AI API Router Directory

Vertex AI serves Google's Gemini models through Google Cloud's paid API (aiplatform.googleapis.com), with project-level billing and a choice between global and non-global endpoints; the generative-AI pricing URL now renders as the Agent Platform (Gemini Enterprise Agent Platform) pricing page. Published list prices per 1M tokens: Gemini 3.8 / 3.7 / 3.6 Flash are on introductory pricing of $0.75 input and $3.75 output through December 31, 2026, rising to $1.50 and $7.50 on January 1, 2027, while Gemini 3.5 Flash-Lite is $0.30 input and $2.50 output and Gemini 2.5 Flash is $0.30 and $2.50. The Vertex pricing page states no standing free monthly token allowance for Gemini; Google's free-tier documentation instead gives $300 in 90-day Free Trial credit and a separate free tier for many Gemini models under the Gemini Developer API (AI Studio).

Google Cloud Free Trial gives $300 in Welcome credit valid for 90 days for eligible new billing accounts (cloud.google.com/free/docs/free-cloud-features); the Vertex generative-AI pricing page itself lists no free token allowance but does include 5,000 free grounding queries per month across Gemini 3 models.

Google AI Studio gives free API access to Gemini models — free input and output tokens under per-model rate limits, not a depleting credit. Current-generation Flash models (including Gemini 3.8 Flash) are free-tier eligible. Paid tiers unlock higher limits, context caching, the 50%-off Batch API, and the most advanced models on the same API; free-tier data is used by Google to improve its products, paid-tier data is not.

Estimated based on high free-tier rate limits (RPD) vs paid input/output rates for equivalent usage.

Nebius AI Studio is a European-based GPU cloud platform providing managed inference for top open-source LLMs like Llama 3.1 and DeepSeek R1. It leverages its own EU data centers to offer high-performance, privacy-compliant inference with transparent pay-as-you-go pricing tailored for both developers and enterprises.

AI Studio grants new accounts ~$1 one-time trial credit (startup/promo programs can grant far more); Nebius AI Cloud free-trial program suspended as of 2026-07-13; studio models otherwise pay-as-you-go.

Azure AI Foundry (formerly Azure AI Studio) provides access to a vast catalog of models including OpenAI, Anthropic, and Llama. It features a unified API surface and enterprise-grade management. Pricing is unified under Azure's pay-as-you-go model.

No public free-tier information found in the source reference; treat free-tier availability as unverified rather than confirmed absent.

IBM watsonx.ai is an enterprise AI studio combining machine learning, decision optimization and generative AI, with an Essentials pay-as-you-go plan starting at USD 0/month and a Standard plan starting at USD 1110/month. The free Toolbox playground includes up to 300,000 foundation-model tokens per month, up to 20 compute usage hours (CUH) per month and up to 100 text-extraction documents per month. Model usage is metered per million tokens, for example granite-4h-small at USD 0.0636 input and USD 0.265 output, with all IBM and third-party embedding models at USD 0.10 per million tokens.

The free Toolbox playground grants up to 300,000 foundation-model tokens, 20 compute usage hours and 100 text-extraction documents per month; IBM publishes no USD-denominated credit on the official pages fetched, so no dollar value is asserted.

Tencent AI Studio (aistudio.tencent.com, branded Hy AI Studio and built on Tencent Hunyuan) is Tencent's Chinese-language console for chatting with Hunyuan models, trying multimodal capabilities and managing API access. Tencent Cloud's official Hunyuan billing page states that after completing real-name verification, first activation issues a one-time free call allowance as a free resource pack: 1,000,000 tokens shared across Hunyuan-a13b, Hunyuan-role-latest, Hunyuan-translation, Hunyuan-translation-lite, Tencent HY Vision 1.5 Instruct, Hunyuan-turbos-vision, Hunyuan-t1-vision and Hunyuan-turbos-vision-video, plus a separate 1,000,000 tokens for Hunyuan-embedding, both valid one year. Postpaid list prices start at 0.5 yuan input and 2 yuan output per million tokens for Hunyuan-a13b.

Free grant is a one-time 1,000,000-token resource pack shared across the listed Hunyuan text and vision models, plus 1,000,000 tokens for Hunyuan-embedding, valid 1 year, stated in Tencent Cloud's Hunyuan billing documentation.