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<div style="display: none; max-height: 0px; overflow: hidden;">OpenAI quietly abandoned the automatic model router, a key feature of its GPT-5, for Free and Go tier users, defaulting them to GPT-5.2 Instant </div>
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<h1><strong>TLDR AI <span id="date">2025-12-17</span></strong></h1>
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<strong>How to stop bots from abusing free trials (Sponsor)</strong>
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Free trials help AI apps grow, but <a class="in-cell-link" href="https://tracking.tldrnewsletter.com/CL0/https:%2F%2Fworkos.com%2Fblog%2Fwhat-is-free-trial-abuse%3Futm_source=tldrai%26utm_medium=newsletter%26utm_campaign=q42025/1/0100019b2ca962aa-d13c252e-7d92-4fb0-8273-08567f1be903-000000/NVwbuKl8orVPy-PFM_fcxB_NayUoWYbAVFNimVFTpCE=436" rel="noopener noreferrer nofollow" target="_blank"><span>bots and fake accounts exploit them</span></a>. They steal tokens, burn compute, and disrupt real users.
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<br>Cursor, the fast-growing AI code assistant, uses <a class="in-cell-link" href="https://tracking.tldrnewsletter.com/CL0/https:%2F%2Fworkos.com%2Fradar%3Futm_source=tldrai%26utm_medium=newsletter%26utm_campaign=q32025/1/0100019b2ca962aa-d13c252e-7d92-4fb0-8273-08567f1be903-000000/G9kfJH2JGcPlVXc74QD5z8NigIRaBJ9X8TF9mJiGrKA=436" rel="noopener noreferrer nofollow" target="_blank"><span>WorkOS Radar</span></a> to detect and stop abuse in real time. With device fingerprinting and behavioral signals, Radar blocks fraud before it reaches your app.
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<strong>GPT-Image-1.5 (9 minute read)</strong>
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OpenAI has launched GPT-Image-1.5, a faster and more accurate image generation model with improved instruction-following and editing. The rollout follows competitive pressure from Google's Gemini 3 and Nano Banana Pro models, which recently led key benchmarks.
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<strong>SAM Audio (3 minute read)</strong>
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Meta has introduced SAM Audio, a new model capable of isolating specific sounds from complex audio using text, visual, or time-based prompts. As part of the Segment Anything family, it brings flexible, prompt-driven sound editing to tasks like removing background noise or isolating instruments in a recording.
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<strong>OpenAI Rolls Back ChatGPT's Model Router System for Most Users (3 minute read)</strong>
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OpenAI quietly abandoned the automatic model router, a key feature of its GPT-5, for Free and Go tier users, defaulting them to GPT-5.2 Instant instead of routing complex queries to reasoning models. The router had increased free users' reasoning model usage from under 1% to 7% but a source says it hurt daily active users because people don't want to wait 20 seconds for a better answer.
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<h1><strong>Deep Dives & Analysis</strong></h1>
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<strong>Inference Economics 101: Reserved Compute versus Inference APIs (20 minute read)</strong>
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The infrastructure layer is no longer converging on a single 'best' model. Instead, it is splitting into two durable and economically attractive markets. One side provides reserved and hourly compute platforms designed to deliver predictability, control, and determinism for customers willing to operate infrastructure directly. The other side operates inference APIs, trading some control for scale while absorbing utilization risk and abstracting complexity in exchange for cost-efficiency and speed. Understanding the split is essential to evaluating where value will accrue as inference becomes ubiquitous.
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<strong>Prompt caching: 10x cheaper LLM tokens, but how? (30 minute read)</strong>
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Catched input tokens are currently 10 times cheaper than regular input tokens for both OpenAI and Anthropic's APIs. They can even reduce latency by up to 85% for long prompts. It is clear that these providers aren't just saving responses and reusing them. This post takes a look at what's actually cached and how prompt caching works in general.
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<strong>Is resumable LLM streaming hard? No, it's just annoying (13 minute read)</strong>
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The state-of-the-art in large language model streaming is surprisingly bad. Both Gemini and Claude require users to refresh the page if their conversation is interrupted mid-stream. This guide shows readers how to implement good, resumable LLM streams. This allows users to refresh tabs mid-stream, switch between chats mid-stream, navigate to other sections of an app without interrupting a stream, and continue streams through momentary internet connection disruptions.
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<strong>Inside Cisco's approach to AI cluster networking — live Jan 28 (Sponsor)</strong>
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<strong>OpenAI Launches Apps SDK With Monetization for ChatGPT (2 minute read)</strong>
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Developers can now build apps that live inside ChatGPT and monetize them through external checkout or, for select partners, Instant Checkout that handles payments without leaving the chat interface.
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<strong>Qwen-Doc for Long-Context Documents (GitHub Repo)</strong>
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Qwen-Doc is an open-source initiative for Document AI, offering models and tools to improve long-context understanding, parsing, and agent-based reasoning for complex documents.
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<strong>Benchmarking AI on Scientific Reasoning (9 minute read)</strong>
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FrontierScience is a benchmark designed to test AI performance on expert-level reasoning tasks in physics, chemistry, and biology.
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