Dev Enables Mid-Chain Adaptive Reasoning Effort for GPT-6 in Codex

A developer built a Jev-based tool that lets Codex dynamically adjust GPT-6's reasoning effort mid-chain-of-thought based on task difficulty, cutting costs by about 50%. Notably, changing reasoning effort on GPT-6 no longer invalidates the prompt cache, making mid-run adaptation practical.

2026-09-21 ~ 2026-09-22 · 3 related posts

• Dev Uses Jev to Dynamically Tune GPT-6 Reasoning Effort Inside Codex, Cutting Costs 50% — brandon_galang · 2026-09-21
• Adaptive reasoning for Codex tweaks effort mid-CoT based on task difficulty — daniel_mac8 · 2026-09-22
• GPT-6 prompt cache survives reasoning-effort changes; Codex adapts effort mid-CoT — daniel_mac8 · 2026-09-22