[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"compare-gpt-53-codex-vs-o3":3},{"modelA":4,"modelB":9,"categories":13,"faq":55,"winsA":68,"winsB":69,"relatedArticles":70,"otherComparisons":71},{"name":5,"provider":6,"pricing":7,"highlights":8},"GPT-5.3-Codex","OpenAI","$1.75\u002F$14","Coding-oriented OpenAI model referenced in June 2026 pricing coverage with strong developer-task performance.",{"name":10,"provider":6,"pricing":11,"highlights":12},"o3","$10\u002F$40","Strongest OpenAI reasoning model",[14,18,24,30,35,40,44,47,51],{"key":15,"label":16,"valueA":6,"valueB":6,"winner":17},"provider","Provider","tie",{"key":19,"label":20,"valueA":21,"valueB":22,"winner":23},"context","Context Window","128K","200K","b",{"key":25,"label":26,"valueA":27,"valueB":28,"winner":29},"pricingInput","Input Price ($\u002F1M)","$1.75","$10","a",{"key":31,"label":32,"valueA":33,"valueB":34,"winner":29},"pricingOutput","Output Price ($\u002F1M)","$14","$40",{"key":36,"label":37,"valueA":38,"valueB":39,"winner":23},"arena","Arena ELO","N\u002FA","1422",{"key":41,"label":42,"valueA":38,"valueB":43,"winner":17},"coding","Coding","unknown",{"key":45,"label":46,"valueA":38,"valueB":43,"winner":17},"reasoning","Reasoning",{"key":48,"label":49,"valueA":38,"valueB":50,"winner":23},"speed","Speed (tokens\u002Fsec)","~30 t\u002Fs",{"key":52,"label":53,"valueA":54,"valueB":54,"winner":17},"openSource","Open Source","No",[56,59,62,65],{"question":57,"answer":58},"Which is cheaper, GPT-5.3-Codex or o3?","GPT-5.3-Codex is approximately 69% cheaper than o3 per million tokens.",{"question":60,"answer":61},"Which is better for coding, GPT-5.3-Codex or o3?","GPT-5.3-Codex scores N\u002FA on coding benchmarks, while o3 scores unknown.",{"question":63,"answer":64},"Which has a larger context window?","GPT-5.3-Codex supports 128K context, while o3 supports 200K.",{"question":66,"answer":67},"Is GPT-5.3-Codex or o3 open source?","GPT-5.3-Codex is proprietary. o3 is proprietary.",2,3,[],[72,77,82,87,92,97,102,107],{"slugA":73,"labelA":74,"slugB":75,"labelB":76},"claude-opus-45-vs-gpt-53-codex","GPT-5.3-Codex vs Claude Opus 4.5","claude-opus-45-vs-o3","o3 vs Claude Opus 4.5",{"slugA":78,"labelA":79,"slugB":80,"labelB":81},"gpt-53-codex-vs-llama-4-scout","GPT-5.3-Codex vs Llama 4 Scout","llama-4-scout-vs-o3","o3 vs Llama 4 Scout",{"slugA":83,"labelA":84,"slugB":85,"labelB":86},"claude-sonnet-46-vs-gpt-53-codex","GPT-5.3-Codex vs Claude Sonnet 4.6","claude-sonnet-46-vs-o3","o3 vs Claude Sonnet 4.6",{"slugA":88,"labelA":89,"slugB":90,"labelB":91},"claude-haiku-45-vs-gpt-53-codex","GPT-5.3-Codex vs Claude Haiku 4.5","claude-haiku-45-vs-o3","o3 vs Claude Haiku 4.5",{"slugA":93,"labelA":94,"slugB":95,"labelB":96},"glm-52-vs-gpt-53-codex","GPT-5.3-Codex vs GLM-5.2","glm-52-vs-o3","o3 vs GLM-5.2",{"slugA":98,"labelA":99,"slugB":100,"labelB":101},"gpt-53-codex-vs-qwen-36","GPT-5.3-Codex vs Qwen 3.6","o3-vs-qwen-36","o3 vs Qwen 3.6",{"slugA":103,"labelA":104,"slugB":105,"labelB":106},"gpt-4o-vs-gpt-53-codex","GPT-5.3-Codex vs GPT-4o","gpt-4o-vs-o3","o3 vs GPT-4o",{"slugA":108,"labelA":109,"slugB":110,"labelB":111},"deepseek-r1-vs-gpt-53-codex","GPT-5.3-Codex vs DeepSeek R1","deepseek-r1-vs-o3","o3 vs DeepSeek R1"]