Claude Opus 4.6 — What’s New Released by Anthropic on 2026-02-05, focused on coding, enterprise agents, and professional workflows. Official links Introducing Claude Opus 4.6: https://www.anthropic.com/news/claude-opus-4-6 Product page: https://www.anthropic.com/claude/opus Key updates Agent Teams The headline feature. You can split work into multiple agents that run in parallel and coordinate directly—no more single-agent, fully-serial workflows. 1M token context (beta) Opus now supports a 1M-token context window (beta) and up to 128K output, aimed at long-running tasks and large codebases....
GPT-5.3-Codex — What’s New
GPT-5.3-Codex — What’s New Released by OpenAI on 2026-02-05 — the same day as Claude Opus 4.6. Official links Introducing GPT-5.3-Codex: https://openai.com/index/introducing-gpt-5-3-codex/ System card: https://openai.com/index/gpt-5-3-codex-system-card/ Key updates A unified model GPT-5.3-Codex combines Codex-grade coding with GPT-style general reasoning. The goal: fewer model switches depending on the task. 25% faster (reported) OpenAI reports a ~25% speedup for Codex users. In agent workflows, small per-turn latency savings add up quickly. “Self-involved” development OpenAI describes this as the first model that participated in parts of its own creation pipeline—debugging training processes, deployment operations, diagnostics, and evaluations....