Claude Opus 5.5

Claude Opus 5.5 has been released. Suitable for long-duration agent-like coding and knowledge work, featuring a 1M-token context window and always-on reasoning. Pricing is $4 per MTok / $20 USD.

• Long-duration coding support
• 1M-token context window
• Always-on reasoning
• Pricing is $4 per MTok / $20 USD