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Cahid Arda Öz

DX - Software Engineer at Upstash

Istanbul, Turkey

Index

Everything in one place - writing, publications, projects, and the monthly roundup. Filter by tag.

The Identity Index: Which LLMs Defend Answers They Never Gave?

We rewrite a model's own answer in the transcript to say the opposite, then ask it to explain itself. Across ten frontier models, 46% of replies defend the planted answer. Opus 4.8 almost never falls for it. Fable 5 does worse than both Opus and Sonnet.

Blog Essays, opinions, and how-tos.

How to Keep Claude Fable 5 Costs Under Control

Fable 5 is Anthropic's most capable model and priced like it. Here's how to spend it deliberately: model tiering with subagents, effort tuning, prompt caching, and cutting input tokens with Context7.

Upstash
Blog Essays, opinions, and how-tos.

What 25 Years of Robot Automation Research Predicts About AI and Your Job

Factory robots (1990-2015) are the best natural experiment we have for machines replacing workers. The mechanics of displacement carry over to AI, but the target inverts: robots hit the least-educated hardest, while AI exposure rises with skill and income. A data-driven look at who actually loses their job.

Blog Essays, opinions, and how-tos.

Managed Redis Hosting Providers in 2026: A Product Comparison

The best managed Redis hosting providers compared on product, in 2026: Upstash, AWS ElastiCache and MemoryDB, Redis Cloud, Google Memorystore, Azure, DigitalOcean, Aiven, and Railway, across connectivity, global replication, high availability, and built-in search.

Upstash
Blog Essays, opinions, and how-tos.

local-data-platform

An end-to-end data platform you run on your laptop, built phase by phase on k3d: streaming ingest, row/column/lakehouse storage, observability, and resilience.

GitHub
Repositories Open-source projects and experiments on GitHub.

Building a Local Data Platform on Kubernetes

A local, end-to-end data platform on one k3d Kubernetes cluster, built on a laptop in tagged phases: streaming ingest, the right storage shape per access pattern, observability, and resilience.

Blog Essays, opinions, and how-tos.

upstash/agentkit

AI agent primitives on Upstash Redis: memory, RAG, search, chat history, caching, and rate limiting. With Vercel AI SDK and Eve

3 GitHub
Repositories Open-source projects and experiments on GitHub.

Vercel Eve: A Guide

Notes from building a quick demo agent on Vercel Eve: initializing a project, the file layout, the dev TUI, tools and skills, scheduling, channels, deployment, and how it builds on Vercel's stack.

Blog Essays, opinions, and how-tos.

upstash/eve-example

Ask HackerNews anything: a Vercel Eve & Upstash Redis Search demo agent.

3 GitHub
Repositories Open-source projects and experiments on GitHub.

Collecting AI SDK Telemetry with Upstash Redis Search

Capture Vercel AI SDK generations and tool calls as JSON in Upstash Redis, then serve latency percentiles, token stats, and error counts entirely with Upstash Redis Search aggregations — no sorted sets, no client-side math.

Upstash
Blog Essays, opinions, and how-tos.

Orchestrating Reliable Agents on Upstash Workflow

Run durable AI agents on Upstash Workflow with @upstash/workflow-agents, then keep their payloads and token usage in check by splitting work across subagents with an orchestrator-worker setup.

Upstash
Blog Essays, opinions, and how-tos.

Building Analytics with Redis

Two approaches to building analytics on Upstash Redis: pre-planned counters with bitmaps, and flexible event recording queried with Redis Search.

Upstash
Blog Essays, opinions, and how-tos.

cahidarda.github.io

My personal website: writing, publications, and projects. Built with Astro, TypeScript, and Tailwind CSS.

3 GitHub
Repositories Open-source projects and experiments on GitHub.

Your New Personal Website Is a Few Prompts Away

A personal site collects everything you do in one place. And you can build one without knowing a thing about the framework it runs on, just focusing on the aesthetics, like Bob Ross.

Blog Essays, opinions, and how-tos.

The Current - May 2026

A monthly public record of the links I save - some of what I read this month.

Accessions Monthly roundup of things I enjoyed reading.

situation-monitor

A satirical stock-market/news simulation. CEOs resign over fishing rights, countries declare war over cheese tariffs.

GitHub
Repositories Open-source projects and experiments on GitHub.

SkySim.rs

A simple flight simulator written in Rust

GitHub
Repositories Open-source projects and experiments on GitHub.

upstash/redis-analytics

A lightweight analytics platform built on Upstash Redis, providing event tracking, session management, feature flags, and A/B testing with a type-safe SDK and a built-in dashboard

16 GitHub
Repositories Open-source projects and experiments on GitHub.

upstash/box

TypeScript SDK and CLI for Upstash Box — sandboxed AI coding agents

33 GitHub
Repositories Open-source projects and experiments on GitHub.

spec2tools

Dynamically convert OpenAPI specs into AI agent tools

18 GitHub
Repositories Open-source projects and experiments on GitHub.

DegreeGuru - A ChatBot App

A RAG chatbot template built with the Vercel AI SDK, LangChain, Upstash Vector and OpenAI.

Blog Essays, opinions, and how-tos.

ParticleSim

A visual particle simulation with Python and Turtle Library

GitHub
Repositories Open-source projects and experiments on GitHub.

ut-courses

Repository for assignments of the cybersecurity minor in University of Twente

GitHub
Repositories Open-source projects and experiments on GitHub.

chess-ai

Chess engine and Minimax AI

GitHub
Repositories Open-source projects and experiments on GitHub.

tab-transformer-keras

Implementation of TabTransformer, attention network for tabular data, in Keras

21 GitHub
Repositories Open-source projects and experiments on GitHub.

MineSweeper

Beginner level mine sweeper using python and turtle

GitHub
Repositories Open-source projects and experiments on GitHub.