Azure AI Content Safety / Prompt Shields vs AWS Bedrock Guardrails: Cost and Coverage
Side-by-side comparison across price, pricing model, OWASP LLM Top 10 coverage, deployment and headquarters. Verified 2026-09-23.
Headline verdict
Per unit, AWS Bedrock Guardrails is cheaper for the prompt-attack filter alone. Azure Prompt Shields bundles more filter types into the headline rate (groundedness, task adherence, protected material), so the apples-to-apples gap narrows once you add comparable AWS filter line items. Buyers already on Azure should default to Prompt Shields; AWS-native shops to Bedrock Guardrails. Cross-cloud premium is rarely worth it for guardrails.
Side by side
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OWASP LLM Top 10 coverage, side by side
Coloured cells, not Unicode checkmarks. Partial coverage marked with a half-circle.
| OWASP entry | Azure Prompt Shields | Bedrock Guardrails |
|---|---|---|
| LLM01 Prompt injection | ✓ | ✓ |
| LLM02 Sensitive info disclosure | ✓ | ✓ |
| LLM03 Supply chain | ✗ | ✗ |
| LLM04 Data and model poisoning | ✗ | ✗ |
| LLM05 Improper output handling | ✓ | ✓ |
| LLM06 Excessive agency | ✓ | ✗ |
| LLM07 System prompt leakage | ✗ | ✗ |
| LLM08 Vector and embedding | ✗ | ✗ |
| LLM09 Misinformation | ✓ | ✓ |
| LLM10 Unbounded consumption | ✗ | ✗ |
Scenario verdicts
Five common buyer profiles and the better fit in each.
Regulated enterprise on Azure
Same audit boundary as the rest of the Azure tenancy.
AWS-native startup
Same audit boundary as the rest of the AWS account.
Volume-sensitive workload
$0.08 per 1K text units beats $0.38 per 1K text records for prompt-attack alone.
Multi-filter, full-content-safety need
Azure bundles more filter types under the headline rate.
Cross-cloud team
Pick the cloud you are already audited on; do not run guardrails cross-cloud.
If you are on one and considering the other
The expensive part of switching is not the per-call price, it is the policy code and the eval suite you have built around one vendor. Migrating policies between Azure and AWS typically costs more in engineering time than a year of either bill.