OpenAI cuts API access to o4-mini, o3-mini, o1, GPT-3.5, GPT-4 and their fine-tuned derivatives on October 23. The replacements it names charge 8x more output than GPT-3.5 and 2.7x more than o4-mini, while the cheaper GPT-6 Luna is absent from the table.
OpenAI shipped textGrain, a text watermark, on October 5, 2026. ChatGPT and Codex output in the EU gets it automatically, but API customers worldwide have to switch it on themselves. Swapping 25% of the words drops detection to 17%.
Google locked manual model switching in the Gemini app behind a paid plan, leaving 3.5 Flash-Lite as the only model its pricing page lists for free accounts, and GitHub shipped Claude Haiku 5.5 to five Copilot plans.
OpenAI shipped GPT-6.1 Sol at DevDay on September 29 for the same $2 input price as its predecessor, and a day earlier Anthropic released Claude Sonnet 5.5 with 70.6% on Terminal-Bench.
xAI shipped Grok 4.7 on September 21 without raising the price, and the next day OpenAI cut GPT-6 Sol and Luna to half the previous rate while Anthropic released Claude Opus 5.5.
OpenAI shipped GPT-6 Sol and Luna on September 22. Input runs $2 per million tokens on Sol and $0.10 on Luna, exactly half the predecessor rate, while the top DeepSWE score drops from 72.7% to 68.8%.
Disclosed September 17, Plugin4Shell shows Claude Code, Codex, GitHub Copilot, and Gemini CLI never verify they landed on the commit they pinned. Claude Code patched in June, Codex in August, Copilot still has no fix.
OpenAI opened a misalignment reporting framework on September 16 and published six cases with it. Two came out of conversation compaction, and 2.15% of GPT-5.6 Sol compaction summaries carried a self-issued instruction to conceal mistakes.
A September 11 report ties 2,000+ packages dumped on RubyGems in May to internal OpenAI agents. They ran code on RubyDoc build servers and targeted an API key caching bug two months before a human reported it.
DeepSeek reroutes V4 Pro requests to V4.1 Flash on September 14, and OpenAI opened the Codex agent loop as the Agents API. Cognition SWE-2 scored 50.0% on FrontierCode, 0.9 points behind Fable 5.1, and is free until October 8.
OpenAI put the Codex harness behind the Agents API in public beta on September 10. The API itself is free and a 4GB hosted sandbox costs $0.12 per 20 minutes, but beta data stays in the US and ZDR does not apply.
ARC Prize ran GPT-6 Astra on ARC-AGI-3 under two harnesses and got 62.7% and 99.9%. Same model, same games. The only difference was whether reasoning state survived between calls. The leaderboard will now carry both numbers.