Fast mode removed for Claude Opus 4.6
DeprecationVerifiedAdded Sep 22, 2026
Requests to claude-opus-4-6 with speed fast now run at standard speed and standard rates without erroring, and usage.speed reports the speed used. Migrate to Claude Opus 4.8 to keep fast mode.
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More Claude Platform releases
Every Claude Platform release| Date | Release | Type |
|---|---|---|
| Jun 30 | Claude Sonnet 5 launches with a 1M token context window at $2 / $10 per MTok GA | GA |
| 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 |
| Jul 2 | agent-memory-2026-07-22 beta header changes memory store listing behavior Beta | Beta |
