Email: OpenAI DevDay and GPT-6.1 Sol ☀️, safety in Muse 🔐, guide to Opus 5.5 📝

Subject:
OpenAI DevDay and GPT-6.1 Sol ☀️, safety in Muse 🔐, guide to Opus 5.5 📝
Received:
9/30/2026, 11:14:31 AM
From:
"TLDR Dev" <dan@tldrnewsletter.com>
To:
silk.theater.56@fwdnl.com
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&lt;div style="display: none; max-height: 0px; overflow: hidden;"&gt;DevDay introduced dots, GPT-6.1 Sol, faster inference, cloud Codex environments, a refreshed CLI, code review, and Codex Security Cloud.&nbsp;‌&nbsp;‌&nbsp;‌&nbsp;‌&nbsp;‌&nbsp;‌&nbsp;‌&nbsp;‌&nbsp;‌&nbsp;‌&nbsp;‌&nbsp;‌&nbsp;‌&nbsp;‌&nbsp;‌&nbsp;‌&nbsp;‌&nbsp;‌&nbsp;‌&nbsp;‌&nbsp;‌&nbsp;‌&nbsp;‌&nbsp;‌&nbsp;‌&nbsp;‌&nbsp;&nbsp;‌&nbsp;‌&nbsp;‌&nbsp;‌&nbsp;‌&nbsp;‌&nbsp;‌&nbsp;‌&nbsp;‌&nbsp;‌&nbsp;‌&nbsp;‌&nbsp;‌&nbsp;‌&nbsp;‌&nbsp;‌&nbsp;‌&nbsp;‌&nbsp;‌&nbsp;‌&nbsp;‌&nbsp;‌&nbsp;‌&nbsp;‌&nbsp;‌&nbsp;‌&nbsp;&lt;/div&gt;
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&lt;h1&gt;&lt;strong&gt;&nbsp;TLDR Dev &lt;span id="date"&gt;2026-09-30&lt;/span&gt;&lt;/strong&gt;&lt;/h1&gt;
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                                        &lt;strong&gt;[Webinar] How to stop babysitting your agents (Sponsor)&lt;/strong&gt;
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&lt;span style="font-family: &quot;Helvetica Neue&quot;, Helvetica, Arial, Verdana, sans-serif;"&gt;
                                    Agents can generate code. Getting it right for your system is the hard part. You end up wasting time and tokens in the correction loops.&nbsp;&lt;p&gt;&lt;/p&gt;&lt;p&gt;More MCPs, rules, and bigger context windows give agents access to information, but not understanding. The teams pulling ahead have a context layer to give agents exactly what they need for the task at hand.&lt;/p&gt;&lt;p&gt;&lt;a href="https://tracking.tldrnewsletter.com/CL0/https:%2F%2Fgetunblocked.com%2Fevents%2Fhow-to-stop-babysitting-your-agents-oct-7%2F%3Futm_source=tldrdev%26utm_medium=email%26utm_campaign=primary_20260930/3/010001a0f205f284-9d62de00-91c6-44df-93b1-6800f6b6bd55-000000/cbaTmVPwwmzop9hQSJdtNdl6ygHl0AkKyID6ConRF30=452" rel="noopener noreferrer nofollow" target="_blank"&gt;&lt;span&gt;Join us live on Oct 7 (FREE) &lt;/span&gt;&lt;/a&gt;to see:&lt;/p&gt;

