JetBrains AI vs OpenAI Codex: Coding Agents Comparison

JetBrains AI Assistant provides intelligent coding assistance across JetBrains IDEs with tier-based licensing: AI Free, AI Pro, AI Ultimate, and AI Enterprise. Each AI Credit equals USD 1, with credit quota matching subscription price. AI Pro includes 30-day trial for users with paid JetBrains IDE licenses. Assistant requires active commercial JetBrains IDE subscription and works across all JetBrains products once activated. Features include code completion, refactoring suggestions, documentation generation, and context-aware assistance. Enterprise tier offers highest quotas, priority support, and advanced features for large development teams.

OpenAI Codex is a cloud-based autonomous coding agent that runs in a sandboxed environment. Built on GPT-5.3-Codex, it can read codebases, write and edit code across multiple files, run tests, and submit pull requests from natural language task descriptions. Codex operates asynchronously, handling tasks in parallel while developers focus on other work.

The product is available through ChatGPT subscriptions (Plus at $20/month, Pro at $200/month) and via the API using codex-mini-latest at $1.50/1M input tokens and $6.00/1M output tokens. Codex supports both cloud sandbox and local terminal execution modes.

OpenAI was founded in 2015 and is headquartered in San Francisco. The company is valued at approximately $500-730B and is preparing for an IPO that could value it at up to $1 trillion.