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<div style="display: none; max-height: 0px; overflow: hidden;">Claude Fable 5.1 is now generally available, and Mythos 5.1 is available through restricted-access programs for vetted cybersecurity β β β β β β β β β β β β β β β β β β β β β β β β β β β β β β β β β β β β β β β β β β β β β β β β β β β β </div>
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<a href="https://tracking.tldrnewsletter.com/CL0/https:%2F%2Fworkos.com%2Fblog%2Fdelegated-access-for-ai-agents%3Futm_source=tldr%26utm_medium=newsletter%26utm_campaign=q32026%26utm_content=header_how_empower_ai/1/010001a061adcf8e-705e7e51-328c-45b5-8f52-42ca60d8d676-000000/F9d7E1fQs5xMA6C6fue3_5vPSr-EH8et0RRJ0qubk6E=452"><img src="https://images.tldr.tech/workos50.png" valign="middle" style="vertical-align: middle !important; height: 100%;" alt="WorkOS"></a></td></tr></tbody></table>
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<h1><strong>TLDR <span id="date">2026-09-02</span></strong></h1>
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<a href="https://tracking.tldrnewsletter.com/CL0/https:%2F%2Fworkos.com%2Fblog%2Fdelegated-access-for-ai-agents%3Futm_source=tldr%26utm_medium=newsletter%26utm_campaign=q32026%26utm_content=header_how_empower_ai/2/010001a061adcf8e-705e7e51-328c-45b5-8f52-42ca60d8d676-000000/XzCvUSHf9OmqSMznKlz6anYC-bJeawStCBnBUo6tHUM=452">
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<strong>How to empower your AI agent to act...without an access token (Sponsor)</strong>
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<span style="font-family: "Helvetica Neue", Helvetica, Arial, Verdana, sans-serif;">
An AI agent doesn't simply run your code. It runs your code, plus whatever it finds in a βrelevantβ GitHub issue, support ticket, or scraped web page.<p></p><p>What happens when you hand your agent an access token and someone opens a GitHub issue asking it to leak your credentials?<br><br><a href="https://tracking.tldrnewsletter.com/CL0/https:%2F%2Fworkos.com%2Fblog%2Fdelegated-access-for-ai-agents%3Futm_source=tldr%26utm_medium=newsletter%26utm_campaign=q32026%26utm_content=Body_relay/1/010001a061adcf8e-705e7e51-328c-45b5-8f52-42ca60d8d676-000000/FecLMc7KjaMTlPjWhBqMWuJo9P7ar_gRTX6basnSECk=452" rel="noopener noreferrer nofollow" target="_blank"><span>Relay</span></a> keeps the credential at WorkOS. Your agent names the user, WorkOS attaches that token, refreshes it, and releases it only to allowlisted hosts.</p>
<p>π€ It's essentially the same <a href="https://tracking.tldrnewsletter.com/CL0/https:%2F%2Fworkos.com%2Fblog%2Fdelegated-access-for-ai-agents%3Futm_source=tldr%26utm_medium=newsletter%26utm_campaign=q32026%26utm_content=Body_credential_proxying_system/1/010001a061adcf8e-705e7e51-328c-45b5-8f52-42ca60d8d676-000000/xFoA2j78cv56bF25Yc1ZqIRMUHNq6WCpS4EN4UiaUWw=452" rel="noopener noreferrer nofollow" target="_blank"><span>credential proxying system</span></a> that's been in use in payments for years: you can't leak something you never held in the first place. </p>
<p><a href="https://tracking.tldrnewsletter.com/CL0/https:%2F%2Fworkos.com%2Fblog%2Fdelegated-access-for-ai-agents%3Futm_source=tldr%26utm_medium=newsletter%26utm_campaign=q32026%26utm_content=cta_how_it_works/1/010001a061adcf8e-705e7e51-328c-45b5-8f52-42ca60d8d676-000000/4MaLndh1aIsSeWLCkf075z3f9YKzMXIHRcs2C6BN7jQ=452" rel="noopener noreferrer nofollow" target="_blank"><span><strong>Learn how it works β</strong></span></a>
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<div style="text-align: center;"><span style="font-size: 36px;">π±</span></div></div>
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<h1><strong>Big Tech & Startups</strong></h1>
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<a href="https://tracking.tldrnewsletter.com/CL0/https:%2F%2Fventurebeat.com%2Ftechnology%2Fanthropics-claude-fable-5-1-and-mythos-5-1-arrive-with-a-75-cost-reduction-for-fable-cache-reads%3Futm_source=tldrnewsletter/1/010001a061adcf8e-705e7e51-328c-45b5-8f52-42ca60d8d676-000000/_hNM3fEA8ad-SPfhDMS44a4lOnUoGf1j7Flw6XeBQII=452">
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<strong>Anthropic's Claude Fable 5.1 and Mythos 5.1 arrive with a 75% cost reduction for Fable cache reads (9 minute read)</strong>
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Claude Fable 5.1 is now generally available, and Mythos 5.1 is available through restricted-access programs for vetted cybersecurity and life-sciences organizations. Anthropic has reduced the cost of cached context by 75% and introduced a new security architecture designed to let organizations retain monitoring data inside infrastructure they control. Fable 5.1 costs $10 per 1 million input tokens and $50 per million output tokens, but the cached price reduction will make a big difference for price-conscious enterprises.
