Expired50% confidenceFactExact time
Anthropic's API keys typically have the prefix sk-ant-.
1
Sources
50%
Confidence
Medium-term (~90 days)
Relevance
7/2/2026
First Seen
This claim has expired. It is kept for the record and no longer describes the current state.
Valid until: 9/30/2026(expired)
Sources
Related Claims
VerifiedAnthropic's API authentication requires setting the x-api-key and anthropic-version fields in the request header.66% similarUnverifiedAPI Key format is typically a long string beginning with sk-ant-, and can be configured for use in clients or IDE plugins such as Claude Code, Cursor, and Continue62% similarUnverifiedAnthropic uses its own API format rather than being compatible with the OpenAI interface standard, which deepens vendor lock-in effects.61% similarUnverifiedModern AI programming tools generally use API keys or OAuth tokens as access credentials, which are attached to the Authorization field of HTTP request headers.57% similarUnverifiedAnthropic uses an explicit cache-marking scheme, OpenAI uses a server-side automatic identification strategy, and DeepSeek achieves fully transparent automatic caching through prefix hash matching.57% similar
Cite This Claim
Stable URI
https://kongchang.com/claim/51178API
curl https://kongchang.com/api/v1/knowledge/claims/51178MCP
get_claim(id=51178)