1. [n. d.]. billing for AI21 LAB. https://studio.ai21.com/pricing.
2. [n. d.]. billing for aixcoder. shorturl.at/evxzA.
3. [n. d.]. billing for amazon p2. https://aws.amazon.com/ec2/instance-types/p2/.
4. [n. d.]. billing for GitHub Copilot. https://docs.github.com/en/billing/managing-billing-for-github-copilot/about-billing-for-github-copilot.
5. [n. d.]. Codex. https://openai.com/blog/openai-codex/.