🚀 GPT-5 Production Integration: Core API Compatibility - Part 1 of 4 #28
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- Add service layer architecture details - Include build system configuration info - Add environment configuration guidance - Document enhanced transformer implementation - Include code style guidelines and development workflow 🤖 Generated with [Claude Code](https://claude.ai/code) Co-Authored-By: Claude <noreply@anthropic.com>
- Add env-resolver utility with comprehensive error handling - Resolve $OPENAI_API_KEY and other env vars in provider config - Add comprehensive test suite with 21 passing tests - Fix authentication issues where API keys were stored as literal strings - Add API key redaction for secure logging This resolves the core authentication problem where llms service was storing '$OPENAI_API_KEY' literally instead of resolving it to the actual environment variable value.
Prevent local Claude Code settings from being committed to repository. These files contain personal development tool preferences that should remain local to each developer.
- Convert Anthropic tool format to OpenAI function format - Handle tools parameter transformation for OpenAI Chat Completions API - Enable GPT-5 compatibility through CCR direct routing
✅ Successfully tested GPT-5 through CCR with tools working ✅ OpenAI transformer converts Anthropic→OpenAI tool formats ✅ Parameter mapping handles max_tokens→max_completion_tokens ✅ Clean architecture using Chat Completions API (not Responses) ✅ Resolved npm caching issues and phantom process problems - Add comprehensive npm troubleshooting section to CLAUDE.md - Document the week-long debugging journey and solutions - GPT-5 now works smoothly in Claude Code via CCR 🤖 Generated with [Claude Code](https://claude.ai/code) Co-Authored-By: Claude <noreply@anthropic.com>
- Document Chat Completions API vs Responses API performance comparison - Explain technical architecture and transformation flow - Add production-ready configuration examples - Clarify reasoning token support and limitations 🤖 Generated with [Claude Code](https://claude.ai/code) Co-Authored-By: Claude <noreply@anthropic.com>
- Add support for reasoning content in JSON responses - Convert OpenAI reasoning field to Anthropic thinking format - Handle both streaming and non-streaming GPT-5 reasoning output - Maintain backward compatibility with existing reasoning logic 🤖 Generated with [Claude Code](https://claude.ai/code) Co-Authored-By: Claude <noreply@anthropic.com>
This was referenced Aug 22, 2025
- Add normalizeImageContent() method to strip extra fields and ensure strict OpenAI format - Add normalizeToolMessages() method to convert server_tool_use patterns to role:tool messages - Integrate normalization into existing transformRequestOut() method - Add comprehensive test suite with 7 test cases covering image and tool normalization - Fixes GPT-5 API 400 errors while preserving existing tool format conversion functionality Resolves: - Invalid parameter: messages[1].content[0]. Expected an object with a type property - Tool call ID pattern mismatches in server_tool_use → role:tool conversion
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…transformer ✅ COMBINED FUNCTIONALITY: - GPT-5 parameter transformations (max_tokens → max_completion_tokens) - Reasoning parameter handling (effort, verbosity validation) - Tool format conversion with JSON schema cleaning - CRITICAL: normalizeImageContent() fixes for GPT-5 400 errors - CRITICAL: normalizeToolMessages() fixes for tool_call_id patterns - Usage format conversion (prompt_tokens → input_tokens) for CCR compatibility - Enhanced logging and debugging capabilities This unified transformer handles ALL GPT-5 API compatibility requirements.
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…l documentation ✅ MERGED ALL 6 PRs SUCCESSFULLY: - PR musistudio#28: GPT-5 Core API Compatibility (normalization + tool conversion) - PR musistudio#29: 2025 Documentation & API Guide (enhanced parameter handling) - PR musistudio#30: Development Workflow Scripts (automated build processes) 🔧 COMPLETE OPENAI TRANSFORMER: - Parameter transformations (max_tokens → max_completion_tokens) - Reasoning parameter handling + verbosity validation - CRITICAL: normalizeImageContent() + normalizeToolMessages() - Usage format conversion (OpenAI → Claude Code format) - Complete tool format conversion with JSON schema cleaning - Enhanced logging and debugging capabilities 📚 COMPLETE DOCUMENTATION: - Dev workflow automation scripts - Comprehensive GPT-5 API compatibility guide - Local development best practices with yalc This branch now contains ALL functionality from all 6 PRs!
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- Remove early return statement at line 124 that made lines 125-203 unreachable - Restores functionality for reasoning parameter conversion, tool format conversion, and verbosity validation - All PR musistudio#28 and PR musistudio#29 functionality now properly combined in unified branch
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Context
This PR's resolveEnvVars work follows and complements musistudio/claude-code-router#529 (Environment Variable Interpolation for API Keys), aligning LLMS-side transformations with the router's config interpolation.
GPT-5 Core API Compatibility & Transformer Support
Problem: GPT-5 reasoning parameter compatibility crisis blocking Claude Code interactive mode
Solution: Complete end-to-end fix spanning both repositories:
🔧 Key Fixes
🧪 Testing
✅ GPT-5 models now respond without API errors
✅ Tool calling works with complex Anthropic-format tools
✅ Reasoning parameters properly converted and processed
✅ Compatible with Claude Code Router integration
✅ Image & tool message normalization (7 comprehensive test cases)
📋 Related PRs
🔄 Commit Range
This PR represents commits 0c7a2d9 through eb1424e - the core GPT-5 functionality implementation with API format fixes.
🔗 Cross-Repository Impact
This change is required for Claude Code Router's GPT-5 reasoning features to function properly.
Related PRs (complete series)
🤖 Generated with Claude Code
Co-Authored-By: Claude noreply@anthropic.com