AI API services · Free AI Index

LongCat API · status check

Official API exists; no free quota confirmed

Unknown / do not call free · Email / phone

API confirmed; free quota not confirmed

Unknown / check account · China account

Very low unit price; not a free quota

Pay-as-you-go / no expiry · International API

Selected Zen models · input, output and cache listed as Free

Limited time / model pool can change · Global / OpenCode account

New-user free quota · usually 1,000,000 tokens per model

90 days from activation / model eligibility · Beijing region models

Free tier: input, output and context caching listed as Free of charge

Ongoing free tier; limits and terms can change · Google account; availability may vary by region

Free plan with per-model RPM / RPD / TPM limits (e.g. gpt-oss-120b: 30 RPM · 1K RPD · 8K TPM)

Ongoing free plan; exact limits per model can change · Groq account; rate limits apply at organization level

Free trial: $5 in free credits after account creation

One-time credits; consumed by usage · Cerebras account

:free variants: 20 req/min; 50 req/day (under 10 credits purchased) or 1000 req/day (10+ credits)

Ongoing free usage limits; caps can change · OpenRouter account; daily caps depend on lifetime credit purchases

Free mode (default): lowest rate limits, intended for evaluation and prototyping

Ongoing default tier; limits can change · Mistral account

Trial API key: free, rate-limited, not permitted for production or commercial use

Ongoing trial keys; rate limits apply · Cohere personal account

Generous free tier included; additional credits for PRO users and organizations

Monthly included credits; unused quota does not roll over · Hugging Face account

Selected models listed at ¥0 (free) on the official price list, plus paid models

Free listing can change; recheck the price page · SiliconFlow account; China registration

API-Inference is free for registered users; dynamic rate limits and 魔粒 (MoLi) deduction apply

Ongoing free service; model list iterates as new open models release · ModelScope account + Aliyun binding + real-name verification