Context Window Calculator
Paste text to estimate token counts and see how much of each AI model's context window it would consume. Token estimation uses the ~4 characters per token heuristic for English text.
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Context Window Usage
Claude 3.5 Sonnet / Claude 4 Opus
200,000 tokens
0.00% used200,000 tokens remaining
GPT-4o
128,000 tokens
0.00% used128,000 tokens remaining
GPT-4 Turbo
128,000 tokens
0.00% used128,000 tokens remaining
Gemini 1.5 Pro
1,000,000 tokens
0.00% used1,000,000 tokens remaining
Llama 3
128,000 tokens
0.00% used128,000 tokens remaining