GPT-4o Fully Retired Today — The Practical Upgrade Path for Local Stack Users | Model Release
OpenAI has fully retired GPT 4o from all ChatGPT plans as of April 3, 2026. The MMLU performance gap between open source and proprietary frontier models has na…
Published on MyPrivateClaw
Apr 3, 2026, 7:47 PM UTC
Coverage date
Apr 3, 2026
Last updated
Apr 4, 2026, 5:23 AM UTC
News summary
OpenAI has fully retired GPT 4o from all ChatGPT plans as of today, April 3, 2026. If your stack still calls the gpt 4o endpoint, you have a migration decision to make. The question is not just which OpenAI model to move to — it is whether the migration moment is the right time to move off the proprietary API entirely. The GPT 4o replacement is GPT 5.4: 83% on GDPVal, 1 million token context window, leading results on computer use benchmarks, and 33% fewer errors than GPT 5.2. GPT 5.4 Mini and GPT 5.4 Nano were released March 17 for cost sensitive workloads. The local inference argument has never been stronger, and the benchmark data supports it. The MMLU performance gap between open source and proprietary frontier models has narrowed from 17.5 percentage points to 0.3 percentage points in twelve months. That is not a rounding error — it is convergence. $1 documents this trajectory agai…