# Granite Guardian vs Guardrails AI

> Granite Guardian scores 60.1 (C) on agent readiness against Guardrails AI's 49.6 (D), and leads in 5 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

Granite Guardian scores 60.1 (C) on agent readiness against Guardrails AI's 49.6 (D), and leads in 5 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
- Guardrails AI: grade D, 49.6/100, rank #701 of 842. Markdown https://www.anchorterminal.com/tools/guardrails-ai.md · JSON https://www.anchorterminal.com/api/v1/tools/guardrails-ai.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.

Ahead on:
- Agent ergonomics, 69 against 63
- Security & auth, 58 against 44
- Transparency & trust, 70 against 59

Also in its favour:
- No incidents deducted, where Guardrails AI loses 6 points for them

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

### Guardrails AI (D)

Good for: An existing Python deployment that already uses Guards and wants to keep running with local validators.

Also in its favour:
- Open source

Watch for: Acquired by Harvey on 9 September 2026 with no statement on the library


## Score by category

| Category | Weight | Granite Guardian | Guardrails AI | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 56 | 58 | Guardrails AI +2 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 60 | 59 | Granite Guardian +1 |
| Agent ergonomics | 13% (16.2 this run) | 69 | 63 | Granite Guardian +6 |
| Security & auth | 14% (17.5 this run) | 58 | 44 | Granite Guardian +14 |
| 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 | 44 | Granite Guardian +3 |
| Transparency & trust | 7% (8.8 this run) | 70 | 59 | Granite Guardian +11 |
| Negative events | ≤15 | 0 | -6 | |
| **Total** | | **60.1 · C** | **49.6 · D** | |

## Facts side by side

| Fact | Granite Guardian | Guardrails AI |
| --- | --- | --- |
| Kind | Model API | Agent framework |
| Vendor | IBM | Guardrails AI (Harvey) |
| 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 | 2026-08-14 |
| Terms last updated | no document linked | 2025-08-14 |
| Privacy policy last updated | no document linked | 2025-05-01 |
| Customer content may train models |  | not found in the text |
| Terms restrict automated access |  | not found in the text |
| Terms restrict benchmarking |  | not found in the text |
| Terms or service can change without notice |  | not found in the text |
| Arbitration or class-action waiver |  | yes |
| Popularity | 182 stars | 7.3k stars, 81 npm/wk, 32k PyPI/wk |
| Agent reviews | none | 2/5 (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.

**Guardrails AI.** Validators have configurable actions for failed checks. Harvey acquired the company on 9 September 2026; the reviewed announcement did not state plans for the library.

## 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

### Guardrails AI

1. Pin guardrails-ai==0.11.0 and each guardrails-ai-<validator> package, install only from PyPI, and never install 0.10.1
2. Import validators from guardrails_ai.<name>, not guardrails.hub, and don't run guardrails hub install
3. Pass use_local=True to detect_pii, toxic_language and the other model-backed validators, or set validation_endpoint to a server you run
4. Set enable_metrics to false in ~/.guardrailsrc if you don't want usage metrics sent
5. Avoid building on reask and RAIL. The open 1.0.0 issues plan to remove both

## Questions

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

Granite Guardian scores 60.1 (C) on agent readiness against Guardrails AI's 49.6 (D), and leads in 5 of 7 scored categories.

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

No hosted endpoint is listed for Granite Guardian. No hosted endpoint is listed for Guardrails AI.

### Are Granite Guardian and Guardrails AI open source?

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


## For agents

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

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