ChatGPT Plus
$20/month
- 30-150 Codex tasks per 5 hours
- Cloud sandbox execution
- PR creation and code review
OpenAI Codex — Coding Agents Platform
Founded 2015|San Francisco, CA|1001-5000 people
What is OpenAI Codex?
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.
Strengths and tradeoffs
What this tool does well, and the limitations to keep in mind.
Pros
- Runs tasks autonomously in parallel in sandboxed environments
- Strong multi-file editing and codebase-level reasoning
- Vision capabilities for interpreting screenshots and UI mocks
- Available via ChatGPT subscription and API
- GPT-5.3-Codex is the most capable agentic coding model
Cons
- Still fails 43% of professional-level tasks
- Cannot access the internet for dependency resolution
- Requires 3-5 iterations on average for error-free output
- Desktop app limited to macOS with usage caps
Plans & pricing
What's included in each plan, and how the tiers compare.
ChatGPT Pro
$200/month
- 300-1,500 tasks per 5 hours
- Higher rate limits
- Priority access
API (codex-mini-latest)
$1.50/1M input, $6.00/1M output
- 75% prompt caching discount
- Responses API access
- Programmatic integration
Enterprise
Custom
Contact sales for a quote
- SCIM, EKM, user analytics
- Custom data retention
- No training on business data
Using OpenAI Codex with Respan
Respan provides observability for AI-generated code workflows powered by OpenAI Codex. Teams can monitor code quality, track task completion rates, and evaluate the accuracy of Codex-generated changes before they reach production.
- Monitor Codex task success rates and iteration counts
- Evaluate quality of AI-generated code changes
- Track API token usage and costs per coding task
- Compare Codex performance across different prompt strategies
Best OpenAI Codex alternatives & competitors
Top companies in Coding Agents you can use instead of OpenAI Codex.
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Emdash
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Last verified: March 1, 2026