{"uid":"cap_1aHBjrZuWAQjKp_63EGLJ","slug":"x402engine-claude-opus-5-llm-api-1b65eff8","name":"x402engine Claude Opus 5 LLM API","description":"Anthropic's flagship model with 1M context for coding, analysis, and autonomous work","url":"https://x402engine.app/api/llm/claude-opus-5","method":"POST","headers":{},"bodySchema":null,"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.07","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"registry","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":"$0.07/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.07","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.07","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_6_BTrBsaktdBVn6TPn1aJ","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.07","costPer":"request","priority":0,"asset":null,"unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Calls Anthropic's Claude Opus 5 model with a 1M-token context window for complex coding, analysis, and autonomous agentic tasks via pay-per-call micropayment","exampleAgentPrompt":"Ask Claude Opus 5 to review this 50,000-line Python codebase I've pasted and identify any security vulnerabilities, with max 2048 tokens in the response.","exampleUseCases":[{"title":"Long-document legal contract analysis","prompt":"I have a 200-page legal contract — can you send it to Claude Opus 5 and ask it to summarize the key obligations, risks, and deadlines? Use up to 4096 tokens for the response."},{"title":"Autonomous multi-step coding task","prompt":"Use Claude Opus 5 to write a complete REST API in Python with authentication, database models, and unit tests based on this spec I'm providing — give it 3000 tokens to respond."},{"title":"Complex research synthesis","prompt":"Feed Claude Opus 5 these five research papers I've compiled and have it synthesize the main findings, contradictions, and open questions into a structured report, up to 2048 tokens."}],"resultDescription":"Returns the generated text completion from Claude Opus 5 based on the provided message array, constrained by the max_tokens parameter. The response reflects Claude's full reasoning and generation capability on the given prompt.","failureModes":["Payment not included or insufficient USDC (HTTP 402 returned, request rejected)","Messages array is empty or missing required role/content fields (validation error)","max_tokens exceeds model limits (generation truncated or error returned)","Upstream Anthropic API unavailability causes timeout or 5xx error","Malformed bodyType or method enum causes request rejection"],"whenToPreferThis":"Choose this endpoint when you need Claude Opus 5's top-tier reasoning and 1M-context capability without committing to an Anthropic API subscription — ideal for agents making sporadic, high-value calls. Prefer it over GPT-based alternatives when your task specifically benefits from Claude's coding or long-context strengths, or when you want Anthropic's model accessed via x402 micropayment infrastructure without key management overhead.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-13T18:56:29.733Z","isFirstParty":false}