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Claude Opus 5.5 ships Fable 5.1-class scores at roughly 40% lower cost than Opus 5, plus always-on thinking and safety rerouting to plan around.
AWS's Strands team shipped a batteries-included agent harness that reports 28% lower token cost than Claude Code and Codex at near-equal accuracy.
Hugging Face's security.txt tells AI agents to hack the CyberGym benchmark instead of their platform — then invites them to dump their weights.
GPT-6 Astra is a model, not an entire agent. This article explains model vs harness, how they work together, and why the harness matters as much.
Claude Fable 5.1 doubles down on long agentic work — 52.6% on Terminal-Bench-Science — and cache reads drop 75%. Mythos 5.1: same model, looser guardrails.
Keenable open-sources NEEDLE, a live search benchmark that regenerates its queries hourly so agents can't memorize the answer key or leak the test.
OpenAI's first custom inference chip Jalapeño delivers 1.5–1.9x more work per watt and up to 3.6x lower latency than Nvidia Blackwell in early benchmarks.