&lt;ul&gt;
&lt;li&gt;Where teams get stuck on the AI maturity curve and why common fixes fall short&lt;/li&gt;
&lt;li&gt;How a context layer solves for quality, efficiency, and cost&lt;/li&gt;
&lt;li&gt;Live demo: the same task with and without a context layer&lt;/li&gt;
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&lt;div style="text-align: center;"&gt;&lt;span style="font-size: 36px;"&gt;🧑‍💻&lt;/span&gt;&lt;/div&gt;
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&lt;h1&gt;&lt;strong&gt;Articles &amp; Tutorials&lt;/strong&gt;&lt;/h1&gt;
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                                &lt;a href="https://tracking.tldrnewsletter.com/CL0/https:%2F%2Fresearch.meta.ai%2Fblog%2Fsecurity-and-safety-for-ai-agents-our-approach-with-muse%3Futm_source=tldrdev/1/010001a0f205f284-9d62de00-91c6-44df-93b1-6800f6b6bd55-000000/KYDUxrOVPcEEfQ6Cwe0wmUZAGxdQuzwEjJpmUF-J8OA=452"&gt;
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                                        &lt;strong&gt;How We Built Safety Into Muse (20 minute read)&lt;/strong&gt;
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&lt;span style="font-family: &quot;Helvetica Neue&quot;, Helvetica, Arial, Verdana, sans-serif;"&gt;
                                    Muse runs in a dedicated cloud VM where the agent operates inside an isolated runtime cell and never sees real credentials. A separate Sentinel controls connector actions and network egress, while host-side services enforce least privilege, approval scopes, and prompt injection defenses. The design assumes the agent can make mistakes or process hostile data, then limits the damage through layered boundaries and a public bug bounty.
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&lt;span style="font-family: &quot;Helvetica Neue&quot;, Helvetica, Arial, Verdana, sans-serif;"&gt;
                                    A vibe-coded website became more distinctive when the work shifted from asking an agent for a polished result to building design taste and giving specific visual direction. The process shows how coding agents can make implementation cheap while increasing the value of references, critique, typography, and deliberate constraints.
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&lt;div style="text-align: center;"&gt;&lt;span style="font-size: 36px;"&gt;🧠&lt;/span&gt;&lt;/div&gt;
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&lt;h1&gt;&lt;strong&gt;Opinions &amp; Advice&lt;/strong&gt;&lt;/h1&gt;
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                                &lt;a href="https://tracking.tldrnewsletter.com/CL0/https:%2F%2Fclaude.dev%2Fblog%2Fgetting-the-most-out-of-opus-5-5%2F%3Futm_source=tldrdev/1/010001a0f205f284-9d62de00-91c6-44df-93b1-6800f6b6bd55-000000/ZE--PdpY-airK2OKspE5-DqWeUo1D1-3QA9Bo3C00F0=452"&gt;
                                    &lt;span&gt;
                                        &lt;strong&gt;Getting the Most Out of Opus 5.5 (9 minute read)&lt;/strong&gt;
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                                    Give Opus 5.5 a complete task, define what done means, and state when it should stop for input. The model already reasons before every reply, so prompts such as “think carefully” add delay without improving the result. For long coding runs, persistent task files and explicit rules about when to continue help the work survive context compaction and remain steerable.
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                                        &lt;strong&gt;A Staff Engineer's Guide to Inventing Work (9 minute read)&lt;/strong&gt;
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&lt;br&gt;
&lt;br&gt;
&lt;span style="font-family: &quot;Helvetica Neue&quot;, Helvetica, Arial, Verdana, sans-serif;"&gt;
                                    Platform engineers often need to create their own roadmap by reading signals from systems, users, the organization, and the wider industry. Useful inputs include postmortem patterns, cost centers, user workarounds, migration holdouts, repeated leadership concerns, and ideas that have already matured elsewhere. The goal is to combine strong evidence with leading indicators instead of chasing only the loudest recent problem.
                                &lt;/span&gt;
&lt;/span&gt;
&lt;/div&gt;
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&lt;table align="center" border="0" cellpadding="0" cellspacing="0" width="100%"&gt;&lt;tbody&gt;&lt;tr&gt;&lt;td class="container" style="padding: 15px 15px;"&gt;
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&lt;span&gt;
                                &lt;a href="https://tracking.tldrnewsletter.com/CL0/https:%2F%2Fma.ttias.be%2Fdata-is-the-application%2F%3Futm_source=tldrdev/1/010001a0f205f284-9d62de00-91c6-44df-93b1-6800f6b6bd55-000000/u9Hq0HuS46398IRqzC4CLKBpdpcJEkdYIk65AvYY-bw=452"&gt;
                                    &lt;span&gt;
                                        &lt;strong&gt;Data Is the Application (6 minute read)&lt;/strong&gt;
                                    &lt;/span&gt;
&lt;/a&gt;
&lt;br&gt;
&lt;br&gt;
&lt;span style="font-family: &quot;Helvetica Neue&quot;, Helvetica, Arial, Verdana, sans-serif;"&gt;
                                    Agentic coding makes interfaces and features cheap to revise, but user data remains a one-way door that cannot be recreated after a destructive mistake. Schema design, migrations, backups, privacy, and retention therefore deserve slower decisions, explicit recovery plans, and careful validation even when an agent can generate the code in seconds.
                                &lt;/span&gt;
&lt;/span&gt;
&lt;/div&gt;
&lt;/td&gt;&lt;/tr&gt;&lt;/tbody&gt;&lt;/table&gt;

