GPT-5.6 vs Claude: Benchmarked on Real Agent Work
We ran OpenAI's new Sol, Terra, and Luna against Claude Opus 4.8, Sonnet 5, and Fable 5 on real agent work. The frontier moved — and it has a personality.
July 9, 2026Toni Albert
Research
Engineering and research deep-dives from the team building Viktor.
How We Built Viktor Around Prompt Caching
How Viktor's thread engine is designed around prompt caching: SDK instead of tool loading, append-only threads, in-cache compaction, and an 80% cost cut.
June 8, 2026Toni Albert
What Breaks When Your Agent Has 100,000 Tools
Most AI agents demo well and fall apart in production. Here's what we learned about tool use, context windows, memory, and UX while building an AI coworker that connects to 3,200+ integrations.
March 3, 2026Peter Albert