Released with 1M token context and 128k output.

Claude quietly removed full thinking traces feature, according to user reports and researcher Ethan Mollick.

GPT-5.6 Sol scored 72.7% on DeepSWE

Claude Opus 5 released with Fast Mode (2.5x speed) at Opus 4.8 pricing, saving 50% on tokens

Claude Opus 4.8 beats Gemini Pro 5 by 11 points on Fable 5 benchmark

Claude Opus 4.8 achieves 89% task completion and 2.5% harm rate on WorkBench, a dramatic improvement over GPT-4.

Claude Opus 4.8 adds dynamic workflows for agentic coding

Study reveals GPT-5 exhibits central tendency bias in clinical scoring, compressing predictions toward scale midpoint.

Evaluation study published on arXiv assessing its clinical reasoning capabilities

Reportedly became available according to user social media post