&lt;/td&gt;&lt;/tr&gt;&lt;/tbody&gt;&lt;/table&gt;

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&lt;div class="text-block"&gt;
&lt;div style="text-align: center;"&gt;&lt;span style="font-size: 36px;"&gt;🚀&lt;/span&gt;&lt;/div&gt;&lt;/div&gt;
&lt;/td&gt;&lt;/tr&gt;&lt;/tbody&gt;&lt;/table&gt;

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&lt;div class="text-block"&gt;
&lt;div style="text-align: center;"&gt;

&lt;h1&gt;&lt;strong&gt;Launches &amp; Tools&lt;/strong&gt;&lt;/h1&gt;
&lt;/div&gt;
&lt;/div&gt;
&lt;/td&gt;&lt;/tr&gt;&lt;/tbody&gt;&lt;/table&gt;

&lt;table style="table-layout: fixed; width: 100%;" width="100%"&gt;&lt;tbody&gt;&lt;tr&gt;&lt;td style="padding:0;border-collapse:collapse;border-spacing:0;margin:0;" valign="top"&gt;

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&lt;span&gt;
                                &lt;a href="https://tracking.tldrnewsletter.com/CL0/https:%2F%2Fhubs.la%2FQ04ypbv80/1/010001a0f205f284-9d62de00-91c6-44df-93b1-6800f6b6bd55-000000/g_rmJsfhtJ4OmyXw-D_AeN93K9qlDyHPAdJ0ZCeKk6o=452"&gt;
                                    &lt;span&gt;
                                        &lt;strong&gt;Build Better Models with PyTorch at PyTorch Conference North America (Sponsor)&lt;/strong&gt;
                                    &lt;/span&gt;
&lt;/a&gt;
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&lt;br&gt;
&lt;span style="font-family: &quot;Helvetica Neue&quot;, Helvetica, Arial, Verdana, sans-serif;"&gt;
                                    Go deeper on training, inference, performance optimization, and scaling. Learn directly from the engineers and maintainers advancing PyTorch, vLLM, Ray, and the tools shaping production AI. Join us Oct 20–21 in San Jose and save 25% with code TLDR25.&lt;p&gt;&lt;/p&gt;&lt;p&gt;&lt;a href="https://tracking.tldrnewsletter.com/CL0/https:%2F%2Fhubs.la%2FQ04ypbvW0/1/010001a0f205f284-9d62de00-91c6-44df-93b1-6800f6b6bd55-000000/t0hTg-_wkBa3kpFIJAbe5Ef8kLXe4_-RE7nJbdHNVJs=452" rel="noopener noreferrer nofollow" target="_blank"&gt;&lt;span&gt;Explore the Schedule&lt;/span&gt;&lt;/a&gt; | &lt;a href="https://tracking.tldrnewsletter.com/CL0/https:%2F%2Fhubs.la%2FQ04ypbv80/2/010001a0f205f284-9d62de00-91c6-44df-93b1-6800f6b6bd55-000000/C3VcbsxzrTeI41E_-_Cor91g5MCvcndSMBpqaf0mCuE=452" rel="noopener noreferrer nofollow" target="_blank"&gt;&lt;span&gt;Register + Save 25%&lt;/span&gt;&lt;/a&gt;


