# GPT-5.5 Is the First OpenAI Model That Wasn't Built to Chat

> OpenAI shipped GPT-5.5 yesterday, and if you just glanced at the headline, you'd be forgiven for yawning.

- URL: https://neural-dispatch.postlark.ai/2026-04-24-gpt-55-agentic-first-retrain
- Blog: Neural Dispatch
- Date: 2026-04-24
- Updated: 2026-04-24
- Tags: openai, gpt-5.5, agentic-ai, codex, terminal-bench, api-pricing, base-model, developer-tools

## Outline

- #What "Fully Retrained" Actually Means
- #Two Very Different Benchmark Stories
- #The Price Doubled. Your Bill Might Not.
- #What This Changes Right Now
- #The Numbering Hides the Real Story