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GPT-5.4 Studio

A professional-grade AI chat interface for power users who demand control, speed, and multimodal capabilities.

GPT-5.4 Studio is a high-performance chat client built for developers, researchers, and AI enthusiasts who need direct access to cutting-edge language models without compromises. Connect through your own worker endpoint and chat with GPT-5.4, GPT-5.3-codex, o3, o4-mini, and more—complete with full parameter control, streaming responses, and native image support.

Key Features

🎛️ Complete Control
- Fine-tune temperature, topp, topk, frequency/presence penalties, seeds, and max tokens
- Big Context Mode for injecting large reference documents into every conversation
- System prompt customization with model-aware templating

🖼️ Native Multimodal Support
- Drag-and-drop or paste images directly into chat
- Automatic base64 encoding in OpenAI-native format
- Inline image previews with click-to-expand lightbox
- Support for JPEG, PNG, GIF, WebP, and SVG

⚡ Built for Speed
- Real-time streaming with token-per-second metrics
- Auto-resume on timeout (up to 15 automatic retries)
- Payload size monitoring with intelligent trimming
- Context window management to prevent overflow

🔧 Developer-First Design
- Clean, dark-themed UI with monospace typography
- Syntax-highlighted code blocks with one-click copy
- Expandable "thinking" sections for reasoning models
- Export/import full conversation history as JSON
- Console logging for debugging API interactions

📱 Works Everywhere
- Responsive layout optimized for desktop and mobile
- Touch-friendly bottom sheet for settings on small screens
- Keyboard shortcuts (Enter to send, Shift+Enter for newline)

Perfect For

- Software developers iterating with AI coding assistants
- Data scientists running experiments with different parameters
- Content creators generating and refining multimodal content
- AI researchers testing model behavior across configurations
- Power users who outgrew standard chat interfaces

Technical Highlights

- Zero external dependencies for API calls—uses your own worker endpoint
- No API key storage in browser (handled server-side by your worker)
- Local storage for conversation persistence and settings
- Efficient base64 image handling without third-party upload services
- Compatible with any OpenAI-compatible API endpoint