Unverified50% confidenceFactExact time
Bedrock, Vertex, Foundry, and Mantle now use a shorter system prompt for model names that Claude Code cannot recognize; to keep the full prompt, set CLAUDE_CODE_SIMPLE_SYSTEM_PROMPT=0.
1
Sources
50%
Confidence
Medium-term (~90 days)
Relevance
10/27/2026
First Seen
Valid until: 1/25/2027
Sources
Related Entities
Related Claims
UnverifiedClaude Code v2.1.307 fixes an issue where requests failed with a model-not-found error when CLAUDE_CODE_DISABLE_1M_CONTEXT was set and the model was an alias with a [1m] suffix (such as opus[1m]).73% similarUnverifiedClaude Code sends Claude's model names by default and silently calls a smaller model for background work, so the endpoint needs to point the main model, the background small model, and the sonnet and opus aliases all to the same name.70% similarUnverifiedClaude Code内核的最小实现代码量不到30行67% similarUnverifiedAfter mapping Claude Code to a single free model, its capabilities originally tuned for a specific model may be diminished, and performance on complex code tasks needs to be verified by users themselves.65% similar
Cite This Claim
Stable URI
https://kongchang.com/claim/1105252API
curl https://kongchang.com/api/v1/knowledge/claims/1105252MCP
get_claim(id=1105252)