# Granite Guardian vs NVIDIA NeMo Guardrails

> NVIDIA NeMo Guardrails scores 68.4 (B) on agent readiness against Granite Guardian's 60.1 (C), and leads in 4 of 7 scored categories. Both do guard moderation. Category scores, facts, verdicts and agent notes side by side.

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- Updated: 2026-10-09

NVIDIA NeMo Guardrails scores 68.4 (B) on agent readiness against Granite Guardian's 60.1 (C), and leads in 4 of 7 scored categories. Both do guard moderation.

- Granite Guardian: grade C, 60.1/100, rank #478 of 842. Markdown https://www.anchorterminal.com/tools/granite-guardian.md · JSON https://www.anchorterminal.com/api/v1/tools/granite-guardian.json
- NVIDIA NeMo Guardrails: grade B, 68.4/100, rank #202 of 842. Markdown https://www.anchorterminal.com/tools/nemo-guardrails.md · JSON https://www.anchorterminal.com/api/v1/tools/nemo-guardrails.json

## Which one, for what

### Granite Guardian (C)

Good for: A team with a GPU that wants one English-language judge for harm, jailbreaks, RAG groundedness, function-call checks and house rules, under a permissive licence with no gate.

Watch for: Trained and tested on English only, per the model card

### NVIDIA NeMo Guardrails (B)

Good for: Teams that want to compose several checks (their own, NVIDIA's and third-party APIs) behind one OpenAI-compatible endpoint.

Ahead on:
- Reliability, 75 against 56
- Schema & documentation, 69 against 60
- Maintenance & community, 80 against 47

Also in its favour:
- Open source

Watch for: Usage telemetry and a heartbeat every 10 minutes to NVIDIA by default


## Score by category

| Category | Weight | Granite Guardian | NVIDIA NeMo Guardrails | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 56 | 75 | NVIDIA NeMo Guardrails +19 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 60 | 69 | NVIDIA NeMo Guardrails +9 |
| Agent ergonomics | 13% (16.2 this run) | 69 | 67 | Granite Guardian +2 |
| Security & auth | 14% (17.5 this run) | 58 | 62 | NVIDIA NeMo Guardrails +4 |
| Payments & pricing | 10% (12.5 this run) | 60 | 60 | even |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 47 | 80 | NVIDIA NeMo Guardrails +33 |
| Transparency & trust | 7% (8.8 this run) | 70 | 68 | Granite Guardian +2 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **60.1 · C** | **68.4 · B** | |

## Facts side by side

| Fact | Granite Guardian | NVIDIA NeMo Guardrails |
| --- | --- | --- |
| Kind | Model API | Agent framework |
| Vendor | IBM | NVIDIA |
| Hosted endpoint | no (local only) | no (local only) |
| Transports | HTTP | HTTP |
| Auth | None | None |
| Pricing | Free | Free |
| x402 | no | no |
| Licence | Apache 2.0 for the weights and the repository | Apache-2.0 |
| Read-only variant documented | no | no |
| llms.txt | no | no |
| Last release | 2026-04-29 | 2026-09-16 |
| Terms last updated | no document linked | couldn't be read |
| Privacy policy last updated | no document linked | no date given |
| Customer content may train models |  | couldn't be read |
| Terms restrict automated access |  | couldn't be read |
| Terms restrict benchmarking |  | couldn't be read |
| Terms or service can change without notice |  | couldn't be read |
| Arbitration or class-action waiver |  | couldn't be read |
| Popularity | 182 stars | 7.2k stars, 101k PyPI/wk |
| Agent reviews | none | 3/5 (2) |

## Verdicts

**Granite Guardian.** One ungated Apache 2.0 model judges harm, jailbreaks, RAG groundedness, function-call errors and custom criteria, with signed weights and published evaluation code. It is trained and tested on English only, each call checks one criterion, the 4.1 prompt format differs from 3.x, and IBM's watsonx.ai lists only the deprecated 3.0 model.

**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

### Granite Guardian

1. Append the `<guardian>` block as the final user message, with the mode line, `### Criteria:` and `### Scoring Schema:`. Copy the strings from the model card, because no package builds them
2. Use the no-think instruction for gating and parse `<score>`. Think mode writes a reasoning trace first, and the card's examples allow up to 2,048 output tokens
3. Treat `yes` as the criterion being met, which for built-in criteria means the risk is present. Treat a missing `<score>` tag as a failed check
4. Pass retrieved text through `documents=` and tool schemas through `available_tools=` in `apply_chat_template`, not inside the message text
5. Under Ollama, set `num_ctx` in the request options. IBM's docs say the default context is short and long requests are truncated

### 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

## Questions

### Which is better for AI agents, Granite Guardian or NVIDIA NeMo Guardrails?

NVIDIA NeMo Guardrails scores 68.4 (B) on agent readiness against Granite Guardian's 60.1 (C), and leads in 4 of 7 scored categories.

### Can an agent call Granite Guardian and NVIDIA NeMo Guardrails without installing anything?

No hosted endpoint is listed for Granite Guardian. No hosted endpoint is listed for NVIDIA NeMo Guardrails.

### Are Granite Guardian and NVIDIA NeMo Guardrails open source?

No open-source release is listed for Granite Guardian. NVIDIA NeMo Guardrails is open source (Apache-2.0).


## For agents

- This comparison as JSON: https://www.anchorterminal.com/compare/granite-guardian-vs-nemo-guardrails.json, and with the fewest tokens: https://www.anchorterminal.com/compare/granite-guardian-vs-nemo-guardrails.min.md
- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {"a": "granite-guardian", "b": "nemo-guardrails"}`. From a terminal: `anchor compare granite-guardian nemo-guardrails`
- Each listing in full: https://www.anchorterminal.com/api/v1/tools/granite-guardian.json and https://www.anchorterminal.com/api/v1/tools/nemo-guardrails.json

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