Claude Sonnet 5 launches with a 1M token context window at $2 / $10 per MTok
GAVerifiedAdded Sep 22, 2026
Claude Sonnet 5 supports a 1M token context, 128k max output and the same tools as Sonnet 4.6 except Priority Tier. Migrating teams should note that adaptive thinking is on by default and manual extended thinking changes.
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More Claude Platform releases
Every Claude Platform release| Date | Release | Type |
|---|---|---|
| Jun 30 | Claude Managed Agents session event streams support event deltas Update | Update |
| Jun 30 | Claude Managed Agents session listing adds backward pagination Update | Update |
| Jun 30 | Claude Managed Agents sessions can override agent configuration Update | Update |
| Jun 30 | Claude Managed Agents vaults add injection_location for credentials Update | Update |
| Jun 30 | Claude Managed Agents webhooks cover agent and deployment lifecycle events Update | Update |
| Jul 1 | Access to Claude Fable 5 and Claude Mythos 5 is restored Update | Update |
| Jun 29 | Fast mode removed for Claude Opus 4.6 Deprecation | Deprecation |
| Jul 2 | agent-memory-2026-07-22 beta header changes memory store listing behavior Beta | Beta |
