OpenAI Details New Codex Workflows and Model Routing
thesaraharminta · x · 2026-07-11
The OpenAI Codex team shared usage tips for GPT-5.6 / Codex in ChatGPT during a Reddit AMA, noting Codex now has over 5 million weekly users and has rolled out 150+ features and improvements in the past three months.
Model Selection and Routing
- Sol Medium: The default choice for most tasks
- Sol Ultra: For genuinely difficult tasks
- Terra: Fast, non-coding, or cost-sensitive scenarios; performance approaches GPT-5.5 on some tasks at a lower cost
- Luna: Used for subagents
When to Use Which Model
- Minor tweaks, quick questions, doc cleanup: Lightweight model, low reasoning
- Small bugs, reproducible issues: Standard Sol Medium
- Ambiguous bugs, unfamiliar repos, cross-file refactors: Sol with higher reasoning
- Migrations, security-sensitive changes, production incidents: Sol Ultra, paired with planning, verification, and testing
The overall strategy: delegate light tasks to cheaper models and reserve complex, high-risk coding for models with stronger reasoning.
Related event: Codex Hits 5M Weekly Active Users and Shares Usage Tips(3 posts)→
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