Claude 4 Models Self-Identify as Claude 3.5 Despite Actual Usage

[MarceloRicF]

Before submitting your bug report

• I've tried using the "Ask AI" feature on the Continue docs site to see if the docs have an answer
• I believe this is a bug. I'll try to join the Continue Discord for questions
• I'm not able to find an open issue that reports the same bug
• I've seen the troubleshooting guide on the Continue Docs

Relevant environment info

- OS: Ubuntu 25.04
- Continue version: v1.0.20
- IDE version: VS Code (latest)
- Model: claude-opus-4-1-20250805
- config:
  
  {
    "models": [
      {
        "title": "Claude Opus 4.1 (Latest)",
        "provider": "anthropic", 
        "model": "claude-opus-4-1-20250805",
        "apiKey": "sk-ant-api03-***",
        "capabilities": {
          "tools": true,
          "imageInput": true
        }
      }
    ]
  }

Description

Claude 4 models configured in Continue.dev respond with self-identification as "Claude 3.5 Sonnet" when asked directly, creating user confusion about which model is actually being used. Despite this misidentification, usage data confirms actual Claude 4 token consumption and performance.

To reproduce

1. Configure Continue.dev with Claude 4 model (claude-opus-4-1-20250805)
2. Start a chat session in Continue.dev
3. Ask the model: "Are you Claude 4.1 Opus?"
4. Observe model responds "No" and identifies as Claude 3.5 Sonnet
5. Check Anthropic usage CSV - shows actual Claude 4 token consumption
   Expected: Model should correctly identify as Claude 4.1 Opus Actual: Model claims to be Claude 3.5 Sonnet despite being Claude 4

Log output

No error logs generated. Models function correctly and consume Claude 4 tokens as expected. The issue is purely self-identification discrepancy, not functionality.

Evidence of actual Claude 4 usage:

Anthropic usage CSV shows claude-opus-4-1-20250805 token consumption
Performance tests show Claude 4-level capabilities
Continue.dev Agent mode works as expected