AI News Digest - 2026-04-27

Sun, 26 Apr 2026 20:16:13 GMT

1. OpenAI retired its dedicated Codex coding model, folded Codex capabilities into the main GPT-5.5 model, and advised developers to start prompts from minimal baselines rather than carry over older prompt templates.

2. OpenAI released GPT-5.5, which topped benchmarks but continued to hallucinate frequently and was offered at about a 20 percent higher API cost.

3. 500 investment bankers reviewed outputs from leading models including GPT-5.4 and Claude Opus 4.6 and found none of the AI outputs to be ready for client delivery, though a majority said they would use outputs as starting points.

4. Researchers at Chalmers University of Technology and the Volvo Group argued that AI agents were not replacing software engineering but were expanding the discipline far beyond code, changing the scope of engineering work.

# References

1. [https://the-decoder.com/openai-kills-its-dedicated-coding-model-codex-again-folding-it-into-gpt-5-5/](https://the-decoder.com/openai-kills-its-dedicated-coding-model-codex-again-folding-it-into-gpt-5-5/)

[OpenAI kills its dedicated coding model Codex again, folding it into GPT-5.5](https://the-decoder.com/openai-kills-its-dedicated-coding-model-codex-again-folding-it-into-gpt-5-5/)

1. [https://the-decoder.com/openai-says-old-prompts-are-holding-gpt-5-5-back-and-developers-need-a-fresh-baseline/](https://the-decoder.com/openai-says-old-prompts-are-holding-gpt-5-5-back-and-developers-need-a-fresh-baseline/)

[OpenAI says old prompts are holding GPT-5.5 back and developers need a fresh baseline](https://the-decoder.com/openai-says-old-prompts-are-holding-gpt-5-5-back-and-developers-need-a-fresh-baseline/)

1. [https://the-decoder.com/gpt-5-5-tops-benchmarks-but-still-hallucinates-frequently-at-a-20-percent-higher-api-cost/](https://the-decoder.com/gpt-5-5-tops-benchmarks-but-still-hallucinates-frequently-at-a-20-percent-higher-api-cost/)

[GPT-5.5 tops benchmarks but still hallucinates frequently at a 20 percent higher API cost](https://the-decoder.com/gpt-5-5-tops-benchmarks-but-still-hallucinates-frequently-at-a-20-percent-higher-api-cost/)

1. [https://the-decoder.com/500-investment-bankers-review-ai-outputs-and-find-none-ready-for-client-delivery/](https://the-decoder.com/500-investment-bankers-review-ai-outputs-and-find-none-ready-for-client-delivery/)

[500 investment bankers review AI outputs and find none ready for client delivery](https://the-decoder.com/500-investment-bankers-review-ai-outputs-and-find-none-ready-for-client-delivery/)

1. [https://the-decoder.com/ai-agents-arent-replacing-software-engineering-but-expanding-it-far-beyond-code-researchers-argue/](https://the-decoder.com/ai-agents-arent-replacing-software-engineering-but-expanding-it-far-beyond-code-researchers-argue/)

[AI agents aren't replacing software engineering but expanding it far beyond code, researchers argue](https://the-decoder.com/ai-agents-arent-replacing-software-engineering-but-expanding-it-far-beyond-code-researchers-argue/)