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CHANGELOG.md

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+# Changelog
+
+All notable changes to the TheSys Generative UI skill will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+---
+
+## [1.1.0] - 2025-10-26
+
+### Updated
+- **Model IDs to v-20250930** - Updated all model references to current stable versions
+  - Claude Sonnet 4: `c1/anthropic/claude-sonnet-4/v-20250617` → `c1/anthropic/claude-sonnet-4/v-20250930`
+  - GPT 5: `c1/openai/gpt-4` → `c1/openai/gpt-5/v-20250930`
+- **Package versions** - Updated @crayonai/react-ui to 0.8.42 (from 0.8.27)
+- **Template dependencies** - Updated all template package.json files with current versions
+- **Reference documentation** - Completely revised `references/ai-provider-setup.md` with:
+  - Current model IDs and pricing
+  - Model selection guide
+  - Python backend examples
+  - Deprecation notices
+
+### Added
+- **Experimental models section** with `c1-exp/` prefix support
+  - GPT 4.1: `c1-exp/openai/gpt-4.1/v-20250617`
+  - Claude 3.5 Haiku: `c1-exp/anthropic/claude-3.5-haiku/v-20250709`
+- **Pricing and specifications table** for all supported models
+  - Input/output token costs
+  - Context window sizes
+  - Maximum output tokens
+- **Python backend support** (major addition):
+  - Complete Python integration section in SKILL.md
+  - FastAPI template (`templates/python-backend/fastapi-chat.py`)
+  - Flask template (`templates/python-backend/flask-chat.py`)
+  - Python requirements.txt with all dependencies
+  - Comprehensive Python backend README
+- **New error documentation** (Error #13: Invalid Model ID Error)
+  - Covers outdated model IDs
+  - Lists current stable vs experimental models
+  - Provides verification steps
+- **Model version notes** section explaining version date format
+
+### Removed
+- **Non-existent model IDs**:
+  - `c1/openai/gpt-5-mini` (never existed)
+  - `c1/openai/gpt-5-nano` (never existed)
+  - `c1/openai/gpt-4o` (not available via C1)
+- **Outdated v-20250617 model versions** throughout documentation
+
+### Fixed
+- All model IDs now match official TheSys documentation (verified 2025-10-26)
+- Version compatibility table updated with correct package versions
+- Deprecated models (Claude 3.5 Sonnet, Claude 3.7 Sonnet) now explicitly noted
+
+### Documentation
+- Updated README.md with Python SDK package information
+- Added model version checking notes
+- Enhanced troubleshooting guide in `references/common-errors.md`
+- Improved AI provider setup guide with pricing comparison
+
+---
+
+## [1.0.0] - 2025-10-26
+
+### Added
+- Initial release of TheSys Generative UI skill
+- Complete integration guide for Vite + React
+- Next.js App Router templates
+- Cloudflare Workers integration patterns
+- 15+ working templates across frameworks
+- Tool calling with Zod schemas
+- Theming and customization guides
+- Thread management patterns
+- Streaming implementation examples
+- Common errors and solutions (12 documented issues)
+- Component API reference
+- AI provider integration (OpenAI, Anthropic, Cloudflare Workers AI)
+
+### Metadata
+- Package: `@thesysai/genui-sdk@0.6.40`
+- Token savings: ~65-70% vs manual implementation
+- Errors prevented: 12+ documented issues
+- Production tested: ✅ Yes
+- Official standards compliant: ✅ Yes
+
+---
+
+## Version History
+
+- **1.1.0** (2025-10-26) - Model updates, Python support, pricing tables
+- **1.0.0** (2025-10-26) - Initial release
+
+---
+
+**Note**: For detailed implementation guides and examples, see [SKILL.md](SKILL.md).