Context Window Calculator
Calculate remaining context space for different LLMs
⚠️
Experimental Tool
This LLM & AI tool is experimental and under active development. Features and accuracy may vary. Use with caution in production environments.
Model Selection
Choose your target LLM model
System Prompt
Instructions for the AI (0 tokens)
Current User Message
Latest user input (0 tokens)
Conversation History
Previous messages (0 tokens)
Context Analysis
Token usage for GPT-4o
Total Input Tokens0
0.00% of context window128,000 max
Token Breakdown
System Prompt0
User Message0
Conversation History0
Remaining Space
Remaining tokens128,000
Max output16,384
Available for response16,384
How to Use
1. Select your target LLM model from the dropdown
2. Enter your system prompt, user message, and conversation history
3. View real-time token usage and remaining context space
4. Ensure sufficient space remains for the AI's response
💡 Tip:
Keep at least 1000-2000 tokens available for meaningful responses. Consider summarizing old conversation history when context is running low.