[KongchangAI]
Unverified50% confidenceFactExact time

Opus 5.5 Fast Mode requests no longer require the `fast-mode-2026-02-01` beta header, but requests carrying that header are still compatible.

1
Sources
50%
Confidence
Medium-term (~90 days)
Relevance
10/15/2026
First Seen
Valid until: 1/13/2027

Sources

Opus 5.5 Fast Mode Goes GA: Double the Price and a Caching Trap

Related Entities

Claude Opus 5.5modelFast Modeproduct

Related Claims

UnverifiedOpus 5.5 Fast Mode supports Claude in Microsoft Foundry deployed on Azure, but does not support Anthropic-hosted deployments.61% similar

Cite This Claim

Stable URI
https://kongchang.com/claim/1040919
API
curl https://kongchang.com/api/v1/knowledge/claims/1040919
MCP
get_claim(id=1040919)