b.ai
Third-party OpenAI-compatible aggregator with a reported large free-credit signup bonus.
- Free credit
- $0.5
- Credit window
- 30 days
- Card required
- No
b.ai scores 5.2/10 for free value in LLM. The main constraint: Reported ~500k free credits on signup via Google login with no card/verification (unconfirmed; verify current limits).
Free value score
5.2 / 10Show the math
Key metrics
Models
0 free · 27 totalLimits may be stale — last re-verified outside this section's freshness window.
| Model | Family | AA | Access |
|---|---|---|---|
| Claude Opus 4.8 | Claude | 55.7 | paid |
| GPT-5.5 | GPT | 54.8 | paid |
| GPT-5.4 | GPT | 51.4 | paid |
| Gemini 3.5 Flash | Gemini | 50.2 | paid |
| Gemini 3.1 Pro | Gemini | 46.5 | paid |
| MiniMax M3 | MiniMax | 44.4 | paid |
| DeepSeek V4 Pro | DeepSeek | 44.3 | paid |
| Claude Opus 4.7 | Claude | 42.7 | paid |
| GPT-5.2 | GPT | 42.2 | paid |
| DeepSeek V4 Flash | DeepSeek | 40.3 | paid |
| GLM-5.1 | GLM | 40.2 | paid |
| GPT-5.4 Mini | GPT | 40 | paid |
| GLM-5 | GLM | 39.5 | paid |
| GPT-5.4 Nano | GPT | 38.2 | paid |
| Kimi K2.5 | Kimi | 38.1 | paid |
| MiniMax M2.7 | MiniMax | 38.1 | paid |
| Claude Opus 4.6 | Claude | 37.8 | paid |
| Qwen3.6-27B | Qwen | 37 | paid |
| Claude Sonnet 4.6 | Claude | 35.9 | paid |
| Claude Opus 4.5 | Claude | 34.7 | paid |
| Gemini 3 Flash | Gemini | 27.4 | paid |
| DeepSeek V3.2 | DeepSeek | 24.7 | paid |
| Claude Haiku 4.5 | Claude | — | paid |
| Claude Sonnet 4.5 | Claude | — | paid |
| GPT-5 Mini | GPT | — | paid |
| GPT-5 Nano | GPT | — | paid |
| GPT-5.4 Pro | GPT | — | paid |
| GPT-5.5 Instant | GPT | — | paid |
What you get
Reported ~500k free signup credits (verify)
Google login, no card/verification reported
Models: DeepSeek V4 Pro & Flash, Gemini 3.5 Flash, MiniMax M3
OpenAI-compatible API
Gotchas
- ~500k credits, one-time
Signup grants a reported one-time pool of roughly 500,000 internal credits that does not regenerate once spent.
- Promo can vanish anytime
The signup bonus is a time-limited growth promo that may shrink, change, or disappear without notice, so the credits cannot be relied on long-term.
- Unsafe for production
It is an unofficial third-party proxy that can see all prompts and any keys sent through it, making it unsuitable for sensitive or production workloads.
- Account-farming risks ban
The promo openly encourages creating extra accounts via gmail +aliases to farm credits, which violates typical ToS and risks account bans.
Sources
-
"1 USD = 1,000,000 Credits"
https://docs.b.ai/llmservice/pricing-and-usage/ -
"Free bonus Credits are valid for 30 days from the date they are issued, including Credits granted for new-user registration and Credits granted through top-up promotions. Any unused portion automatically expires after the validity period."
https://docs.b.ai/llmservice/pricing-and-usage/ -
"Plan Pro ... Price: $200/month ... Approximately 50-500 messages per 12 hours ... A valid invite code is required for purchase"
https://docs.b.ai/llmservice/pricing-and-usage/ -
"B.AI is a blockchain-native AI relay station that provides anonymous, crypto-settled access to Claude, GPT, Gemini, and other major large language models"
https://www.kucoin.com/blog/bai-explained-how-justin-sun-ai-relay-station-is-reshaping-access-to-claude-gpt-and-ai-agents
