fix(ai): update Gemini API model to gemini-1.5-flash-latest

[kaligautier]

Problem

The application was experiencing 404 errors when calling the Gemini API with retry exhaustion:

4xx error from Gemini API: {
  "error": {
    "code": 404,
    "message": "models/gemini-1.5-pro is not found for API version v1beta, 
    or is not supported for generateContent. Call ListModels to see the 
    list of available models and their supported methods.",
    "status": "NOT_FOUND"
  }
}

Root Cause

The model identifier gemini-1.5-pro has been deprecated by Google and is no longer available on the Gemini API v1beta endpoint. The error message confirms the model cannot be found for the generateContent operation.

Solution

Updated the Gemini model configuration from gemini-1.5-pro to gemini-1.5-flash-latest across all configuration files:

Files Changed

• ✅ application.yml - Default configuration
• ✅ application-docker.yml - Docker environment
• ✅ GeminiAIAdapter.java - Default value in constructor

Configuration Update

Before:

ai:
  gemini:
    model: gemini-1.5-pro

After:

ai:
  gemini:
    model: gemini-1.5-flash-latest

Benefits

Aspect	Benefit
Availability	✅ Uses currently available model on Gemini API
Performance	🚀 Gemini 1.5 Flash is optimized for speed
Cost	💰 More cost-effective than Pro model
Stability	🔒 Uses -latest suffix for automatic updates
Compatibility	✅ Maintains same API interface and functionality

Testing

• ✅ Compilation successful
• ✅ No breaking changes to API interface
• ✅ Configuration validated across environments

Additional Context

Gemini 1.5 Flash is Google's recommended model for:

• Fast responses (lower latency)
• High-volume applications
• Cost-sensitive workloads
• Same context window as Pro (up to 1M tokens)

The -latest suffix ensures the application always uses the most recent stable version of the Gemini 1.5 Flash model.

References

• Gemini API Models Documentation
• Error logs showing 404 response from v1beta endpoint

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🤖 Generated with Claude Code

[sonarqubecloud]

Quality Gate failed

Failed conditions
0.0% Coverage on New Code (required ≥ 80%)

See analysis details on SonarQube Cloud