Context Length Checker
Check if your prompt fits within the context limits of various AI models. Avoid truncation issues.
Estimated Tokens
0
Model Compatibility
| Provider | Model | Context Limit | Usage | Status |
|---|---|---|---|---|
| OpenAI | GPT-4o | 128K tokens | 0%128,000 left | Fits |
| OpenAI | GPT-4o Mini | 128K tokens | 0%128,000 left | Fits |
| OpenAI | GPT-4 Turbo | 128K tokens | 0%128,000 left | Fits |
| OpenAI | GPT-3.5 Turbo | 16K tokens | 0%16,385 left | Fits |
| OpenAI | o1 Preview | 128K tokens | 0%128,000 left | Fits |
| OpenAI | o1 Mini | 128K tokens | 0%128,000 left | Fits |
| Anthropic | Claude 3.5 Sonnet | 200K tokens | 0%200,000 left | Fits |
| Anthropic | Claude 3 Opus | 200K tokens | 0%200,000 left | Fits |
| Anthropic | Claude 3 Sonnet | 200K tokens | 0%200,000 left | Fits |
| Anthropic | Claude 3 Haiku | 200K tokens | 0%200,000 left | Fits |
| Gemini 1.5 Pro | 2.0M tokens | 0%2,000,000 left | Fits | |
| Gemini 1.5 Flash | 1.0M tokens | 0%1,000,000 left | Fits | |
| Gemini 1.0 Pro | 32K tokens | 0%32,000 left | Fits | |
| Mistral | Mistral Large | 128K tokens | 0%128,000 left | Fits |
| Mistral | Mistral Medium | 32K tokens | 0%32,000 left | Fits |
| Mistral | Mistral Small | 32K tokens | 0%32,000 left | Fits |
| Cohere | Command R+ | 128K tokens | 0%128,000 left | Fits |
| Cohere | Command R | 128K tokens | 0%128,000 left | Fits |
What is Context Length?
Context length (also called context window) is the maximum number of tokens a language model can process in a single request. This includes both your input (prompt) and the model's output. If your content exceeds the context limit, the model may truncate your input or refuse to process it entirely.
Tips to Reduce Context
- •Remove unnecessary whitespace and formatting
- •Summarize long documents before including them
- •Split large tasks into smaller chunks
- •Use models with larger context windows
Frequently Asked Questions
What happens if my prompt is too long?
If your prompt exceeds a model's context limit, different providers handle it differently. Some will truncate your input from the beginning or end, some will return an error, and others may refuse to process the request. It's always best to check your prompt length before sending it to ensure you get the expected results.
Does context length include the AI's response?
Yes, the context limit applies to the total of your input plus the AI's output. If you're near the limit with your input, there may not be room for a complete response. It's good practice to leave at least 10-20% of the context window available for the AI's response.
Which model has the largest context window?
Currently, Google's Gemini 1.5 Pro leads with a 2 million token context window, followed by Gemini 1.5 Flash with 1 million tokens. Anthropic's Claude 3 models offer 200K tokens, and most OpenAI models provide 128K tokens. Always check the latest documentation as these numbers change frequently.
How accurate is the token estimation?
Our token calculator provides estimates based on standard tokenization patterns. While generally accurate within 10-15%, actual token counts may vary depending on the specific model and tokenizer used. For critical applications, we recommend leaving a safety margin of at least 5-10% below the context limit.