What is the cheapest AI API for content moderation?

The cheapest AI API for content moderation is Gemini 2.0 Flash Lite at $0.075/$0.30 per 1M tokens. For moderation tasks that need reliable safety classification, Gemini 2.5 Flash-Lite ($0.10/$0.40) or GPT-4o mini ($0.15/$0.60) offer better accuracy. Moderating 10,000 pieces of UGC/day costs $0.50-$5/month depending on the model.

How much does AI content moderation cost per month?

Moderating 10,000 pieces of user content per day (500 input + 100 output tokens each) costs: Gemini Flash Lite ~$0.50/month, GPT-4o mini ~$1.50/month, Claude Haiku ~$5/month. For high-volume platforms (100K+ items/day), budget $5-50/month. Batch processing can reduce costs by 50% for non-real-time moderation.

Can I use OpenAI's free moderation endpoint instead?

Yes — OpenAI offers a free Moderation API endpoint that covers hate, harassment, self-harm, and sexual content. It's the cheapest option (free!) for basic safety classification. However, it only covers OpenAI's content policy categories. For custom moderation rules (spam, off-topic, brand safety, custom policies), you'll need a general-purpose LLM. Many platforms use the free OpenAI moderation as a first pass, then LLMs for nuanced decisions.

Cheapest AI API for Content Moderation

Find the cheapest AI API for content moderation and safety. Compare 42 models for UGC filtering, chat moderation, and policy enforcement.

Calculate Your Moderation Cost

Enter your moderation workload to see the cheapest models for your platform.

Platform type:

Items to moderate per day

Avg input tokens per item

Avg output tokens per item

Days per month

Moderation API Cost Ranking

Every model ranked by cost for a typical moderation workload: 10,000 items/day, 500 input / 100 output tokens per item.

Top Picks by Volume

Small Platform (under $10/month)

Gemini 2.0 Flash Lite$0.50/mo

Gemini 2.5 Flash-Lite$0.66/mo

Mistral Small 4$0.66/mo

Growing Platform ($10-50/month)

DeepSeek V4 Flash$0.92/mo

GPT-4o mini$1.50/mo

GPT-oss 20B$1.05/mo

Enterprise (100K+ items/day)

Claude Haiku 4.5$15.00/mo

Gemini 2.5 Pro$11.25/mo

Claude Sonnet 4$75.00/mo

Strategy: Two-Stage Moderation Pipeline

Most platforms can save 80-95% by using a two-stage moderation pipeline: cheap auto-approve for obvious passes, LLM only for borderline content.

Two-Stage Pipeline (10K items/day)

Stage 1: Keyword + regex filter (free)$0/mo

Stage 2: 20% borderline → Gemini Flash$0.10/mo

Stage 3: 5% complex → Claude Haiku$0.75/mo

Total with pipeline$0.85/mo (vs $15 for all via Haiku)

This two-stage approach saves 94% compared to running everything through Claude Haiku. The key insight: most user content is clearly safe or clearly violating — only 5-20% needs nuanced AI judgment.

Moderation-Specific Considerations

Free tier exists: OpenAI's Moderation API is free and covers hate, harassment, self-harm, and sexual content. Use it as a first pass before spending on LLMs.
Latency matters for real-time: Chat moderation needs sub-200ms responses. Budget models (Flash, DeepSeek) are optimized for speed. Batch processing is 50%+ cheaper but adds latency.
False positives are costly: Over-moderating (removing legitimate content) frustrates users. Test each model's precision/recall on your specific content before deploying.
Custom policies need LLMs: Built-in moderation endpoints only cover standard categories. For brand safety, off-topic filtering, or custom community guidelines, you need a general-purpose LLM.
Batch for non-real-time: If you can tolerate 1-5 minute delays (forum posts, reviews, listings), batch processing via async APIs saves 50%+ on moderation costs.

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