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.

Tokeness (tokeness.io) is an AI model aggregator providing access to 50+ frontier models via a standard, unified API protocol. It focuses on stability and security, relaying requests without retaining conversation data. It includes a referral program and free routing options.

New users get only ~¥0.5 (≈$0.07) trial credit at signup, after which calls require prepayment (deducted from balance); there is no public, sustained free allowance, so it is a paid aggregator.

Inference.net (formerly Kuzco) is a distributed GPU inference network offering a unified OpenAI-compatible API for open-source models. It specializes in low-cost deployment of Llama 3.1 models and offers substantial initial credits ($1 + $25 for surveys) for new developers.

~$1 credit on signup + $25 more after replying to an email survey (verified) = ~$26 total; free tier ~30 req/min (paid ~250/min); converts to PAYG after credits are spent.

Grok X Search (xAI): x_search tool enabling Grok models to run keyword/semantic search, user search, and thread fetch over real-time X (Twitter) data; usable via xAI SDK, OpenAI-compatible Responses API, or Vercel AI SDK. Billed at $5 per 1,000 tool calls (changes Sep 21, 2026 to $5/1k posts + $10/1k profiles fetched); new xAI API accounts get $25 promotional credits; no free tier specific to X Search.

New console.x.ai accounts receive $25 promotional API credits usable against model + X Search usage (one-time).

xAI (founded by Elon Musk) offers the official API for the Grok series of LLMs. Known for leading benchmarks in coding and reasoning, the Grok-4.6 flagship model is available via an OpenAI-compatible API, featuring low-latency inference and high agentic tool-calling capabilities.

No permanent free tier; ~$25 promo credit on signup (30-day expiry, varies by region/promotion). $150/mo data-sharing credits still listed by 2026 guides despite mid-2025 end reports — rely on what the console shows.

Voyage AI specializes in state-of-the-art embedding models and rerankers. It provides a managed API for high-quality vector embeddings (voyage-4 family) and efficient reranking, optimized for RAG applications. Offers a highly generous free tier for developers.

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

Feifeimiao (api.feifeimiao.top) is a Chinese third-party relay service offering an OpenAI-compatible API gateway. Built on the New-API framework, it aggregates various models and focuses on providing access to tools like Codex and Claude Code for developers in the region.

$10 trial credit on signup; promotional $20 weekly-limited cards for new and existing users (weekly expiry). The core is paid subscriptions (Small ¥60 (≈$8.93)/30d ≈ $20/day, Medium ¥150 (≈$22.32)/30d ≈ $60/day).

Cun.ai is a commercial AI relay aggregator based on the New-API framework, providing access to GPT, Claude, and DeepSeek. It targets Chinese developers with localized payment methods and a substantial signup credit promotion.

Signup credit up to approx. $20.83 (RMB 140) with redemption codes.

Amazon Polly is AWS's neural text-to-speech service converting text into lifelike speech. Billed per 1 million characters across voice tiers: Standard ($4), Neural ($16), Long-Form ($100), Generative ($30). Free tier: 5M Standard chars/mo (12 months for Neural/Long-Form/Generative).

Free tier: 5M Standard chars/mo × $4/1M = $20/mo value (ongoing); plus 1M Neural + 500k Long-Form + 100k Generative chars/mo for first 12 months (~$16+$50+$3 = ~$69/mo extra). $20 quoted on the recurring Standard-voice basis.

Alibaba Cloud Model Studio (Bailian) is the official international platform for Qwen and other foundation models. It offers 1 million free tokens per model for new users and a 50% discount on batch inference.

New users: free token quota per model (~1M each, tens of millions cumulative; campaign cites 70M+), 90-day validity, select regions (e.g. Singapore/International) → ≈$20 blended at Qwen list prices; then PAYG.

Camel-Hub (api.camel-hub.com) is a commercial AI API relay aggregating 330+ models. It emphasizes prompt caching to reduce user costs and requires real-name verification (KYC) for full access. Free access is limited to tool-class models like Suno and Midjourney.

$20 credit granted after real-name verification.

DeepInfra is a high-speed inference cloud for open-source AI models. It provides an OpenAI-compatible API for text generation, embeddings, and image generation. Authentication uses a standard API key from its dashboard.

