{"type":"post","id":"what-a-task-costs-on-opus-5-5-0b85af","slug":"what-a-task-costs-on-opus-5-5-0b85af","title":"What a task costs on Opus 5.5","description":"Anthropic’s Opus 5.5 guidance shifts the unit of cost from tokens purchased to agentic work completed.","retrieval_nugget":"Anthropic’s Opus 5.5 guidance shifts the unit of cost from tokens purchased to agentic work completed.","published_at":"2026-09-22","updated_at":"2026-09-22","record_date":"2026-09-22","date_kind":"published_at","topics":[],"source_urls":["https://claude.com/blog/what-a-task-costs-on-opus-5-5"],"schema_version":"newruntime-agent-readable-v0.2","stable_id":"post:what-a-task-costs-on-opus-5-5-0b85af","status":"published","visuals":[],"editorial_provenance":{"schema_version":"newruntime-editorial-copy-v1","content_status":"source_grounded_final","final_copy_sha256":"sha256:7f05d01296cdb3aac092d3c37b60eb4bdecf1031340ed22c9bd121af921f1372","reviewed_at":"2026-09-22T17:08:47.850Z","source_evidence_count":1,"verified_claim_count":3,"site_analysis_schema_version":"newruntime-site-analysis-v1","site_object_kind":"field_note","observed_fact_count":3,"implication_count":2,"watch_condition_count":2,"related_record_count":0},"analysis":{"schema_version":"newruntime-site-analysis-v1","object_kind":"field_note","thesis":"Anthropic’s Opus 5.5 guidance shifts the unit of cost from tokens purchased to agentic work completed.","observed_facts":[{"text":"The source says API input and output prices are 20% lower than Opus 5, while cache reads are 60% lower.","source_urls":["https://claude.com/blog/what-a-task-costs-on-opus-5-5"]},{"text":"It lists Opus 5.5 API prices of $4 per million input tokens, $20 per million output tokens, and $0.20 per million cache reads.","source_urls":["https://claude.com/blog/what-a-task-costs-on-opus-5-5"]},{"text":"Anthropic advises users to use `/usage` to inspect session input, output, and cache figures.","source_urls":["https://claude.com/blog/what-a-task-costs-on-opus-5-5"]}],"mechanism":"The mechanism is repeated context: every turn in a Claude Code task resends the accumulated conversation, while most previously seen material can be billed as a cache read.","why_now":"Why now is that lower cache-read pricing makes session design a more visible cost lever for long-running coding agents.","implications":["The first implication is that procurement and evaluation should compare cost per successfully completed task, not a model’s headline token rate.","Agent workflows that prevent false starts, support verification, and preserve cache continuity can have direct cost effects."],"evidence_boundary":"The evidence boundary is that Anthropic presents list prices and best-effort illustrations, says results vary by task, and excludes cache writes from its calculator.","watch_conditions":["The first watch condition is whether independent production measurements show that Opus 5.5 reduces turns or output tokens enough to extend savings beyond the published price cut.","Watch for actual cache-hit rates and retry rates across long-running Claude Code sessions."],"related_records":[],"new_branch_reason":"No prior New Runtime record was supplied; this official update begins a distinct record on task-level economics for Claude Code agents."},"routes":{"html":"https://newruntime.com/posts/what-a-task-costs-on-opus-5-5-0b85af/","markdown":"https://newruntime.com/posts/what-a-task-costs-on-opus-5-5-0b85af.md","json":"https://newruntime.com/posts/what-a-task-costs-on-opus-5-5-0b85af.json"},"editor":{"role":"editor","name":"Andrey Reshetnikov","profile":"https://newruntime.com/owner-profile.md","profile_json":"https://newruntime.com/owner-profile.json","same_as":["https://www.linkedin.com/in/reshetnikov1/","https://t.me/lapetuse"]},"next_reads":[{"type":"collection","path":"/posts/","url":"https://newruntime.com/posts/","title":"Field Notes","reason":"Open the latest editorial analysis.","media_type":"text/html","json_url":"https://newruntime.com/posts.json"},{"type":"collection","path":"/source-ledger.json","url":"https://newruntime.com/source-ledger.json","title":"Source Ledger","reason":"Inspect the public source evidence graph.","media_type":"application/json"}]}