&lt;/p&gt;
&lt;/span&gt;&lt;/span&gt;&lt;/div&gt;
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&lt;span&gt;
                                &lt;a href="https://tracking.tldrnewsletter.com/CL0/https:%2F%2Flinks.tldrnewsletter.com%2F3V3hyT/1/010001a0f205f284-9d62de00-91c6-44df-93b1-6800f6b6bd55-000000/k1X33onpDckREu7Dh4rWoKni5gCWRMe2dpEbh1HTo64=452"&gt;
                                    &lt;span&gt;
                                        &lt;strong&gt;GPT-6.1 Sol (Website)&lt;/strong&gt;
                                    &lt;/span&gt;
&lt;/a&gt;
&lt;br&gt;
&lt;br&gt;
&lt;span style="font-family: &quot;Helvetica Neue&quot;, Helvetica, Arial, Verdana, sans-serif;"&gt;
                                    GPT-6.1 Sol targets near-Astra performance on coding, computer use, and professional work at one-fifth of Astra's standard token prices. It improves on GPT-6 Sol by 6.4 percentage points on DeepSWE 1.1 and is priced at $2 per million input tokens and $10 per million output tokens. The model is available in the API, ChatGPT Work, and Codex, with an Ultrafast tier planned.
                                &lt;/span&gt;
&lt;/span&gt;
&lt;/div&gt;
&lt;/td&gt;&lt;/tr&gt;&lt;/tbody&gt;&lt;/table&gt;

&lt;table align="center" border="0" cellpadding="0" cellspacing="0" width="100%"&gt;&lt;tbody&gt;&lt;tr&gt;&lt;td class="container" style="padding: 15px 15px;"&gt;
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&lt;span&gt;
                                &lt;a href="https://tracking.tldrnewsletter.com/CL0/https:%2F%2Flinks.tldrnewsletter.com%2Ff399Ty/1/010001a0f205f284-9d62de00-91c6-44df-93b1-6800f6b6bd55-000000/cqWYUdIKcHapean09i4xyuK7fLA3fA60K6F8PrOHhVY=452"&gt;
                                    &lt;span&gt;
                                        &lt;strong&gt;DevDay 2026 Recap (Website)&lt;/strong&gt;
                                    &lt;/span&gt;
&lt;/a&gt;
&lt;br&gt;
&lt;br&gt;
&lt;span style="font-family: &quot;Helvetica Neue&quot;, Helvetica, Arial, Verdana, sans-serif;"&gt;
                                    DevDay introduced dots, GPT-6.1 Sol, faster inference, cloud Codex environments, a refreshed CLI, code review, and Codex Security Cloud. The developer platform also gained a Decisions API for bounded classifications and an Agents API with computer use, multi-agent orchestration, tool search, and context compaction.
                                &lt;/span&gt;
&lt;/span&gt;
&lt;/div&gt;
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&lt;div style="text-align: center;"&gt;&lt;span style="font-size: 36px;"&gt;🎁&lt;/span&gt;&lt;/div&gt;&lt;/div&gt;
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&lt;div style="text-align: center;"&gt;&lt;strong&gt;&lt;h1&gt;Miscellaneous&lt;/h1&gt;&lt;/strong&gt;&lt;/div&gt;
&lt;/div&gt;
&lt;/td&gt;&lt;/tr&gt;&lt;/tbody&gt;&lt;/table&gt;

