GPT-4 Turbo
cl100k_base
Structural tokenization analysis engine. Optimized for GPT-4 Turbo inputs. Calibrate context windows and compute precise API economics in real-time.
Context
128k
Type
LLM
Encoding
cl 100k base
CH44
WORD9
ENCODINGcl100k_base
// HAPPYTOKENIZER: WAITING FOR INPUT STREAM
Quick Answers
What is the GPT-4 Turbo token limit?
GPT-4 Turbo supports a 128,000 token context window. Paste your text above to see how much of that window your prompt fills.
What tokenizer does GPT-4 Turbo use?
GPT-4 Turbo uses the cl100k_base encoding (GPT-4 / GPT-3.5). This page counts tokens with the vendor's real vocabulary, so the numbers match what the API sees.
How much does GPT-4 Turbo cost per million tokens?
GPT-4 Turbo costs $10.00 per million input tokens and $30.00 per million output tokens, with cached input at $5.00 per million.
Model Insights
Modalities
InText
OutText
Supported Features
StreamingFunction Calling
Supported Endpoints
Chat Completions
Cost Manifest
Input / 1M$10.00
Output / 1M$30.00
Cached Write$5.00
* Rates are estimated based on OpenAI standard tier. Actual billing may vary based on batch processing and enterprise agreements.
// Technical Specifications
- ARCHITECTURE ID
- gpt-4-turbo
- TOKEN ENCODING
- cl100k_base
- MAX CONTEXT
- 128,000TOKENS