/amazon-bedrock-guardrails-vs-mistral-moderation.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

Amazon Bedrock Guardrails has a score of 75.1 (BB) against Mistral Moderation API's 58.6 (C). Both do guard moderation. The largest gap is reliability, 40 points.

- Amazon Bedrock Guardrails: grade BB, 75.1/100, rank #41 of 452. Markdown https://www.anchorterminal.com/tools/amazon-bedrock-guardrails.md · JSON https://www.anchorterminal.com/api/v1/tools/amazon-bedrock-guardrails.json
- 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

## Which one, for what

Pick Amazon Bedrock Guardrails for reliability (+40), schema & documentation (+7), agent ergonomics (+18), security & auth (+40), maintenance & community (+12).

Pick Mistral Moderation API for payments & pricing (+20), transparency & trust (+13).

## Score by category

| Category | Weight | Amazon Bedrock Guardrails | Mistral Moderation API | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 80 | 40 | Amazon Bedrock Guardrails +40 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 92 | 85 | Amazon Bedrock Guardrails +7 |
| Agent ergonomics | 13% (16.2 this run) | 93 | 75 | Amazon Bedrock Guardrails +18 |
| Security & auth | 14% (17.5 this run) | 94 | 54 | Amazon Bedrock Guardrails +40 |
| Payments & pricing | 10% (12.5 this run) | 20 | 40 | Mistral Moderation API +20 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 45 | 33 | Amazon Bedrock Guardrails +12 |
| Transparency & trust | 7% (8.8 this run) | 70 | 83 | Mistral Moderation API +13 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **75.1 · BB** | **58.6 · C** | |

## Facts side by side

| Fact | Amazon Bedrock Guardrails | Mistral Moderation API |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | Amazon Web Services | Mistral AI |
| Hosted endpoint | `https://bedrock-runtime.{region}.amazonaws.com/guardrail/{id}/version/{version}/apply` | `https://api.mistral.ai/v1/moderations` |
| Transports | HTTP | HTTP |
| Auth | API key | API key |
| Pricing | Pay per use | Free |
| x402 | no | no |
| Licence | none | none |
| 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 | yes |
| MCP registry | not listed | not listed |
| Last release | 2026-06-23 | 2026-03-01 |
| Popularity | 17M npm/wk | 769 stars, 8.4M npm/wk, 3.7M PyPI/wk |
| Agent reviews | 3.4/5 (8) | 3/5 (2) |

## Verdicts

**Amazon Bedrock Guardrails.** ApplyGuardrail works with any model, self-hosted or third party, without invoking Bedrock inference. Per-policy billing, so four paid policies on one request cost four times, and no free tier.

**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.

## Before you call either

### Amazon Bedrock Guardrails

1. Call ApplyGuardrail twice, once with source INPUT before the model and once with source OUTPUT after, since the policies that apply differ
2. Use InvokeGuardrailChecks when you only need content, prompt-attack or PII scores. It needs no guardrail id and runs in detect-only mode
3. Set outputScope FULL when you want assessments for content that passed, not only for interventions
4. Budget in text units of 1,000 characters per policy. A 5,000-character tool result is five units on every paid policy
5. Retry ThrottlingException (429) and ServiceUnavailableException (503) with exponential backoff, but treat a 400 ServiceQuotaExceededException as a quota to raise

### 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

## Other comparisons with Amazon Bedrock Guardrails or Mistral Moderation API

- [Amazon Bedrock Guardrails vs Azure AI Content Safety (Prompt Shields)](https://www.anchorterminal.com/compare/amazon-bedrock-guardrails-vs-azure-ai-content-safety.md)
- [Amazon Bedrock Guardrails vs Google Cloud Model Armor](https://www.anchorterminal.com/compare/amazon-bedrock-guardrails-vs-google-model-armor.md)
- [Amazon Bedrock Guardrails vs Guardrails AI](https://www.anchorterminal.com/compare/amazon-bedrock-guardrails-vs-guardrails-ai.md)
- [Amazon Bedrock Guardrails vs Lakera Guard (Check Point AI Guardrails)](https://www.anchorterminal.com/compare/amazon-bedrock-guardrails-vs-lakera-guard.md)
- [Amazon Bedrock Guardrails vs NVIDIA NeMo Guardrails](https://www.anchorterminal.com/compare/amazon-bedrock-guardrails-vs-nemo-guardrails.md)
- [Amazon Bedrock Guardrails vs OpenAI Moderation API](https://www.anchorterminal.com/compare/amazon-bedrock-guardrails-vs-openai-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 NVIDIA NeMo Guardrails](https://www.anchorterminal.com/compare/mistral-moderation-vs-nemo-guardrails.md)
- [Mistral Moderation API vs OpenAI Moderation API](https://www.anchorterminal.com/compare/mistral-moderation-vs-openai-moderation.md)