{"slug": "codex-5-4-vs-5-5-pricing-and-quality", "title": "Codex 5.4 vs 5.5 pricing and quality", "summary": "A developer tested GPT 5.4 and GPT 5.5 across four prompt detail levels, finding that GPT 5.4 with a highly detailed prompt achieves results nearly as good as GPT 5.5. The best GPT 5.4 output scored 9.0/10, close to GPT 5.5's top score of 9.4/10, offering a lower-cost alternative with minimal quality loss.", "body_md": "You can get very close results to GPT 5.5 by using **GPT 5.4 with a highly detailed prompt**.\n\nI ran a small test to check this properly. I generated the same technical content into summaries using both GPT 5.4 and GPT 5.5, across four different prompt detail levels (Low to XHigh). Then I asked ChatGPT to rank all 8 outputs blindly, without giving it any scoring categories or guidelines — so my own preferences wouldn’t influence the result.\n\nHere’s how it turned out:\n\n**Rankings (1 = best):**\n\nGPT 5.5 XHigh — 9.4/10\n\nBest overall balance of technical depth, accuracy, and framing.\n\nGPT 5.4 XHigh — 9.0/10\n\nExtremely close to the top. Clean, well-structured, and strong.\n\nGPT 5.4 High — 8.7/10\n\nSolid and grounded, with good references to the source material.\n\nGPT 5.5 Medium — 8.5/10\n\nGPT 5.5 High — 8.5/10\n\nBoth clear and reliable.\n\nGPT 5.5 Low — 8.3/10\n\nHeld up surprisingly well for a lighter prompt.\n\nGPT 5.4 Medium — 8.0/10\n\nGPT 5.4 Low — 7.6/10\n\n**Main takeaway:**\n\nOnce you go all-in on prompt detail (XHigh), the performance gap between 5.4 and 5.5 becomes quite small. This gives you a practical, lower-cost option without losing much quality.", "url": "https://wpnews.pro/news/codex-5-4-vs-5-5-pricing-and-quality", "canonical_source": "https://dev.to/tomerbendavid/codex-54-vs-55-pricing-and-quality-3a1n", "published_at": "2026-06-21 15:00:57+00:00", "updated_at": "2026-06-21 15:34:18.807103+00:00", "lang": "en", "topics": ["large-language-models", "artificial-intelligence", "ai-products", "ai-tools"], "entities": ["GPT 5.4", "GPT 5.5", "ChatGPT"], "alternates": {"html": "https://wpnews.pro/news/codex-5-4-vs-5-5-pricing-and-quality", "markdown": "https://wpnews.pro/news/codex-5-4-vs-5-5-pricing-and-quality.md", "text": "https://wpnews.pro/news/codex-5-4-vs-5-5-pricing-and-quality.txt", "jsonld": "https://wpnews.pro/news/codex-5-4-vs-5-5-pricing-and-quality.jsonld"}}