GPT-5.3-Codex is here!*Best coding performance (57% SWE-Bench Pro, 76% TerminalBench 2.0, 64% OSWorld).*Mid-task steerability and live updates during tasks.*Faster! Less than half the tokens of 5.2-Codex for same tasks, and >25% faster per token!*Good computer use. ...

Anthropic released Claude Opus 4.5, completing its three-model lineup upgrade with benchmark-topping coding performance and a dramatic 67% price cut. https://t.co/i0pJ9drXEU ...

Model Performance - Claude Haiku 4.5 matches Claude Sonnet 4's coding performance [1] - Claude Haiku 4.5 achieves over 2x the speed of Claude Sonnet 4 [1] - Claude Haiku 4.5 costs one-third of Claude Sonnet 4 [1]