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&lt;table align="center" border="0" cellpadding="0" cellspacing="0" width="100%"&gt;&lt;tbody&gt;&lt;tr&gt;&lt;td class="container" style="padding: 15px 15px;"&gt;
&lt;div class="text-block"&gt;
&lt;span&gt;
                                &lt;a href="https://tracking.tldrnewsletter.com/CL0/https:%2F%2Fnewsletter.pragmaticengineer.com%2Fp%2Fthe-pulse-a-new-trend-of-cpu-shortages%3Futm_source=tldrdev/1/010001a0f205f284-9d62de00-91c6-44df-93b1-6800f6b6bd55-000000/lqgjh5j2K2XPvP6y5WYtPUmzcVGPn627ED2xeFNd0Ps=452"&gt;
                                    &lt;span&gt;
                                        &lt;strong&gt;The Pulse: A New Trend of CPU Shortages (8 minute read)&lt;/strong&gt;
                                    &lt;/span&gt;
&lt;/a&gt;
&lt;br&gt;
&lt;br&gt;
&lt;span style="font-family: &quot;Helvetica Neue&quot;, Helvetica, Arial, Verdana, sans-serif;"&gt;
                                    AI agents are increasing demand for general-purpose compute because builds, tests, linters, and other tool calls run continuously on cloud CPUs. Spot discounts have largely disappeared, some reservations now require months of lead time, and server delivery has stretched from weeks to roughly six months. Competition for fabrication capacity and memory supply is also pushing prices higher.
                                &lt;/span&gt;
&lt;/span&gt;
&lt;/div&gt;
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&lt;span&gt;
                                &lt;a href="https://tracking.tldrnewsletter.com/CL0/https:%2F%2Fdreasays.substack.com%2Fp%2Fclaude-55-is-brilliant-confusing%3Futm_source=tldrdev/1/010001a0f205f284-9d62de00-91c6-44df-93b1-6800f6b6bd55-000000/qH27JsJR7ecO_LWDOmSf0b9hsqNZMg5ynTWTvipnD1U=452"&gt;
                                    &lt;span&gt;
                                        &lt;strong&gt;Claude 5.5 Is Brilliant, Confusing, and Very Hungry (11 minute read)&lt;/strong&gt;
                                    &lt;/span&gt;
&lt;/a&gt;
&lt;br&gt;
&lt;br&gt;
&lt;span style="font-family: &quot;Helvetica Neue&quot;, Helvetica, Arial, Verdana, sans-serif;"&gt;
                                    Opus 5.5 leads an independent intelligence index while costing less per token than its predecessor, but Sonnet 5.5 can consume far more output tokens at maximum effort. The practical takeaway is to choose the effort level before choosing the model because it often has a larger effect on speed and total cost, while new cyber safeguards may also redirect or block ordinary work.
                                &lt;/span&gt;
&lt;/span&gt;
&lt;/div&gt;
&lt;/td&gt;&lt;/tr&gt;&lt;/tbody&gt;&lt;/table&gt;

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&lt;div class="text-block"&gt;
&lt;span&gt;
                                &lt;a href="https://tracking.tldrnewsletter.com/CL0/https:%2F%2Fswapniltalekar.substack.com%2Fp%2Fjev-and-the-return-of-the-classifiers%3Futm_source=tldrdev/1/010001a0f205f284-9d62de00-91c6-44df-93b1-6800f6b6bd55-000000/2vJhoQodOJrl2OUxhb-sQwjMqDySStihU6cleOyFPfI=452"&gt;
                                    &lt;span&gt;
                                        &lt;strong&gt;Jev and the Return of the Classifiers (11 minute read)&lt;/strong&gt;
                                    &lt;/span&gt;
&lt;/a&gt;
&lt;br&gt;
&lt;br&gt;
&lt;span style="font-family: &quot;Helvetica Neue&quot;, Helvetica, Arial, Verdana, sans-serif;"&gt;
                                    Jev returns typed choices, scores, or yes-or-no probabilities instead of generating prose, making bounded decisions fast and inexpensive. Its “zero hallucination” claim means outputs always fit the supplied schema, not that every decision is correct. The more important promise is calibrated confidence that can route uncertain cases to humans or slower reasoning models, though that calibration requires validation on real workloads.
                                &lt;/span&gt;
&lt;/span&gt;
&lt;/div&gt;
&lt;/td&gt;&lt;/tr&gt;&lt;/tbody&gt;&lt;/table&gt;

