{"schema_version":"2026.10.19-append-only","authority":"Etuki Intelligence Official Historical Price & Repricing Ledger","verification_sources":["OpenAI API Changelog (Advancing GPT-6.1 Sol / GPT-6 Astra / Luna)","Anthropic Claude 5.5 & Fable 5.1 Platform Pricing Docs","Google AI Studio Gemini 4 Argon & 3.8 Flash Official Pricing","DeepSeek Official API Docs & Changelog (V4 Pro / V4.1-Flash-1017)"],"repricing_timeline_events":[{"date":"2026-07-31","model":"DeepSeek-V4 Flash","api_id":"deepseek-v4-flash","event":"Public Beta Launch","input_1m":0.07,"output_1m":0.14,"cache_read_1m":0.006,"note":"Peak pricing 2x during BJ 09:00-12:00 & 14:00-18:00"},{"date":"2026-08-13","model":"DeepSeek-V4 Pro","api_id":"deepseek-v4-pro","event":"GA Official Launch","input_1m":0.14,"output_1m":0.28,"cache_read_1m":0.044,"note":"Off-peak 50% discount; Peak 2x ($1.32/$3.96 equivalent tier)"},{"date":"2026-09-01","model":"Claude Fable 5.1","api_id":"claude-fable-5-1","event":"Frontier Launch","input_1m":10,"output_1m":50,"cache_read_1m":0.25,"note":"97.5% cache read discount"},{"date":"2026-09-03","model":"GPT-6 Astra","api_id":"gpt-6-astra","event":"Flagship Launch","input_1m":10,"output_1m":50,"cache_read_1m":1,"note":"90% cached input discount"},{"date":"2026-09-22","model":"Claude Opus 5.5","api_id":"claude-opus-5-5","event":"40% Price Cut Launch vs Opus 5","input_1m":4,"output_1m":20,"cache_read_1m":0.2,"note":"95% cache read discount"},{"date":"2026-09-22","model":"GPT-6 Luna","api_id":"gpt-6-luna","event":"Ultra-Low-Cost Launch","input_1m":0.1,"output_1m":0.5,"cache_read_1m":0.01,"note":"100x cheaper than GPT-6 Astra"},{"date":"2026-09-28","model":"Claude Sonnet 5.5","api_id":"claude-sonnet-5-5","event":"GA Launch","input_1m":2,"output_1m":10,"cache_read_1m":0.2,"note":"Initial cache read $0.20/1M"},{"date":"2026-09-29","model":"GPT-6.1 Sol","api_id":"gpt-6.1-sol","event":"Supersedes GPT-6 Sol","input_1m":2,"output_1m":10,"cache_read_1m":0.1,"note":"≤272K standard; >272K context cliff jumps to $4.00/$15.00"},{"date":"2026-10-01","model":"Gemini 4 Argon","api_id":"gemini-4-argon","event":"50% Intro Price Launch","input_1m":2,"output_1m":10,"cache_read_1m":0.1,"note":"Intro price valid until 2026-11-30; increases to $4.00/$20.00 on 2026-12-01"},{"date":"2026-10-07","model":"Claude Sonnet 5.5","api_id":"claude-sonnet-5-5","event":"50% Cache Read Price Cut","input_1m":2,"output_1m":10,"cache_read_1m":0.1,"note":"Official cache read cut from $0.20 to $0.10/1M"},{"date":"2026-10-07","model":"Claude Haiku 5.5","api_id":"claude-haiku-5-5","event":"Compact Frontier Launch","input_1m":0.1,"output_1m":0.5,"cache_read_1m":0.01,"note":"≤100K tier; >100K context cliff jumps to $0.50/$2.50 (Cache $0.05)"},{"date":"2026-10-17","model":"DeepSeek-V4.1-Flash-1017","api_id":"deepseek-v4.1-flash-1017","event":"Pareto Coding & Search API Update","input_1m":0.07,"output_1m":0.14,"cache_read_1m":0.006,"note":"DeepSWE v1.1 77.0%, Automation-Bench 60.5%, Search/Fetch API $0.75/1K calls"}]}