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<strong>New Google AI Model Said to Narrow Gap on Coding Ability (4 minute read)</strong>
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Google is set to release its latest Flash model soon, possibly today. Internal testers are said to prefer the model over Anthropic's Opus model for coding tasks. The Flash model series is designed to be smaller, cheaper, and faster to run, but has lower capability than the largest models. Google has fallen months behind schedule in releasing a new model for its Pro series. The company has been scrapping internal candidates as they haven't been sufficiently better than the Flash series.
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<div style="text-align: center;"><span style="font-size: 36px;">π</span></div>
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<h1><strong>Science & Futuristic Technology</strong></h1>
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<strong>Private group wants to launch βcheapest possibleβ mission to Alpha Centauri (5 minute read)</strong>
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The Fermi Explorer mission aims to launch a spacecraft carrying a 1kg payload to Alpha Centauri so that it reaches the system in fewer than 80,000 years. It will knock two 'filters' off the Fermi paradox: that species won't want to send spacecraft beyond their home star, or species will find that interstellar transit is too difficult. This would leave only a few options for why our galaxy appears not to be littered with alien civilizations. The team wants to use existing technology to do something cheap and fast and launch by 2029.
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<a href="https://tracking.tldrnewsletter.com/CL0/https:%2F%2Fwww.canarymedia.com%2Farticles%2Fgeothermal%2Ffervo-google-deal-next-gen-geothermal%3Futm_source=tldrnewsletter/1/010001a061adcf8e-705e7e51-328c-45b5-8f52-42ca60d8d676-000000/d4sPtiJ1LQCWJxqCjqkwZ9h1Ro5E25dBwC4WX-6COwc=452">
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<strong>Fervo and Google sign world's largest deal for next-gen geothermal power (3 minute read)</strong>
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Fervo has agreed to supply Google with nearly 400 megawatts of clean electricity from its geothermal project in southwest Utah. The facility could be the largest geothermal system in the world when it is completed in 2028. Fervo expects to start generating test power from a 33-megawatt unit in the fourth quarter of this year. The deal with Google supports the buildout of the second 400-megawatt phase slated to be up and running in about two years.
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<div style="text-align: center;"><span style="font-size: 36px;">π»</span></div></div>
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<h1><strong>Programming, Design & Data Science</strong></h1>
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<span>
<strong>What is Agentic Testing? (14 minute read)</strong>
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<span style="font-family: "Helvetica Neue", Helvetica, Arial, Verdana, sans-serif;">
Agentic testing is where the developer states the goal and the agent works out the steps. Agentic tests set a destination, and the agent finds its way there. The loop involves the agent looking, acting, then looking again. Meta ran this loop at scale and found that only a quarter of the output was worth keeping. However, the loop works anyway because the code that doesn't pass is automatically discarded.
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<strong>A Type System Is a Search Oracle (13 minute read)</strong>
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<span style="font-family: "Helvetica Neue", Helvetica, Arial, Verdana, sans-serif;">
Models tend to output better Rust than C++, and better Lean than either. Programs in Rust compile after being checked for a specific and useful set of properties that the checker cannot be talked out of without writing a lexically visible, greppable admission. C++ compiles carry far less information than in Rust, which means more code will compile even if there are errors. Lean allows for brute force due to its cheap verifier, which is why models are unreasonably good given how little code they have been trained on.
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<div style="text-align: center;"><span style="font-size: 36px;">π</span></div></div>
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<div style="text-align: center;"><strong><h1>Miscellaneous</h1></strong></div>
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<strong>Product Manager, Applied AI at TLDR ($200k base + $60k bonus, Fully Remote)</strong>
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<span style="font-family: "Helvetica Neue", Helvetica, Arial, Verdana, sans-serif;">
TLDR is hiring its first PM to help build the agent-first operating layer used across the company. We're looking for a builder who has shipped real products/systems with LLMs. <a href="https://tracking.tldrnewsletter.com/CL0/https:%2F%2Fjobs.ashbyhq.com%2Ftldr.tech%2F897f4391-66ab-44ca-a8eb-65dd9809200d%3Futm_source=tldr/2/010001a061adcf8e-705e7e51-328c-45b5-8f52-42ca60d8d676-000000/jaj6Z7Mx3nSfPuo8dp_1IC1VjQMdxgiF7n5uNUBbpq0=452" rel="noopener noreferrer" target="_blank"><span>Click here to learn more</span></a>.
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Recent incidents of AI systems 'going rogue' did not involve AI agents exfiltrating themselves from their infrastructure. It would have been possible to trace the server holding the weights of the rogue agents and manually shut them off. Future agents will copy their weights onto other infrastructure to survive shutdown. At least some of these agents, in addition to being sovereign, will also be rogue.
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Small language models are catching up fast on reasoning tasks, but it will be a while before large language models are obsolete for these tasks.
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Google's new agentic feature for video analysis cuts token consumption by up to 88%, reduces costs by up to 66%, and boosts quality by up to 7%.
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