Conclusion: Google has the deepest pockets.
Our research shows AWS and Azure are stingy with free tiers, and OpenAI is out of the question. As of 2026, GCP (Google Cloud)'s free tier is the strongest and only solution.
Why "GCP + Antigravity"?
| Service | Free Tier Details | Gen AI Restrictions |
|---|---|---|
| Google Cloud (GCP) | $300 / 90 Days | No Limits (Vertex AI Fully Open) |
| AWS | 12 Months Free (Select Services) | Bedrock (Gen AI) Excluded |
| Azure | $200 / 30 Days | OpenAI needs approval (Hassle) |
| OpenAI API | $5 (First 3 Months) | GPT-5 drains this instantly |
Step 1: Grab Google's $300
Google Cloud Platform (GCP) gives every new registrant $300 (approx. ¥45,000 - ¥50,000) in credits. There is no reason not to use this.
What can you do?
This credit can be used freely on Vertex AI, Google's AI platform. This means:
- 💎 Gemini 3 Pro: Almost unlimited use
- 🤖 Claude 3.5 Sonnet: Available via Vertex AI (More stable than Anthropic)
- 🎥 Google Veo: Video generation covered by credits
⚠️ Caution
Credits expire after 90 days. However, recreating a development account (aka the "Ban-Evasion Method") is a gray area technique... (*Please check Google's Terms of Service).
Step 2: Secure "Veo" with Google AI Premium
Separate from GCP credits, there is a free trial (usually 1-2 months) for the consumer-facing Google One AI Premium.
The Target Here is "Veo Credits"
Subscribing to this plan grants monthly generation credits for the video AI Veo. With Sora 2 now paid, this is one of the few ways to generate high-quality video for free.
The Trick: If you cancel before the trial ends, the cost is $0. Set a reminder for the "Cancellation Date" on your calendar.
Step 3: Integrate with Antigravity
Once you issue an API key in GCP and get Veo access in Google One, combine them in one place. Opening the GCP console every time is a pain.
Passing GCP API keys to "Antigravity" or "Cursor" creates the ultimate free dev environment.
Recommended Client Settings
- Cursor: Enter your Vertex AI API key in settings. Coding becomes free.
- LibreChat / Dify: Feed your keys to these locally hosted tools to use GPT-5 class models via Web UI unlimitedly.
Summary
The Reiwa Alchemy Set
- ✅ GCP Free Tier: Vertex AI ($300) → Use as API
- ✅ Google One Trial: Gemini Advanced & Veo → Chat / Video Gen
- ✅ Cursor/Dify: The "Vessel" to make these usable
As of 2026, this is the smartest and most powerful way to walk the AI landscape.