Seems to be quite similar to 5.3-codex, but somehow almost 2x more expensive: https://aibenchy.com/compare/openai-gpt-5-4-medium/openai-gpt-5-3-codex-medium/ope

Seems to be quite similar to 5.3-codex, but somehow almost 2x more expensive: https://aibenchy.com/compare/openai-gpt-5-4-medium/openai-gpt-5-3-codex-medium/openai-gpt-5-2-medium/ https://aibenchy.com/compare/openai-gpt-5-4-medium/openai-gp...