Verdict
computed from the published numbersGPT-4o wins on price. o3 Pro wins on intelligence and on context window. Benchmark data is unavailable for one or both models.
Price
GPT-4o
Terminal-Bench
Not called
Intelligence
o3 Pro
Context window
o3 Pro
Key takeaways
who wins on what, from the published numbersGPT-4o wins
- Cheaper input ($2.50 vs $20.00 /1M)
- Cheaper output ($10.00 vs $80.00 /1M)
- More serving providers (6 vs 2)
- Supports audio
- Supports prompt caching
o3 Pro wins
- Larger context window (131K vs 200K)
- Higher max output (16K vs 100K)
- Has reasoning mode
- Has web search
Cheaper overall
GPT-4o
$2.50 + $10.00 /1M
Larger context
o3 Pro
200K
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. An OpenRouter routed quote is the price of whichever upstream provider OpenRouter prefers today, so it moves day to day.
| GPT-4o | o3 Pro | |
|---|---|---|
| Input $/1M | $2.50via OpenAI best | $20.00OpenRouter routed quote |
| Output $/1M | $10.00via OpenAI best | $80.00OpenRouter routed quote |
| Context window | 131K | 200K best |
| Max output | 16K | 100K best |
| Serving providers | 6 best | 2 |
| Date | Released May 13, 2024 | Released Jun 10, 2025 |
Benchmarks
Benchmark scores, side by side| GPT-4o | o3 Pro | |
|---|---|---|
| Intelligence | 8.4 | 21.9 best |
| GPQA Diamond | 54% | 85% best |
| Output speed | 150 t/s | Not available |
| Latency (TTFT) | 0.79s | Not available |
Cost calculator
choose a serving route for each sideInput tokens / month
Output tokens / month
GPT-4o
via Gmi
$23
o3 Pro
via OpenRouter
$180
Capabilities
feature support, side by side| Feature | GPT-4o | o3 Pro |
|---|---|---|
| Vision | ✓ | ✓ |
| Tool use | ✓ | ✓ |
| Reasoning | — | ✓ |
| Audio | ✓ | — |
| Prompt caching | ✓ | — |
| Structured output | ✓ | ✓ |
| Web search | — | ✓ |
Related comparisons
Frequently asked questions
Which is cheaper, GPT-4o or o3 Pro?
GPT-4o is cheaper for input ($2.50 vs $20.00 per 1M tokens) from OpenAI. GPT-4o is cheaper for output ($10.00 vs $80.00 per 1M tokens) from OpenAI.
What is the context window difference between GPT-4o and o3 Pro?
GPT-4o has a 131K-token context window and o3 Pro has 200K tokens, so o3 Pro can take a larger prompt.
How do GPT-4o and o3 Pro compare on benchmarks?
On the tracked benchmarks, o3 Pro leads on intelligence.
Listed prices from LiteLLM, OpenRouter and Vercel · last checked Oct 14, 2026
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