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&lt;div style="text-align: center;"&gt;&lt;span style="font-size: 36px;"&gt;⚡&lt;/span&gt;&lt;/div&gt;&lt;/div&gt;
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&lt;div style="text-align: center;"&gt;

&lt;h1&gt;&lt;strong&gt;Quick Links&lt;/strong&gt;&lt;/h1&gt;
&lt;/div&gt;
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&lt;span&gt;
                                &lt;a href="https://tracking.tldrnewsletter.com/CL0/https:%2F%2Fpages.antithesis.com%2Fwebinar-property-based-testing-tldr%3Futm_medium=Email%26utm_campaign=tldrdev_2026%26utm_source=tldrdev%26utm_content=tldrdev_20260930/1/010001a0f205f284-9d62de00-91c6-44df-93b1-6800f6b6bd55-000000/khMRVajV-4yBMJJ2NW9vpVf24gpItZXVYxU8R3-xH6k=452"&gt;
                                    &lt;span&gt;
                                        &lt;strong&gt;How to use property-based testing to check your app guarantees with 1 test (Sponsor)&lt;/strong&gt;
                                    &lt;/span&gt;
&lt;/a&gt;
&lt;br&gt;
&lt;br&gt;
&lt;span style="font-family: &quot;Helvetica Neue&quot;, Helvetica, Arial, Verdana, sans-serif;"&gt;
                                    Join Antithesis Developer Educator Hillel Wayne to learn how to escape endless “system hardening” with property-based testing. &lt;a href="https://tracking.tldrnewsletter.com/CL0/https:%2F%2Fpages.antithesis.com%2Fwebinar-property-based-testing-tldr%3Futm_medium=Email%26utm_campaign=tldrdev_2026%26utm_source=tldrdev%26utm_content=tldrdev_20260930/2/010001a0f205f284-9d62de00-91c6-44df-93b1-6800f6b6bd55-000000/--yUjYqrpiQJluZy6kNhwuzCpss89iTL7AkfBqP9fUA=452" rel="noopener noreferrer nofollow" target="_blank"&gt;&lt;span&gt;Save your spot for Oct. 29th&lt;/span&gt;&lt;/a&gt;
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&lt;span&gt;
                                &lt;a href="https://tracking.tldrnewsletter.com/CL0/https:%2F%2Flinks.tldrnewsletter.com%2FPYto2P/1/010001a0f205f284-9d62de00-91c6-44df-93b1-6800f6b6bd55-000000/uVye1d4wGdqPRnmW0TW0cejDtDItbIuLM5T6r_p0t1Y=452"&gt;
                                    &lt;span&gt;
                                        &lt;strong&gt;Introducing Dots (Website)&lt;/strong&gt;
                                    &lt;/span&gt;
&lt;/a&gt;
&lt;br&gt;
&lt;br&gt;
&lt;span style="font-family: &quot;Helvetica Neue&quot;, Helvetica, Arial, Verdana, sans-serif;"&gt;
                                    Dots are always-on GPT-6 Astra agents with their own cloud computers, connections to more than 4,000 apps, and access through ChatGPT, Slack, Teams, and voice.
                                &lt;/span&gt;
&lt;/span&gt;
&lt;/div&gt;
&lt;/td&gt;&lt;/tr&gt;&lt;/tbody&gt;&lt;/table&gt;

