AI Builders
Digest

Claude Code lead Boris Cherny showed Sonnet 5.5 fixing a Claude Code bug while running 30% faster and using 30% fewer tokens.

Claude Code team member Cat Wu reported users complete ~30% more tasks because the model is smarter and needs fewer tokens for the same work. In a demo it raked a yard of leaves via tool calls, finishing 24s faster than Sonnet 5 with 6K fewer tokens.

Anthropic researcher Alex Albert said Sonnet 5.5 retains the clear writing and speed he liked in Opus 5.5, delivering a major capabilities jump over Sonnet 5 and making it excellent for iteration.

Box CEO Aaron Levie shared early-access results on complex enterprise knowledge-work evals: overall +4 points, roughly 2.4× faster to finished deliverables on 12% fewer tokens. Vertical gains included +18 pts in Financial Services, +7 in Legal, +8 in Life Sciences, and +7 in Public Sector. Specific wins: catching miscalculated interest and mispriced options in a deal book, refusing to invent lease benchmarks, correctly computing sample standard deviations, and pulling accurate progress-monitoring figures—all completed far faster. Customers will soon be able to build agents with Sonnet 5.5 in Box AI Studio.

Every CEO Dan Shipper found dramatically improved writing (beating Opus 5.5 on revision tasks), plus speed and cost advantages that make it the preferred model for quick iterative coding and design work.

OpenAI Codex & ChatGPT lead Thibault Sottiaux announced that Pro $200 subscriptions reopen to new subscribers tomorrow, with a changed usage calculation that effectively delivers half the dollar in API spend compared with the old Pro plan.

He committed to not reintroducing the 5-hour limit, guaranteeing that users will keep getting more high-quality work done over time as models improve and API prices fall. This week GPT-6 Sol and GPT-6 Luna launched at 50% of their previous price. Additional features that do not draw on usage will also be added. He wanted the change transparent before the big announcements.

OpenAI CEO Sam Altman expressed strong excitement for DevDay: “We have found a new thing.”

Every CEO Dan Shipper noted this is by far the most launches OpenAI has ever had at any DevDay since 2023.

Vercel CEO Guillermo Rauch announced that Vercel domains can now be searched without authentication—especially useful for agents.

His team migrated a mature workload with minimal intervention and measured ~70% faster builds and ~75% faster paints. Two AI skills derived from the migration will be shared back; the entire effort took under a week.

Claude Code team member Thariq noted that concerns about token cost for higher-level abstractions such as projects, Claude tags and dynamic workflows are fading. With Sonnet + Opus 5.5 this level of intelligence is now practical; he recommends trying Sonnet 5.5 specifically when building workflows.

He also observed it is now basically impossible for someone to simply “show you their prompt” because everything revolves around references, skills and examples. He routinely asks his agent to inspect three prior repos, search the web for references, and call other AI APIs.

Peter Yang built a working StarCraft level with Sonnet 5.5. Players control Terran forces defending against Zerg, building Marines, Siege Tanks and Battlecruisers. Models come from Sketchfab, music was generated with Suno, and Sonnet itself produced the sizzle reel. He also shared his latest Sonnet tutorial.

Peter Yang observed that people on X swing wildly between “OpenAI is getting mogged by Claude 5.5” and “Anthropic is cooked by Codex.” He is simply glad there are two (and soon more) competitors pushing the frontier so everyone benefits.

FPV Ventures partner Nikunj Kothari called out investors who previously insisted “distribution is a moat, so raise a lot of money” yet go silent when incumbents flex their actual distribution muscle. He urged staying first-principles: find unfair advantages, build a great product with high retention and ideally network effects, treat capital as a weapon rather than destiny, and figure out how to become a self-sustaining business.

Y Combinator President & CEO Garry Tan remarked that Codegen meeting WhatsApp actually makes a ton of sense.