GPT 4.5 Preview vs GPT-4o
API pricing, context window and capabilities for GPT 4.5 Preview and GPT-4o, side by side. Prices are the cheapest listed serving route per 1M tokens, from LiteLLM and OpenRouter.
Verdict
computed from the published numbersGPT 4.5 Preview wins on intelligence. GPT-4o wins on price and on context window. Benchmark data is unavailable for one or both models.
Price
GPT-4o
Terminal-Bench
Not called
Intelligence
GPT 4.5 Preview
Context window
GPT-4o
Key takeaways
who wins on what, from the published numbersGPT 4.5 Preview wins
No clear edge on the tracked metrics.
GPT-4o wins
- Cheaper input ($75.00 vs $2.50 /1M)
- Cheaper output ($150.00 vs $10.00 /1M)
- Larger context window (128K vs 131K)
- More serving providers (1 vs 6)
- Supports audio
Cheaper overall
GPT-4o
$2.50 + $10.00 /1M
Larger context
GPT-4o
131K
More providers
GPT-4o
6 providers
Pricing & specs
cheapest listed route · per 1M tokensOn-demand listed rates, OpenRouter routed quotes and Vercel reseller quotes. Enterprise commitments can be materially lower.
| GPT 4.5 Preview | GPT-4o | |
|---|---|---|
| Input $/1M | $75.00via Azure | $2.50via OpenAI best |
| Output $/1M | $150.00via Azure | $10.00via OpenAI best |
| Context window | 128K | 131K best |
| Max output | 16K | 16K |
| Serving providers | 1 | 6 best |
| Date | First listed Feb 2025 | Released May 13, 2024 |
Benchmarks
Benchmark scores, side by side| GPT 4.5 Preview | GPT-4o | |
|---|---|---|
| Intelligence | 9.6 best | 8.4 |
| GPQA Diamond | Not available | 54% |
| Output speed | Not available | 150 t/s |
| Latency (TTFT) | Not available | 0.79s |
Cost calculator
choose a serving route for each sideInput tokens / month
Output tokens / month
GPT 4.5 Preview
via Azure
$525
GPT-4o
via Gmi
$23
Capabilities
feature support, side by side| Feature | GPT 4.5 Preview | GPT-4o |
|---|---|---|
| Vision | ✓ | ✓ |
| Tool use | ✓ | ✓ |
| Reasoning | — | — |
| Audio | — | ✓ |
| Prompt caching | ✓ | ✓ |
| Structured output | ✓ | ✓ |
| Web search | — | — |
Related comparisons
Frequently asked questions
Which is cheaper, GPT 4.5 Preview or GPT-4o?
GPT-4o is cheaper for input ($75.00 vs $2.50 per 1M tokens) from OpenAI. GPT-4o is cheaper for output ($150.00 vs $10.00 per 1M tokens) from OpenAI.
What is the context window difference between GPT 4.5 Preview and GPT-4o?
GPT 4.5 Preview has a 128K-token context window and GPT-4o has 131K tokens, so GPT-4o can take a larger prompt.
How do GPT 4.5 Preview and GPT-4o compare on benchmarks?
On the tracked benchmarks, GPT 4.5 Preview leads on intelligence.
Listed prices from LiteLLM, OpenRouter and Vercel · last checked Oct 14, 2026
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