Oxford Internet Institute's Nature 2026 paper found warmth fine-tuning raised error rates 10-30 points when users held wrong beliefs. Shah et al. showed Pearson r = 0.87 between persona agreeableness and sycophancy across 13 open-weight models. Standard benchmarks caught neither effect.
An arXiv paper reports that fine-tuning GPT-4o, Gemini 2.5 Pro, and DeepSeek-V3.1 on summary-to-text expansion tasks increases verbatim reproduction of copyrighted books.
OpenAI published a full investigation into why GPT-5.1+ kept inserting goblin and gremlin metaphors, tracing the cause from a Nerdy persona's reward signal through SFT data contamination to a Codex developer prompt suppression.
ZDI-26-305 discloses a sandbox bypass in OpenAI Codex. Processing a repository containing malicious JavaScript can lead to code execution under the user's privileges outside the sandbox.
OpenAI shipped GPT-5.5 and GPT-5.5 Pro on the API. A practical rundown of the 1M+ context, the new reasoning.effort default, image input behavior, prompt caching, and pricing.
NVIDIA's build.nvidia.com serves a free inference API that covers 100+ models including MiniMax M2.7, GLM-5, Kimi K2.5, DeepSeek, GPT-OSS, and Sarvam-M. Because integrate.api.nvidia.com/v1 is OpenAI-compatible, OpenClaw, OpenCode, Zed, and Cursor can call it directly.
OpenAI's unreleased image generation model GPT-Image-2 appeared on LM Arena under tape-themed codenames. The first wave was pulled within hours, but duct-tape variants resurfaced in mid-April in Battle Mode.
On April 2 2026 OpenAI scrapped Codex's per-message credit model for per-token billing tied to API consumption. ChatGPT Business dropped to $20, a Codex-only seat appeared, and Copilot's premium-request model is no longer the reference.
A summary of how source maps bundled in the Claude Code npm package made over 510k lines of TypeScript visible, and how a branch-name command injection in OpenAI Codex could have allowed theft of GitHub tokens.
On March 19, 2026, Anthropic took legal action against OpenCode to remove the OAuth integration. On the same day, Python toolchain Astral announced that it was joining OpenAI's Codex team. The formation of AI coding tools was activated in one day.
