GPT-4.5 preview API Pricing
GPT-4.5 preview is retired; this archive preserves OpenAI's most expensive preview tier. $75/M input, $150/M output, and $37.5/M cached input. The short-lived preview reached $75/M input and $150/M output before OpenAI moved users toward GPT-4.1.
Run the numbers.
Archive calculator pre-loaded with GPT-4.5 preview rates. Tweak spend, output mix, or cache hit rate to compare legacy bills with current replacements.
Real-world presets.
Repo-wide bug fix
Reading 100-page contracts
Support agent ticket triage
Research planning turn
This is a chars-per-token approximation, not a real tokenizer. Actual tokens vary by language, code density, and tool-call overhead — counts are typically ±10–20% off for English prose, more for code or non-Latin scripts. For exact billing, use the vendor's official tokenizer.
| Model | Input /M | Output /M | Effective blended | Context | Best for |
|---|---|---|---|---|---|
| GPT-4.5 preview Current | $75.00 cache $37.50 | $150 | $52.71 agentic 92/8 | 128K | OpenAI archive comparisons |
| GPT-5.5 | $5.00 cache $0.50 | $30.00 | $3.61 −15× | 1M | Current OpenAI flagship |
| GPT-5.4 | $2.50 cache $0.25 | $15.00 | $1.80 −29× | 1.05M | Current OpenAI daily driver |
| GPT-5.4 mini | $0.75 cache $0.075 | $4.50 | $0.541 −97× | 400K | Current cheap OpenAI workloads |
| Claude Sonnet 4.6 | $3.00 cache $0.30 | $15.00 | $2.05 −26× | 1M | Current Claude agents |
| Gemini 3.8 Flash | $0.75 cache $0.075 | $3.75 | $0.481 −110× · promo | 1M | Gemini long-context work |
| DeepSeek V4 Pro | $1.32 cache $0.044 | $3.96 | $0.569 −93× | 1M | Low-cost reasoning and coding |
By replacement
Frequently asked.
Short answers for teams checking GPT-4.5 preview pricing, status, and migration choices.
Q · 01 Is GPT-4.5 preview still available? +
Q · 02 How much did GPT-4.5 preview cost? +
Q · 03 Is cached-input pricing included? +
Q · 04 What replaced it? +
gpt-4-1; use the shelf to compare current options.