LLM APIs with permanent free tiers for text inference.

_{All endpoints are OpenAI SDK-compatible unless noted. Each link points to the provider's API key page.}

Contents

• Provider APIs
• Inference providers
• Glossary

Provider APIs

APIs run by the companies that train or fine-tune the models themselves.

Aion Labs 🇮🇱

Permanent free tier, no credit card required. 15 RPM, 20K tokens/day. Specialized for roleplay and storytelling.

Base URL: https://api.aionlabs.ai/v1

Model Name	Context	Max Output	Modality	Rate Limit
Aion 2.5	128K	32K	Text (roleplay)	15 RPM, 20K TPD
Aion 2.0	128K	32K	Text (roleplay)	15 RPM, 20K TPD
Aion-RP 1.0 (8B)	32K	~8K	Text (roleplay)	15 RPM, 20K TPD

Cohere 🇨🇦

Free "Trial" API key, no credit card. 1,000 API calls/month. Non-commercial use only.

Base URL: https://api.cohere.com/v2

Model Name	Context	Max Output	Modality	Rate Limit
Command A+ (218B)	128K	4K	Text	20 RPM
Command A (111B)	256K	4K	Text	20 RPM
Command R+	128K	4K	Text	20 RPM
Command R	128K	4K	Text	20 RPM
Command R7B	128K	4K	Text	20 RPM

Google Gemini 🇺🇸

Free tier unavailable in EU/UK/Switzerland. Free-tier prompts may be used by Google to improve products. [^1]

Base URL: https://generativelanguage.googleapis.com/v1beta

Model Name	Context	Max Output	Modality	Rate Limit
Gemini 3.5 Flash	1M	64K	Text + Image + Audio + Video	15 RPM, 1,500 RPD
Gemini 3.1 Flash-Lite	1M	65K	Text + Image + Audio + Video	30 RPM, 1,500 RPD
Gemini 2.5 Flash	1M	65K	Text + Image + Audio + Video	15 RPM, 1,500 RPD
Gemini 2.5 Pro	2M	65K	Text + Image + Audio + Video	5 RPM, 50 RPD

Mistral AI 🇫🇷

Free "Experiment" plan, no credit card. ~1B tokens/month. Prompts may be used to improve models.

Base URL: https://api.mistral.ai/v1

Model Name	Context	Max Output	Modality	Rate Limit
Mistral Medium 3.5 (128B)	256K	256K	Text + Image + Code	~1 RPS, 500K TPM
Mistral Small 4	256K	256K	Text + Image + Code	~1 RPS, 500K TPM
Mistral Large 3	256K	256K	Text	~1 RPS, 500K TPM
Mistral Nemo (12B)	128K	128K	Text	~1 RPS, 500K TPM
Codestral	256K	256K	Code	~1 RPS, 500K TPM
Pixtral Large	128K	128K	Text + Image	~1 RPS, 500K TPM

Z AI (Zhipu AI) 🇨🇳

Permanent free models, no credit card required.

Base URL: https://open.bigmodel.cn/api/paas/v4

| Model Name | Context | Max Output