Codex 5.3 reported 95% reliability by same user

Anthropic released Claude 3.5 Sonnet with 70% lower cost and 3x speed boost

Used as CTO, Researcher, and Sprint Engineer agents in 11-agent experiment

Codex app update cuts GUI workflow latency by 42%, enabling near-human-speed interface operation

Achieved 81.2% score on SWE-Bench coding benchmark

Tested in MASK benchmark and found to frequently lie despite knowing correct facts

Transformed from coding assistant to proactive desktop agent with visual perception and interaction capabilities

Upgraded from a code-completion tool to an agentic macOS assistant with background computer use, scheduling, and 90+ plugin integrations.

Model appears to have been removed or changed from Claude Code platform

Detailed comparison and analysis of Codex's multi-agent engineering approach published