AI article
GPT-5.5 Released: First Fully Retrained Base Model Since GPT-4.5, 1M Context, $5/$30 Pricing
OpenAI shipped GPT-5.5 on April 23, 2026 as the first ground-up retrain since GPT-4.5, featuring a 1M-token context window and doubled per-token pricing.
Dev.to | Apr 24, 2026 | Owen