GPT-5.5 vs DeepSeek Flash
Compare GPT-5.5 vs DeepSeek Flash 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 Flash at $0.15/1M input and $0.60/1M output. DeepSeek Flash is 33.3x cheaper on input tokens. In reasoning benchmarks, DeepSeek Flash holds the higher AA Intelligence Index rating. For latency-critical streaming, GPT-5.5 delivers 79 t/s (39.0s TTFT) while DeepSeek Flash provides 170 t/s (46.0s TTFT).
Full Metric & Specification Comparison
| Metric | GPT-5.5 | DeepSeek Flash | Advantage |
|---|---|---|---|
| Provider | OpenAI | DeepSeek | - |
| Input Token Cost (1M) | $5.000 | $0.150 | DeepSeek Flash |
| Output Token Cost (1M) | $30.000 | $0.600 | DeepSeek Flash |
| Context Window | 922k tokens | 1,000k tokens | DeepSeek Flash |
| AA Intelligence Index | Unrated | 33/100 | Unrated |
| Streaming Latency | Moderate | Fast | - |
Key Architectural Takeaways
- Input Token Cost: GPT-5.5 is $5.00/1M vs DeepSeek Flash at $0.15/1M
- Output Token Cost: GPT-5.5 is $30.00/1M vs DeepSeek Flash at $0.60/1M
- Context Window: GPT-5.5 supports 922k tokens vs DeepSeek Flash with 1,000k tokens
- Benchmark Intelligence Rating: not rated for one or both models
- Inference Latency: GPT-5.5 is rated Moderate vs DeepSeek Flash rated Fast
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 Flash over GPT-5.5 saves $293.25/mo ($3519/yr) at this volume.
Frequently Asked Questions
Is GPT-5.5 cheaper than DeepSeek Flash?
DeepSeek Flash is significantly more economical, charging $0.15/1M 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 Flash. If you require peak reasoning accuracy and complex tool use, DeepSeek Flash is recommended.
How does context window compare between GPT-5.5 and DeepSeek Flash?
DeepSeek Flash offers the larger context window (1,000k tokens), allowing you to pass significantly larger codebases or documents without chunking.
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