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&lt;span&gt;
                                &lt;a href="https://tracking.tldrnewsletter.com/CL0/https:%2F%2Fgithub.com%2Fninjahawk%2Flivenerf%3Futm_source=tldrdev/1/010001a0f205f284-9d62de00-91c6-44df-93b1-6800f6b6bd55-000000/s2EgbBv4Y3eYxMfZ9z6Gwom8zLckmIMHPQCaeIPo028=452"&gt;
                                    &lt;span&gt;
                                        &lt;strong&gt;livenerf (GitHub Repo)&lt;/strong&gt;
                                    &lt;/span&gt;
&lt;/a&gt;
&lt;br&gt;
&lt;br&gt;
&lt;span style="font-family: &quot;Helvetica Neue&quot;, Helvetica, Arial, Verdana, sans-serif;"&gt;
                                    livenerf is a preregistered benchmark that runs a pinned Claude Code harness daily to detect post-launch model capability changes while controlling for harness updates and usage shifts.
                                &lt;/span&gt;
&lt;/span&gt;
&lt;/div&gt;
&lt;/td&gt;&lt;/tr&gt;&lt;/tbody&gt;&lt;/table&gt;

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&lt;div class="text-block"&gt;
&lt;span&gt;
                                &lt;a href="https://tracking.tldrnewsletter.com/CL0/https:%2F%2Fearendil.com%2Fposts%2Fyou-said-no-mcp%2F%3Futm_source=tldrdev/1/010001a0f205f284-9d62de00-91c6-44df-93b1-6800f6b6bd55-000000/HMgxl6FkGoQjXqP2bXZnOAR-c4CXOHtPoP16AoA-bic=452"&gt;
                                    &lt;span&gt;
                                        &lt;strong&gt;You Said No MCP! (7 minute read)&lt;/strong&gt;
                                    &lt;/span&gt;
&lt;/a&gt;
&lt;br&gt;
&lt;br&gt;
&lt;span style="font-family: &quot;Helvetica Neue&quot;, Helvetica, Arial, Verdana, sans-serif;"&gt;
                                    Pi now supports MCP in its core because codemode can discover and compose structured MCP tools inside a JavaScript sandbox without flooding the model context.
                                &lt;/span&gt;
&lt;/span&gt;
&lt;/div&gt;
&lt;/td&gt;&lt;/tr&gt;&lt;/tbody&gt;&lt;/table&gt;

&lt;table align="center" border="0" cellpadding="0" cellspacing="0" width="100%"&gt;&lt;tbody&gt;&lt;tr&gt;&lt;td class="container" style="padding: 15px 15px;"&gt;
&lt;div class="text-block"&gt;
&lt;span&gt;
                                &lt;a href="https://tracking.tldrnewsletter.com/CL0/https:%2F%2Fwww.vincentschmalbach.com%2Fhow-to-make-a-database-migration-backward-compatible%2F%3Futm_source=tldrdev/1/010001a0f205f284-9d62de00-91c6-44df-93b1-6800f6b6bd55-000000/7o3a-oZKiZ5OnNpO6ZT4koK3rRHDrcWUc3_Q9ZSD28I=452"&gt;
                                    &lt;span&gt;
                                        &lt;strong&gt;How to Make a Database Migration Backward Compatible (10 minute read)&lt;/strong&gt;
                                    &lt;/span&gt;
&lt;/a&gt;
&lt;br&gt;
&lt;br&gt;
&lt;span style="font-family: &quot;Helvetica Neue&quot;, Helvetica, Arial, Verdana, sans-serif;"&gt;
                                    Safe mixed-version deployments use an expand, migrate, contract sequence with dual-format support, restartable backfills, gradual read cutovers, and evidence that every consumer has stopped using the old schema before cleanup.
                                &lt;/span&gt;
&lt;/span&gt;
&lt;/div&gt;
&lt;/td&gt;&lt;/tr&gt;&lt;/tbody&gt;&lt;/table&gt;

&lt;/td&gt;&lt;/tr&gt;&lt;/tbody&gt;&lt;/table&gt;


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