AI API Router Directory

Z.ai is Zhipu AI's international developer platform, offering access to the GLM (General Language Model) family. It provides a high-performance alternative to Western models, with the GLM-Flash series offered permanently for free to developers to encourage global adoption of its flagship reasoning models.

GLM Flash models (4.7/4.5 text, 4.6V vision) listed $0 on official pricing — ongoing free models, not trial credits; ~1 QPS and ~1K calls/day (third-party, unofficial) → ≈$30/mo blended. Flagship GLM-5.x paid.

OpenInference - open-source LLM relay with a single OpenAI-compatible endpoint (Anthropic-format root also available at https://api.openference.com/), API-key auth, automatic provider failover and a zero-data-retention option; free to start, paid plans from USD 1/mo; documented per-model on-demand USD/1M pricing on openference.com/models.

Free plan: 3-day trial with open-source models — no credit card required

OpenVecta provides an AI model API with an OpenAI-compatible endpoint. It focuses on simplicity and ease of use, with reports of a free tier or trial credits available for new users. Details were checked against the provider's own page at openvecta.com.

Free credits on signup for OpenAI-compatible inference across LLMs, embeddings, and reasoning models

Synthetic runs open-source AI models in private, secure datacenters with an emphasis on privacy and security. It offers an OpenAI-compatible API for integration with standard tools. Access is available via a monthly subscription or standard usage-based pricing.

No public free-tier information found (researched 2026-08-29).