AI SignalDaily dispatch - concise, sourced analysis of the day's most important AI and tech news.https://aisignalhq.com/en-usSame List Price, Different Bill: Five Pairs of LLM APIs Where the Workload Decides What You Payhttps://aisignalhq.com/posts/same-list-price-different-bill/https://aisignalhq.com/posts/same-list-price-different-bill/Claude Sonnet 5.5 and GPT-6.1 Sol both list at $2 / $10, yet a long-document workload costs $250 on one and $475 on the other. Five pairs, every assumption shown.Wed, 30 Sep 2026 00:00:00 GMTpricingllm-apiprompt-cachingcomparisonPrompt Caching Is Not 10% Everywhere: What a Cache Hit Costs Across Eight Providershttps://aisignalhq.com/posts/prompt-caching-is-not-10-percent-everywhere/https://aisignalhq.com/posts/prompt-caching-is-not-10-percent-everywhere/49 of the 64 current priced models publish a cache-hit price; four providers charge 10% of input. Anthropic, DeepSeek, xAI, Alibaba and Meta differ, with dates.Wed, 16 Sep 2026 00:00:00 GMTpricingprompt-cachingllm-apiThe Second Price List: What Batch, Flex, Priority and Data-Sharing Discounts Cost Across Seven Providershttps://aisignalhq.com/posts/the-second-price-list/https://aisignalhq.com/posts/the-second-price-list/Half price to wait, double to skip the queue, 12.5× less input to share data: the second price lists of seven LLM providers, read by hand on September 16, 2026.Wed, 16 Sep 2026 00:00:00 GMTpricingbatch-apillm-apimethodologyFive Things Decide What You Pay for a Model, and Only One of Them Is the Modelhttps://aisignalhq.com/posts/five-things-decide-what-you-pay-for-a-model/https://aisignalhq.com/posts/five-things-decide-what-you-pay-for-a-model/Host, time of day, promotions, region and request size move the price of the same model by anything from 1.2× to 10×. Five verified cases, with dates and sources.Tue, 15 Sep 2026 00:00:00 GMTpricingllm-apimethodologyOpenAI's Pricing Page Has Four Tabs That Look the Same in Plain Text. We Published the Wrong One for Seven Days.https://aisignalhq.com/posts/openai-pricing-page-four-tabs-we-published-the-wrong-one-for-seven-days/https://aisignalhq.com/posts/openai-pricing-page-four-tabs-we-published-the-wrong-one-for-seven-days/From September 3 to 11, 2026 this site listed GPT-5.6 Sol, Terra and Luna at half their price, read from the Batch tab. What went wrong, what caught it, and what is still not caught.Tue, 15 Sep 2026 00:00:00 GMTpricingopenaimethodologycorrections