[Bug] LLM Hallucination: Persistent Outdated Model Information Bias

Bug Description
Claude is being overly reliant on training data and even when finding evidence that is more up-to-date to it's training data it still reverts back to it's own beliefs. I have tried several time to get up to date information on available ai models to create a knowledge base and almost every time it insists that GBT-5 or Claude 4 do not exist. Even when finding results that prove they exists and can revert back to what it knows. This is a major issue for my knowledge base work as I need to get up to date information on a variety of topics

Environment Info

• Platform: darwin
• Terminal: WarpTerminal
• Version: 1.0.119
• Feedback ID: ee18effc-8080-4fe9-974a-0722a6cd1bb0

Errors

[{"error":"Error: Tool mcp__perplexity-ask__perplexity_ask not found\n    at mCB (file:///Users/patrickmeehan/.claude/local/node_modules/@anthropic-ai/claude-code/cli.js:3032:4391)\n    at QC (file:///Users/patrickmeehan/.claude/local/node_modules/@anthropic-ai/claude-code/cli.js:84:19415)\n    at Yp (file:///Users/patrickmeehan/.claude/local/node_modules/@anthropic-ai/claude-code/cli.js:86:42814)\n    at W9 (file:///Users/patrickmeehan/.claude/local/node_modules/@anthropic-ai/claude-code/cli.js:86:38355)\n    at Vh (file:///Users/patrickmeehan/.claude/local/node_modules/@anthropic-ai/claude-code/cli.js:86:38283)\n    at HC (file:///Users/patrickmeehan/.claude/local/node_modules/@anthropic-ai/claude-code/cli.js:86:38137)\n    at Kz (file:///Users/patrickmeehan/.claude/local/node_modules/@anthropic-ai/claude-code/cli.js:86:35216)\n    at mQ (file:///Users/patrickmeehan/.claude/local/node_modules/@anthropic-ai/claude-code/cli.js:84:4841)\n    at A5 (file:///Users/patrickmeehan/.claude/local/node_modules/@anthropic-ai/claude-code/cli.js:86:32461)\n    at lY (file:///Users/patrickmeehan/.claude/local/node_modules/@anthropic-ai/claude-code/cli.js:84:24920)","timestamp":"2025-09-19T21:24:12.901Z"},{"error":"Error: Language not supported while highlighting code, falling back to markdown: \n    at lV (file:///Users/patrickmeehan/.claude/local/node_modules/@anthropic-ai/claude-code/cli.js:1794:1184)\n    at file:///Users/patrickmeehan/.claude/local/node_modules/@anthropic-ai/claude-code/cli.js:1794:912\n    at Array.map (<anonymous>)\n    at PX (file:///Users/patrickmeehan/.claude/local/node_modules/@anthropic-ai/claude-code/cli.js:1794:903)\n    at dCB (file:///Users/patrickmeehan/.claude/local/node_modules/@anthropic-ai/claude-code/cli.js:3032:9581)\n    at QC (file:///Users/patrickmeehan/.claude/local/node_modules/@anthropic-ai/claude-code/cli.js:84:19415)\n    at Yp (file:///Users/patrickmeehan/.claude/local/node_modules/@anthropic-ai/claude-code/cli.js:86:42814)\n    at W9 (file:///Users/patrickmeehan/.claude/local/node_modules/@anthropic-ai/claude-code/cli.js:86:38355)\n    at Vh (file:///Users/patrickmeehan/.claude/local/node_modules/@anthropic-ai/claude-code/cli.js:86:38283)\n    at HC (file:///Users/patrickmeehan/.claude/local/node_modules/@anthropic-ai/claude-code/cli.js:86:38137)","timestamp":"2025-09-19T21:24:12.912Z"},{"error":"Error: Tool mcp__perplexity-ask__perplexity_ask not found\n    at mCB (file:///Users/patrickmeehan/.claude/local/node_modules/@anthropic-ai/claude-code/cli.js:3032:4391)\n    at QC (file:///Users/patrickmeehan/.claude/local/node_modules/@anthropic-ai/claude-code/cli.js:84:19415)\n    at Yp (file:///Users/patrickmeehan/.claude/local/node_modules/@anthropic-ai/claude-code/cli.js:86:42814)\n    at W9 (file:///Users/patrickmeehan/.claude/local/node_modules/@anthropic-ai/claude-code/cli.js:86:38355)\n    at Vh (file:///Users/patrickmeehan/.claude/local/node_modules/@anthropic-ai/claude-code/cli.js:86:38283)\n    at HC (file:///Users/patrickmeehan/.claude/local/node_modules/@anthropic-ai/claude-code/cli.js:86:38137)\n    at Kz (file:///Users/patrickmeehan/.claude/local/node_modules/@anthropic-ai/claude-code/cli.js:86:35216)\n    at mQ (file:///Users/patrickmeehan/.claude/local/node_modules/@anthropic-ai/claude-code/cli.js:84:4841)\n    at A5 (file:///Users/patrickmeehan/.claude/local/node_modules/@anthropic-ai/claude-code/cli.js:86:32461)\n    at lY (file:///Users/patrickmeehan/.claude/local/node_modules/@anthropic-ai/claude-code/cli.js:84:24920)","timestamp":"2025-09-19T21:24:13.069Z"},{"error":"Error: Language not supported while highlighting code, falling back to markdown: \n    at lV (file:///Users/patrickmeehan/.claude/local/node_modules/@anthropic-ai/claude-code/cli.js:1794:1184)\n    at file:///Users/patrickmeehan/.claude/local/node_modules/@anthropic-ai/claude-code/cli.js:1794:912\n    at Array.map (<anonymous>)\n    at PX (file:///Users/patrickmeehan/.claude/local/node_modules/@anthropic-ai/claude-code/cli.js:1794:903)\n    at dCB (file:///Users/patrickmeehan/.claude/local/node_modules/@anthropic-ai/claude-code/cli.js:3032:9581)\n    at QC (file:///Users/patrickmeehan/.claude/local/node_modules/@anthropic-ai/claude-code/cli.js:84:19415)\n    at Yp (file:///Users/patrickmeehan/.claude/local/node_modules/@anthropic-ai/claude-code/cli

Note: Error logs were truncated.