GPT-4o vs GPT 5.3 Chat
API pricing, context window and capabilities for GPT-4o and GPT 5.3 Chat, side by side. Prices are the cheapest listed serving route per 1M tokens, from LiteLLM and OpenRouter.
Verdict
computed from the published numbersGPT-4o wins on context window. Benchmark data is unavailable for one or both models.
Price
Tied
Terminal-Bench
Not called
Intelligence
Not called
Context window
GPT-4o
Key takeaways
who wins on what, from the published numbersGPT-4o wins
- Cheaper output ($10.00 vs $14.00 /1M)
- Larger context window (131K vs 112K)
- More serving providers (6 vs 2)
- Supports vision
- Supports audio
GPT 5.3 Chat wins
- Cheaper input ($2.50 vs $1.75 /1M)
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-4o | GPT 5.3 Chat | |
|---|---|---|
| Input $/1M | $2.50via OpenAI | $1.75via Azure best |
| Output $/1M | $10.00via OpenAI best | $14.00via Azure |
| Context window | 131K best | 112K |
| Max output | 16K | 16K |
| Serving providers | 6 best | 2 |
| Date | Released May 13, 2024 | First listed Mar 2026 |
Benchmarks
Benchmark scores, side by side| GPT-4o | GPT 5.3 Chat | |
|---|---|---|
| Intelligence | 8.4 | Not available |
| GPQA Diamond | 54% | Not available |
| 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
GPT 5.3 Chat
via OpenRouter
$23
Capabilities
feature support, side by side| Feature | GPT-4o | GPT 5.3 Chat |
|---|---|---|
| Vision | ✓ | — |
| Tool use | ✓ | ✓ |
| Reasoning | — | — |
| Audio | ✓ | — |
| Prompt caching | ✓ | ✓ |
| Structured output | ✓ | ✓ |
| Web search | — | — |
Related comparisons
Frequently asked questions
Which is cheaper, GPT-4o or GPT 5.3 Chat?
GPT 5.3 Chat is cheaper for input ($2.50 vs $1.75 per 1M tokens) from Azure. GPT-4o is cheaper for output ($10.00 vs $14.00 per 1M tokens) from OpenAI.
What is the context window difference between GPT-4o and GPT 5.3 Chat?
GPT-4o has a 131K-token context window and GPT 5.3 Chat has 112K tokens, so GPT-4o can take a larger prompt.
Listed prices from LiteLLM, OpenRouter and Vercel · last checked Oct 14, 2026
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