Phosphor Capital
@phosphorcap
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Phosphor Capital invests in the top founders in each Y Combinator batch. Typical check size is $100k - $500k.
San Francisco
Joined March 2025
Super cool that Anthropic included Vending-Bench 2 in Opus 4.5's system card and blog post. But where is the comparison to Gemini 3 Pro?
Introducing Claude Opus 4.5: the best model in the world for coding, agents, and computer use. Opus 4.5 is a step forward in what AI systems can do, and a preview of larger changes to how work gets done.
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A common thing that happens with some founders during fundraising is treating investors like Pokemon cards โ "gotta catch them all" When you're done, just be done๐
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Today, we're revealing two new evals: Vending-Bench 2 and Vending-Bench Arena. Soon, we expect models to manage entire businesses. This requires Long-term coherence, our key focus here. Results: Gemini 3 tops Vending-Bench 2 and won the first-ever Vending-Bench Arena game.
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Gemini 3 on brand new Vending-Benches!
Today, we're revealing two new evals: Vending-Bench 2 and Vending-Bench Arena. Soon, we expect models to manage entire businesses. This requires Long-term coherence, our key focus here. Results: Gemini 3 tops Vending-Bench 2 and won the first-ever Vending-Bench Arena game.
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โจ blindpay new website is now live โจ in the long run, only developer experience and stablecoin abstraction will be the moat we're getting ready now
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I was lucky enough to bring my family to watch this, the birth of a new industry of data centers in space. Quite moving to see the Falcon rocket light up the whole night sky! Thank you and congrats @PhilipJohnst0n and @Starcloud_Inc1 team!
Iโve never heard a more beautiful call out: โ๐ฆ๐๐ฎ๐ฟ๐ฐ๐น๐ผ๐๐ฑ-๐ญ ๐๐ฒ๐ฝ๐ฎ๐ฟ๐ฎ๐๐ถ๐ผ๐ป ๐ฐ๐ผ๐ป๐ณ๐ถ๐ฟ๐บ๐ฒ๐ฑโ !!!!!! ๐๐๐๐๐๐ @Starcloud_Inc1, @ezrafeilden, @adi__oltean
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every morning, I wake up to something different than most founders. Not a barrage of Slack messages. Not a mountain of tasks. Not a CRM that demands I "log my activities." I wake up to decisions. My CRM has already done the work. While I slept, it: 1. Detected a partnership
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Humans invented software to free ourselves from manual work. Somehow, we still waste billions of hours clicking across websites. Today, @joinkaizen launches to fulfill that original promise. Announcing our $4M raise from @8VC and the public launch of the Kaizen platform.
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Excited to be part of @brexHQ's Zero Day Stack. Delve is now one of 14 tools selected for startups to scale on (alongside OpenAI, Cursor, AWS, and more). For any founder that gets set up with Brex, you'll see Delve among the recommended tools that the most ambitious companies
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Very excited to back @itsCathyDi & @dedaluslabs! Congrats on your $11M raise. What impressed me was: - the number of startups already building on Dedalus, which shows the platform already makes the orchestration of agents much easier and - Cathy's standout charisma and energy,
Dedalus Labs (@dedaluslabs) is building the infrastructure layer for agentic AIโthe simplest way to build and deploy complex agents across any model and any tool. Congrats on the launch, @itsCathyDi & @WindsorNguyen! https://t.co/vxjzXtA6tA
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Most benchmarks test agents on short-horizon reasoning, not real-world, long-running tasks with stateful environments. To solve this, @agenthublabs is launching Benchmarks: one-click testing for your agents on realistic, economically valuable tasks, starting with E-Commerce and
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Ergo, apart of the @ycombinator W25 batch is building the AI layer Salesforce forgot to ship. Every revenue team claims to have a โsingle source of truth. None of them actually trust it. Thatโs the problem @joinergo fixes. The #1 Revenue Automation Infrastructure powering
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Congratulations @reductoai on their $75M Series B, led by @a16z! This is one of the best executions I've seen from a recent @ycombinator startup. @aditabrm & @raunakdoesdev - started incredibly narrow ("understand a PDF") - applied their unique insights to solving this
Iโm thrilled to announce @reductoaiโs $75M Series B led by @a16z, which brings our total funding to $108M. Just five months after our Series A, we've surpassed 1 billion pages processed and grown our monthly volume 6x. We now process hundreds of millions of pages every month for
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Our sales team has been crushing their quotas again and again. We said screw a plain dinner or happy hour. And instead sent them WWE Championship belts that say "Sales champion. 100% compliant, 0% mercy." (PS: WE'RE HIRING)
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Awesome. All 9 of the "most sought after companies" from @ycombinator's Summer 2025 demo day are @phosphorcap companies! Excited to help the next generation of founders build monster companies. @autumnpricing
@dedaluslabs
@designarena_ai Getasap Asia @withkeystone
techcrunch.com
We asked YC-focused investors to name the startups from the Summer 2025 batch that generated the most interest.
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