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Calcium-Ion
e9d4d6353c
OpenAI added a 12-hour prompt cache to the Responses API on 2026-10-20 (prompt_cache_options.ttl "12h", GPT-5.6 and later). A 12-hour write costs 2.5x the input price, twice the 30-minute write. We already forwarded the option but billed every cache write at the 30-minute price. - Read cache_write_tokens_details from Responses usage and keep the split through streaming, compaction and format conversion. - Ratio pricing bills 12-hour writes at twice the cache write ratio, the same way Claude 1-hour writes use 6/3.75. - Expressions get a cc12h price. When an expression leaves the long-lived price out, 12-hour writes cost twice the cc price and Claude 1-hour writes 6/3.75 times it; without a cc price they bill as input. Claude cache writes are no longer free when an expression omits cc or cc1h. - gpt-6-astra prices 12-hour writes at $25 ($50 above 272K tokens). - GPT models with a cache write ratio convert to expressions with cc12h. - Chat Completions forwards prompt_cache_options. - The pricing editor, cost estimator, pricing pages and usage log details show the 12-hour price and tokens.