GPT-5.5 vs DeepSeek V4 Pro
Compare GPT-5.5 vs DeepSeek V4 Pro API pricing, token costs, context windows, and latency. See which model is cheaper and better for your stack.
GPT-5.5 charges $5.00/1M input and $30.00/1M output tokens, compared to DeepSeek V4 Pro at $0.66/1M input and $1.98/1M output. DeepSeek V4 Pro is 7.6x cheaper on input tokens. In reasoning benchmarks, DeepSeek V4 Pro holds the higher AA Intelligence Index rating. For latency-critical streaming, GPT-5.5 delivers 79 t/s (39.0s TTFT) while DeepSeek V4 Pro provides 80 t/s (59.0s TTFT).
Full Metric & Specification Comparison
| Metric | GPT-5.5 | DeepSeek V4 Pro | Advantage |
|---|---|---|---|
| Provider | OpenAI | DeepSeek | - |
| Input Token Cost (1M) | $5.000 | $0.660 | DeepSeek V4 Pro |
| Output Token Cost (1M) | $30.000 | $1.980 | DeepSeek V4 Pro |
| Context Window | 922k tokens | 1,000k tokens | DeepSeek V4 Pro |
| AA Intelligence Index | Unrated | 23/100 | Unrated |
| Streaming Latency | Moderate | Moderate | - |
Key Architectural Takeaways
- Input Token Cost: GPT-5.5 is $5.00/1M vs DeepSeek V4 Pro at $0.66/1M
- Output Token Cost: GPT-5.5 is $30.00/1M vs DeepSeek V4 Pro at $1.98/1M
- Context Window: GPT-5.5 supports 922k tokens vs DeepSeek V4 Pro with 1,000k tokens
- Benchmark Intelligence Rating: not rated for one or both models
- Inference Latency: GPT-5.5 is rated Moderate vs DeepSeek V4 Pro rated Moderate
Calculate Your Team's Exact Bill Difference
Drag the sliders below to see real-time cost divergences based on your daily token consumption.
Deploying DeepSeek V4 Pro over GPT-5.5 saves $275.25/mo ($3303/yr) at this volume.
Frequently Asked Questions
Is GPT-5.5 cheaper than DeepSeek V4 Pro?
DeepSeek V4 Pro is significantly more economical, charging $0.66/1M input compared to $5.00/1M for GPT-5.5.
Which model should I choose for production?
If your primary constraint is API cost and high query throughput, choose DeepSeek V4 Pro. If you require peak reasoning accuracy and complex tool use, DeepSeek V4 Pro is recommended.
How does context window compare between GPT-5.5 and DeepSeek V4 Pro?
DeepSeek V4 Pro offers the larger context window (1,000k tokens), allowing you to pass significantly larger codebases or documents without chunking.
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