[Bug] unexpected status code 400 error when using chat

[sublimesaurabh]

Request failed: Sourcegraph Cody Gateway: unexpected status code 400: {"error":"model "anthropic/claude-2" is not allowed, allowed: [anthropic/claude-2.0, anthropic/claude-instant-v1, anthropic/claude-instant-1, anthropic/claude-instant-1.2]"}