GPT 5.6 Sol (medium) in ChatGPT for planning tasks

Melvin Vivas · X post · 2026-08-23 · Open on X

Topics: LLM Fundamentals, AI Dev Tools & Productivity · Level: beginner

Summary

The creator recommends GPT 5.6 Sol at medium reasoning effort in ChatGPT for planning. He says it balances speed and reasoning well. This is a short tip on picking a model and reasoning level for each task.

Key points

• GPT 5.6 Sol at medium reasoning is a good fit for planning tasks.
• Medium effort balances response speed against reasoning depth.
• Choose the reasoning level for the task: planning doesn't always need the highest setting.

Resources mentioned

• GPT 5.6 Sol · tool · openai.com · paid
  A GPT-family model available through an API, whose API and credit pricing was cut by over 20% for three months.
  Also in: Creator's Top 3 Closed Models: Fable 5, GPT 5.6 Sol, Grok 4.6 (Melvin Vivas on X · notes), Coworker v0.3.1: Telegram Streaming Sync, Built Fast with Codex (Melvin Vivas on X · notes), Coworker: Open-Source Grok Bot Clone Built on Pi and CopilotKit (Melvin Vivas on X · notes), GPT-5.6 Sol Price Cuts on Vercel AI Gateway (70% Off Input) (Melvin Vivas on X · notes) and 12 more
• ChatGPT · tool · chatgpt.com · free · recommended by both Bashiri Smith & Melvin Vivas
  OpenAI's AI assistant (web, desktop and mobile apps), used for chat, coding, writing and image generation.
  Also in: Sign in with ChatGPT: Setting Usage Limits for Each App (Melvin Vivas on X · notes), Dots Demo: A Voice AI Agent Handling Travel Booking and Feedback Triage (Melvin Vivas on X · notes), ChatGPT Can Commit Code Directly to Your GitHub Repo (Melvin Vivas on X · notes), OpenAI Dots: Agents Inside ChatGPT That Debug, Fix, and Open PRs (Melvin Vivas on X · notes) and 23 more

Try this

• Try GPT 5.6 Sol at medium reasoning in ChatGPT for planning work.