GPT-5.5 Released: First Fully Retrained Base Model Since GPT-4.5, 1M Context, $5/$30 Pricing

📰 Dev.to AI

Learn about GPT-5.5, the first fully retrained base model since GPT-4.5, and its improved performance and pricing

intermediate Published 24 Apr 2026
Action Steps
  1. Try out GPT-5.5 using the ofox platform by swapping in openai/gpt-5.5
  2. Evaluate the performance of GPT-5.5 using benchmarks like Terminal-Bench 2.0
  3. Compare the pricing of GPT-5.5 to previous models and assess the cost-benefit analysis
  4. Apply GPT-5.5 to your existing chatbot or language-based applications
  5. Test the limits of GPT-5.5's 1M context size and its impact on model performance
Who Needs to Know This

Developers and data scientists working with large language models can benefit from GPT-5.5's improved performance and context size, while product managers should be aware of the pricing changes

Key Insight

💡 GPT-5.5 is the first fully retrained base model since GPT-4.5, offering improved performance and a larger context size, but at a higher price point

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🚀 GPT-5.5 is here! Improved performance, doubled context size, and new pricing. Try it out now!
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