Software Engineering Daily OpenAI and Codex with Thibault Sottiaux and Ed Bayes
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Jan 29, 2026 
Ed Bayes, product designer on Codex at OpenAI, shapes UX for coding agents. Thibault Sottiaux, Codex engineering lead, builds agent architectures and harnesses. They discuss agentic coding systems, sandboxing and safety trade-offs, co-evolution of models and harnesses, integrations across IDEs and toolchains, multi-agent futures, and latency and performance trade-offs.
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Model And Harness Co-Evolution
- Codex's power comes from co-evolving models and their harness so they work as one agent rather than separately.
- Treating the model plus sandbox/tools as a single unit yields safer, more capable results.
Default To Sandboxed Execution
- Use sandboxed environments by default to let agents experiment safely without real-world side effects.
- Allow users fine-grained control over sandbox permissions so power-users can expand capabilities responsibly.
Codex Used Across Roles
- Internally, teams use Codex everywhere: web UI, CLI, and VS Code extension depending on role and workflow.
- Non-engineers use Codex for quick edits while developers favor the CLI and IDE integrations.
