Monitoring

Helicone

AI gateway and observability proxy for 300+ models across all major providers. One-line integration with session tracking, cost reporting, and prompt management.

freemium · $0-$79/mo

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Features

  • AI Gateway with unified API for 300+ models
  • Session-level metrics for multi-step agent debugging
  • Prompt management with versioning and dynamic variables
  • One-line proxy integration (change base URL only)
  • HQL query language for LLM usage analysis

Best use cases

Compatible tools

Anthropic

Claude Opus 4.6, Sonnet 4.5, and Haiku 4.5 with extended thinking, agent teams, MCP integration, and up to 1M token context windows.

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Mistral

Cost-efficient models including Devstral 2 for agentic coding, Magistral for reasoning, and Mistral OCR 3 for document processing at low per-token pricing.

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OpenAI

GPT-5.2 and o-series reasoning models with the Responses API, AgentKit, and built-in tools for web search, code execution, and computer use.

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Vercel

Frontend and serverless hosting with AI SDK 6 (Agent abstraction, MCP support), AI Gateway across major LLM providers, and edge functions.

usage-based

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