The Ultimate ChatGPT 5 Model Comparison: GPT-5.0 to GPT-5.6
OpenAI made GPT-5.6 public on July 9, 2026, and it is now the most capable ChatGPT model you can actually run. The flagship Sol tier scores 88.8% on Terminal-Bench 2.1 (and 91.9% in its Sol Ultra high-effort mode), edging GPT-5.5’s own 88.0% on the same agentic-coding test, and it ships alongside two cheaper tiers, Terra and Luna, that undercut the previous generation on price. In under a year, OpenAI has shipped seven distinct versions of GPT-5, each with its own identity and price point. If you have lost track of what separates GPT-5.0 from GPT-5.6, this guide covers every model in the family, release dates, context windows, benchmarks, pricing, and […]
