docs/bugs/INVESTIGATION_INVALID_MODELS.md

Bug Investigation: Invalid Default LLM Models

Status

• Date: 2025-11-29
• Reporter: CLI User
• Component: src/utils/config.py
• Priority: High (Magentic Mode Blocker)
• Resolution: FIXED

Issue Description

The user encountered a 403 error when running in Magentic mode: Error code: 403 - {'error': {'message': 'Project ... does not have access to model gpt-5', ... 'code': 'model_not_found'}}

Root Cause Analysis

OpenAI deprecated the base gpt-5 model. Tier 5 accounts now have access to:

• gpt-5.1 (current flagship)
• gpt-5-mini
• gpt-5-nano
• gpt-4.1, gpt-4.1-mini, gpt-4.1-nano
• o3, o4-mini

The base gpt-5 is NO LONGER available via API.

Solution Implemented

Updated src/utils/config.py to use:

• openai_model: gpt-5.1 (the actual current model)
• anthropic_model: claude-sonnet-4-5-20250929 (unchanged)

Verification

• tests/unit/agent_factory/test_judges_factory.py updated and passed.
• User confirmed Tier 5 access to gpt-5.1 via OpenAI dashboard.