See how your prompt fills each model's context window. Paste your text and set your expected output to instantly check which models can handle your workload and how much room is left.
Your Prompt / Document 0 words · ~0 tokens
System 500
Input 0
Output 2,000
Total Needed 2,500
GPT-5.3 Codex OpenAI
400K ctx Fits
0.6% used 398K remaining
GPT-4.1 OpenAI
1.0M ctx Fits
0.2% used 1.0M remaining
Claude 4.6 Opus Anthropic
1.0M ctx Fits
0.3% used 998K remaining
Claude 4 Sonnet Anthropic
200K ctx Fits
1.3% used 198K remaining
Gemini 2.5 Pro Google
1.0M ctx Fits
0.3% used 998K remaining
Gemini 2.5 Flash Google
1.0M ctx Fits
0.3% used 998K remaining
DeepSeek R1 DeepSeek
128K ctx Fits
2.0% used 126K remaining
Llama 4 Maverick Meta
1.0M ctx Fits
0.2% used 1.0M remaining