Claude Sonnet 4.6 ships with 1M context window
Same API pricing as 4.5, but 80.2% on SWE-bench (up from 77.2%), 1M token context, and human-level computer use—single string change to migrate.
June 2, 2026
Summary
Existing Sonnet 4.5 deployments gain coding accuracy and long-context reasoning without cost increases. Agentic workflows and document processing unlock materially better performance at parity pricing.
Why it matters
Existing Sonnet 4.5 deployments gain coding accuracy and long-context reasoning without cost increases. Agentic workflows and document processing unlock materially better performance at parity pricing.
Implementation verdict
Replaces Sonnet 4.5 for production agents, coding, and document work. Requires one model string update. Migration is ready now—zero API changes, identical rate limits. Start all new projects on 4.6.
Sources
- 1.Sonnet 4.6 ships with a 1M token context window in beta
- 2.early users are reporting human-level capability on tasks like navigating complex spreadsheets and completing multi-step web forms
- 3.The headline SWE-bench number for 4.6 is 80.2% with a prompt modification, up from 77.2% on 4.5
- 4.the API pricing is identical, and the capability uplift is real
- 5.for existing projects: migrate
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