GPT-5.6 Sol

Why GPT-5.6 Sol is Best

1. Frontier Coding Intelligence: GPT-5.6 Sol is OpenAI's flagship tier model built specifically for advanced problem-solving, long-horizon multi-step programming, and complex repository edits. [1, 2]
2. Leaderboard-Topping Performance: It sets the state-of-the-art benchmark for agentic coding, command-line operations, and debugging. It is vastly superior to the older GPT-5.5 and GPT-5.4 models in your dropdown list. [1, 2]
3. Persistent Fixes: It is highly optimized for tracking down errors across multiple files, testing code, and implementing complete software builds rather than just single snippets. [1, 2]

⚙️ How to Set Your Reasoning Tier

Your menu allows you to pair the model with a reasoning effort layer: [1]

1. Extra High: Choose this for complex backend architecture, writing algorithms from scratch, or fixing deeply broken codebases.
2. High / Medium: Excellent for everyday coding tasks, quick scripts, front-end styling edits, and automated code documentation where you need a faster turnaround time. [1, 2, 3]

⚖️ The Other Tiers

1. GPT-5.6 Terra: Good as a default if you are burning through your prompt limits quickly, matching previous top capabilities at roughly half the token cost. [1, 2]
2. GPT-5.6 Luna: Built for speed and lighter, high-volume tasks. Do not use it for complex debugging, as its deep reasoning capabilities are limited compared to Sol. [1, 2, 3]