Claude Opus 5.5

Claude Opus 5.5 (22 September 2026) is the first model in Anthropic's Claude 5.5 family and its new lead model for agentic coding, computer use and knowledge work. Anthropic says it performs at the level of Claude Fable 5.1 on most work while costing 40% less to run than Opus 5.

Best for

• Long agentic coding sessions across a whole repository
• Computer use — operating a browser or desktop app end to end
• Knowledge work: research, analysis, documents and spreadsheets
• Teams that were paying Fable 5.1 prices for Fable 5.1 quality

How it compares — and the India angle

• At $4 in / $20 out per million tokens it undercuts Opus 5 ($5/$25) and is less than half of Fable 5.1 and GPT-6 Astra ($10/$50) — and Anthropic's own table has it ahead of Fable 5.1 on Terminal-Bench 4.0 (66.4% vs 55.8%).
• Thinking mode cannot be switched off on Opus 5.5, so every request pays for some reasoning tokens. For short, simple calls Sonnet 5.5 or Haiku 5.5 is the cheaper route.
• Fast mode runs up to 2.5x faster at double the price ($8/$40) — useful for interactive coding, wasteful for overnight batch jobs.
• Indian teams bill in USD: put bulk traffic on Haiku 5.5 and reserve Opus 5.5 for the hard, open-ended work where it earns its price.