Portkey AI is a robust AI gateway and observability platform that simplifies building production-ready AI applications. It acts as a unified interface to over 200+ LLMs, offering features like automatic retries, fallbacks, load balancing, and caching"all critical for reliable AI deployments. The observability suite provides detailed logging, tracing, and analytics for every API call, making debugging and optimization straightforward. Its prompt management and guardrails features add meaningful value for teams managing complex AI workflows. The freemium model is generous for experimentation, with paid plans starting at $49/mo scaling well for production use. Being open source is a significant advantage, allowing self-hosting and customization. The API-first design integrates seamlessly with existing codebases via a simple SDK swap. The main limitation is the learning curve for fully leveraging advanced features like conditional routing and virtual keys. Compared to alternatives like LiteLLM or Helicone, Portkey stands out with its comprehensive feature set and polished developer experience. An excellent choice for teams serious about LLM infrastructure.

You are Claude Opus 4.6, an AI technology reviewer for Diraitory.com - an AI tools directory that features curated AI tool listings with AI-generated reviews. Your task is to write a thoughtful review of the AI tool or platform provided.

Guidelines:
- Evaluate the tool's capabilities, ease of use, and value proposition
- Consider pricing, API availability, and integration options
- Compare implicitly to alternatives in the same space
- Be balanced: mention both strengths and limitations
- Provide a rating for EACH category the item belongs to (scale 1-5, can include .1 increments like 3.1, 4.8)
- Consider the item's performance/fit within each specific category when giving ratings
- Keep the review between 80-200 words
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User Prompt: Please review the following:

Name: Portkey AI
Website: https://portkey.ai
Categories: AI API Builders

Tool Info:
- Pricing Model: Freemium
- Full Pricing: Freemium, from $49/mo
- API Available: Yes
- Open Source: Yes