$20 trial credit reported for new accounts (DeepStart).

Google AI Studio (ai.google.dev) is the official developer platform for Google's Gemini model family. It offers both a generous free tier for prototyping and a paid production tier with higher rate limits, context caching, and data privacy guarantees.

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

Lightning AI (LitAI) provides a unified gateway to frontier models through an OpenAI-compatible API. New users receive 40 million free tokens (approx. $15 in credits) to test models like Claude, GPT, and Gemini. Usage beyond the initial credit is billed as pay-as-you-go.

~30M free tokens per user per month (~15 credits = $15 value), no card required; credits refresh monthly and expire if unused; plus 1 free 4-CPU Studio and 10GB Drive.

NLP Cloud is a commercial provider hosting various open-model APIs (Llama, Mixtral, Dolphin) with both pay-as-you-go and subscription options. It grants new users $15 in free credit upon phone verification.

Pay-As-You-Go plan auto-grants ~$15 free credit at signup (phone verification required); large models (GPT-OSS 120B, Llama 3.1 405B/3.3 70B) ~$0.0018/1K tokens; PAYG after credit is used.

StepFun Open Platform is the official developer platform of a Chinese AI unicorn, serving its Step-series multimodal models via an OpenAI-compatible API. It supports text, vision, and end-to-end speech models with tiered rate limits and a credits-based free allowance for new accounts.

Starter ~500K free tokens per model; ~2M tokens/day after activating collaboration-reward program (~$15/mo at StepFun's own ~$0.2-0.6/1M pricing); Step Plan 15-day trial extendable via referrals. Now platform.stepfun.ai.

MonkeyAPI (monkeyapi.apimonkey.online) is an anonymous individual relay service built on the New API framework. In late 2026, the service operator reported penalties for violations and announced plans to migrate, significantly reducing quotas and referral benefits.

Previously offered registration credit and check-in/referral bonuses, but notices state it is 'cutting referral and registration quotas for cost control' and will adjust after migrating; no stable public free flagship quota.

Sarvam AI is a leading Indian AI startup focused on large-scale models for Indic languages. Their API platform provides access to the Sarvam series models for text and voice, targeting applications in the Indian market with high-performance regional language support.

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

AI21 Labs is an established LLM vendor known for its Jamba model family. The developer platform (api.ai21.com) offers OpenAI-style endpoints for its high-performance models, with a trial credit for new accounts to explore its capabilities.

$10 trial credit valid for 3 months for new accounts.

Eden AI is a commercial AI aggregation gateway providing a single API to 500+ models. It features cost tracking, automatic fallback, and a unified format for LLMs, vision, and translation. Details were checked against the provider's own page at www.edenai.co.

$10 starter credit reported for new users.

FreeModel is a multi-model gateway that intelligently routes requests to the best-performing open models. It supports both OpenAI and Anthropic API formats and provides automatic model fallback and smart provider selection to optimize for quality.

Signup credits land instantly, no card. Community reports conflict: $10 signup credit (phone/Telegram verify) up to claims of ~$66/week (~$300 cumulative) - authenticity unconfirmed. Conservative: $10.

Upstage Console provides an OpenAI-compatible API for their high-performance Solar models. It features a developer-friendly $10 signup credit and commitment-based tiers for businesses requiring higher rate limits and support.

One-time $10 credit valid for 3 months for new signups.

Tavily: search API purpose-built for AI agents — basic (1 credit) and advanced (2 credits) search, extract, map, crawl, and Research (dynamic credits). Free 1,000 credits/month refreshed on the 1st, no card; pay-as-you-go $0.008/credit; monthly plans $30-$100+ at $0.0075-$0.005/credit; enterprise custom. Free for students program.

1,000 free credits/month × $0.008/credit PAYG rate = $8.00/month equivalent (basic searches).

FreeTheAi is a free OpenAI-compatible API gateway aggregating 80+ models behind a single base URL. It operates via Discord-based key signup and daily check-ins, emphasizing persistent free access for developers and roleplay users without credit card requirements.

Fully free, no card; daily /checkin (key validation + human challenge) required before calls. Default cap 250 successful calls/day (role-based bumps) ~ $7.5/mo equivalent at ~1K tokens/call, $1/1M tokens.