Free credits / 免费额度
Gemini API 免费档:部分模型可免费使用输入和输出 token
The official pricing page says you can start building free of charge, with generous limits. The Free tier includes free input and output tokens on certain models, plus access to Google AI Studio. Some models are not on the Free tier, for example Gemini 4 Carbon.
Source:Google AI for Developers · https://ai.google.dev/gemini-api/docs/pricing
OpenRouter 免费模型变体(:free)可按日限额调用
Variants whose model ID ends in :free can be called at no cost. If you have purchased fewer than 10 credits in total, the limit is 20 requests per minute and 50 per day. After purchasing at least 10 credits in total, the daily cap rises to 1,000 requests. The daily count is measured on the current UTC day.
Source:OpenRouter · https://openrouter.ai/docs/api_reference/limits
GroqCloud Free 套餐:0 美元起步试用 API
The official plans page offers a $0 Free plan for building and testing APIs on Groq, with community support. Exact rate limits are shown on your account Limits page.
Source:Groq · https://console.groq.com/settings/billing/plans
Student & education / 学生/教育
符合条件的美国大学生可免费领取 12 个月 Google AI Pro
For eligible U.S. college students ages 18 and older. Both new users and students whose 2025 AI Pro trial has ended may qualify. It includes higher Gemini usage limits, 5 TB of storage, Gemini Spark, and access to Gemini Omni for 1 year. A valid form of payment is required at sign-up. Unless cancelled, Google AI Pro automatically charges $19.99 per month after the trial ends. Redeem by December 31, 2026.
Source:Google · https://gemini.google/students/Deadline:December 31, 2026
美国和加拿大大学生可领取 100 美元 Codex 积分
For current students enrolled at degree-granting universities in the United States or Canada who reside in the United States or Canada when claiming. Eligibility is subject to verification. Limit one offer per student. After verification, $100 in ChatGPT credits (shown as 2,500 credits) are added to the ChatGPT account used to claim the offer, for use in Codex. These are not API credits. Credits expire 12 months after the grant date.
Source:OpenAI · https://developers.openai.com/community/students
GitHub Copilot Student:验证学生可获得代码补全和 GitHub AI Credits
The GitHub Student Developer Pack page states that verified students can use Copilot Student. The plan includes unlimited code completions, an allowance of GitHub AI Credits, and limited chat and agent usage with models available through auto model selection only.
Source:GitHub Education · https://education.github.com/pack
已验证院校学生和教授可免费使用一年 ElevenReader Ultra
The official students page states that students and professors at verified institutions receive one year of ElevenReader Ultra free when they sign up with a .edu (or equivalent) email address.
Source:ElevenLabs · https://elevenlabs.io/students