Viewing profile — j_filipe

j_filipe

HN member

Building CostLens (https://costlens.dev) — AI cost attribution for engineering teams.

Previously: full-stack engineer working with Next.js, TypeScript, and LLM APIs.

Interested in: developer tools, AI infrastructure, cost optimisation.

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Fri, Jun 12, 2026, 4:38 PM UTC
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Thu, Jun 11, 2026, 5:23 PM UTC
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Claude Fable 5 costs $10/$50M tokens – what that means in production
Thu, Jun 11, 2026, 4:14 PM UTC
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Tue, May 19, 2026, 3:36 PM UTC
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Show HN: AI Efficiency Score – paste any GitHub repo, get a score in seconds
Tue, May 19, 2026, 3:36 PM UTC
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Fri, May 15, 2026, 1:18 PM UTC
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Fri, May 15, 2026, 1:16 PM UTC
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Fri, May 15, 2026, 1:14 PM UTC
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Comment #45951770
Thanks for sharing. I'll take a look!

Mon, Nov 17, 2025, 8:21 AM UTC
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Comment #45945963
Hey everyone! I'm the dev behind this. Started as a weekend project because I kept getting sticker shock from my OpenAI bills. I'd use GPT-4 for literally everything - even "fix th…

Sun, Nov 16, 2025, 3:51 PM UTC
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Show HN: I built CostLens SDK to cut my AI bills by routing to cheaper models
My OpenAI bills were getting out of hand - I was using GPT-4 for everything, even simple tasks that GPT-3.5 could handle perfectly. So I built CostLens. It's a drop-in replacement …

Sun, Nov 16, 2025, 3:47 PM UTC