DeepSeek V4 Pro 0423 vs GPT-5.5
API pricing, context window and capabilities for DeepSeek V4 Pro 0423 and GPT-5.5, side by side. Prices are the cheapest serving route per 1M tokens, verified against LiteLLM and OpenRouter.
Verdict
computed from the published numbersDeepSeek V4 Pro 0423 wins on price. GPT-5.5 wins on coding, on intelligence and on context window.
Price
DeepSeek V4 Pro 0423
Coding
GPT-5.5
Intelligence
GPT-5.5
Context window
GPT-5.5
Key takeaways
who wins on what, from the published numbersDeepSeek V4 Pro 0423 wins
- Cheaper input ($0.43 vs $5.00 /1M)
- Cheaper output ($0.87 vs $30.00 /1M)
- Higher max output (512K vs 128K)
- More serving providers (10 vs 3)
GPT-5.5 wins
- Larger context window (1M vs 1.1M)
- Supports vision
- Has web search
Cheaper overall
DeepSeek V4 Pro 0423
$0.43 + $0.87 /1M
Larger context
GPT-5.5
1.1M
More providers
DeepSeek V4 Pro 0423
10 providers
Pricing & specs
cheapest serving route · per 1M tokens| DeepSeek V4 Pro 0423 | GPT-5.5 | |
|---|---|---|
| Input $/1M | $0.43 best | $5.00 |
| Output $/1M | $0.87 best | $30.00 |
| Context window | 1M | 1.1M best |
| Max output | 512K best | 128K |
| Serving providers | 10 best | 3 |
| Released | 2026-04-24 | 2026-04-23 |
Benchmarks
Artificial Analysis indices, side by side| DeepSeek V4 Pro 0423 | GPT-5.5 | |
|---|---|---|
| Intelligence | 53.2 | 56.3 best |
| Coding | 68.8 | 74.9 best |
| GPQA Diamond | 93% | 94% best |
| Output speed | 68 t/s | 81 t/s best |
| Latency (TTFT) | 1.75s best | 80.38s |
Cost calculator
choose a serving route for each sideInput tokens / month
Output tokens / month
DeepSeek V4 Pro 0423
via Tencent
$3.04
GPT-5.5
via Azure
$55
Capabilities
feature support, side by side| Feature | DeepSeek V4 Pro 0423 | GPT-5.5 |
|---|---|---|
| Vision | — | ✓ |
| Tool use | ✓ | ✓ |
| Reasoning | ✓ | ✓ |
| Audio | — | — |
| Prompt caching | ✓ | ✓ |
| Structured output | ✓ | ✓ |
| Web search | — | ✓ |
Related comparisons
Frequently asked questions
Which is cheaper, DeepSeek V4 Pro 0423 or GPT-5.5?
DeepSeek V4 Pro 0423 is cheaper for input ($0.43 vs $5.00 per 1M tokens). DeepSeek V4 Pro 0423 is cheaper for output ($0.87 vs $30.00 per 1M tokens).
What is the context window difference between DeepSeek V4 Pro 0423 and GPT-5.5?
DeepSeek V4 Pro 0423 has a 1M-token context window and GPT-5.5 has 1.1M tokens, so GPT-5.5 can take a larger prompt.
How do DeepSeek V4 Pro 0423 and GPT-5.5 compare on benchmarks?
On the tracked Artificial Analysis indices, GPT-5.5 leads on coding, and GPT-5.5 leads on intelligence.
Pricing verified against LiteLLM + OpenRouter + provider pages · refreshed daily
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