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 listed serving route per 1M tokens, from LiteLLM and OpenRouter.
Verdict
computed from the published numbersDeepSeek V4 Pro 0423 wins on price. GPT-5.5 wins on Terminal-Bench, on intelligence and on context window.
Price
DeepSeek V4 Pro 0423
Terminal-Bench
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 ($0.435 vs $5.00 /1M)
- Cheaper output ($0.87 vs $30.00 /1M)
- Higher max output (1M vs 128K)
- More serving providers (16 vs 6)
GPT-5.5 wins
- Larger context window (1M vs 1.1M)
- Supports vision
- Has web search
Cheaper overall
DeepSeek V4 Pro 0423
$0.435 + $0.87 /1M
Larger context
GPT-5.5
1.1M
More providers
DeepSeek V4 Pro 0423
16 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.
| DeepSeek V4 Pro 0423 | GPT-5.5 | |
|---|---|---|
| Input $/1M | $0.435via Tencent best | $5.00via OpenAI |
| Output $/1M | $0.87via Tencent best | $30.00via OpenAI |
| Context window | 1M | 1.1M best |
| Max output | 1M best | 128K |
| Serving providers | 16 best | 6 |
| Date | Released Apr 24, 2026 | Released Apr 23, 2026 |
Benchmarks
Benchmark scores, side by side| DeepSeek V4 Pro 0423 | GPT-5.5 | |
|---|---|---|
| Intelligence | 30.4 | 38.4 best |
| Terminal-Bench | 65% | 84% best |
| GPQA Diamond | 89% | 94% best |
| Output speed | 100 t/s | 102 t/s best |
| Latency (TTFT) | 1.64s best | 70.60s |
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 OpenAI
$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 ($0.435 vs $5.00 per 1M tokens) from Tencent. DeepSeek V4 Pro 0423 is cheaper for output ($0.87 vs $30.00 per 1M tokens) from Tencent.
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 benchmarks, GPT-5.5 leads on Terminal-Bench, and GPT-5.5 leads on intelligence.
Listed prices from LiteLLM, OpenRouter and Vercel · last checked Oct 14, 2026
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