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ClaudeCursorCodex
Showing drops for 2026-09-22Clear date
Tuesday, Sep 22, 2026
4 updates · Claude, Codex▾
Tuesday, Sep 22, 2026
4 updates · Claude, Codex- Claude
Claude Opus 5.5 launch
We just launched Claude Opus 5.5, the first model in our new Claude 5.5 family. It performs at the level of Claude Fable 5.1 on most work and costs 40% less to run than Opus 5. For more information, see our blog post: Introducing Claude Opus 5.5.
- Codex
Better prompt caching for GPT-6
Product
- Codex
Introducing GPT-6 Sol and Luna
Product
- Codex
Priorities and principles for effective third party assessments
Safety