{"uid":"cap_O_yYhg6YqFLJN9KaeAt6_","slug":"x402-gateway-production-up-railway-app-4f54c067","name":"x402 Gateway – GPT-5.4-Pro (OpenAI Max Reasoning)","description":"OpenAI's max reasoning tier — extended thinking for complex analysis, math, and coding","url":"https://x402-gateway-production.up.railway.app/api/llm/gpt-5.4-pro","method":"POST","headers":{},"bodySchema":null,"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.300000","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"settled","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.300000/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.3","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.3","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_zPZd0tc24hTxt4b3yt4oG","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.3","costPer":"request","priority":0,"asset":null,"unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Calls OpenAI's top-tier GPT-5.4-Pro model with extended thinking for complex analysis, advanced mathematics, and coding tasks via a pay-per-call x402-payment gateway","exampleAgentPrompt":"Use GPT-5.4-Pro's extended reasoning to solve this: given a weighted directed graph with 50 nodes, find the minimum cost path that visits all high-priority nodes at least once and explain the algorithmic approach step by step.","exampleUseCases":null,"resultDescription":"A richly reasoned text response from GPT-5.4-Pro, potentially including chain-of-thought steps, code snippets, mathematical derivations, or structured analysis depending on the prompt — the highest reasoning quality available from OpenAI's lineup.","failureModes":["Insufficient USDC balance or x402 payment failure returns a 402 Payment Required error","Malformed request body or missing prompt returns a 400 Bad Request","Model overload or upstream OpenAI outage returns a 503 Service Unavailable","Request timeout for very long reasoning chains","Rate limiting returns a 429 Too Many Requests"],"whenToPreferThis":"Choose this endpoint when you need OpenAI's highest reasoning capability — complex multi-step math, advanced algorithmic problems, deep code analysis, or nuanced analytical tasks that require extended thinking. Prefer this over lighter-weight models when accuracy and depth of reasoning outweigh cost and latency concerns. If you specifically need the best OpenAI model rather than alternatives like DeepSeek or Mistral, this is the right choice.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-13T18:50:46.042Z","isFirstParty":false}