PQS: Prompt Quality Score – Cross-Model Comparison

Choose this endpoint when you need an objective, third-party judgment of prompt quality across multiple leading LLMs simultaneously. It is ideal for prompt engineers, AI developers, and researchers who want to benchmark their prompts against both Claude Sonnet 4 and GPT-4o rather than testing each model manually. Prefer it over single-model evaluation when cross-model comparison or domain-specific scoring (software, research, crypto, etc.) is required.

• Prompt text missing or empty — returns 400 validation error
• Prompt exceeds 10,000 character limit — returns 400
• Invalid vertical enum value — returns 400 schema validation error
• Payment not included or insufficient — returns 402 Payment Required
• Upstream model API timeout — may return 503 or partial result
• Judge model failure — scoring may be incomplete or unavailable