Claude Opus 5.5 vs DeepSeek Flash
Compare Claude Opus 5.5 vs DeepSeek Flash API pricing, token costs, context windows, and latency. See which model is cheaper and better for your stack.
Claude Opus 5.5 charges $4.00/1M input and $20.00/1M output tokens, compared to DeepSeek Flash at $0.15/1M input and $0.60/1M output. DeepSeek Flash is 26.7x cheaper on input tokens. In reasoning benchmarks, Claude Opus 5.5 holds the higher AA Intelligence Index rating (59/100). For latency-critical streaming, Claude Opus 5.5 delivers 112 t/s (351.0s TTFT) while DeepSeek Flash provides 170 t/s (46.0s TTFT).
Full Metric & Specification Comparison
| Metric | Claude Opus 5.5 | DeepSeek Flash | Advantage |
|---|---|---|---|
| Provider | Anthropic | DeepSeek | - |
| Input Token Cost (1M) | $4.000 | $0.150 | DeepSeek Flash |
| Output Token Cost (1M) | $20.000 | $0.600 | DeepSeek Flash |
| Context Window | 1,000k tokens | 1,000k tokens | Tie |
| AA Intelligence Index | 59/100 | 33/100 | Claude Opus 5.5 |
| Streaming Latency | Fast | Fast | - |
Key Architectural Takeaways
- Input Token Cost: Claude Opus 5.5 is $4.00/1M vs DeepSeek Flash at $0.15/1M
- Output Token Cost: Claude Opus 5.5 is $20.00/1M vs DeepSeek Flash at $0.60/1M
- Context Window: Claude Opus 5.5 supports 1,000k tokens vs DeepSeek Flash with 1,000k tokens
- Benchmark Intelligence Rating: Claude Opus 5.5 scores 59/100 vs DeepSeek Flash at 33/100 (AA Index v5)
- Inference Latency: Claude Opus 5.5 is rated Fast 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 Claude Opus 5.5 saves $203.25/mo ($2439/yr) at this volume.
Frequently Asked Questions
Is Claude Opus 5.5 cheaper than DeepSeek Flash?
DeepSeek Flash is significantly more economical, charging $0.15/1M input compared to $4.00/1M for Claude Opus 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, Claude Opus 5.5 is recommended.
How does context window compare between Claude Opus 5.5 and DeepSeek Flash?
Claude Opus 5.5 offers the larger context window (1,000k tokens), allowing you to pass significantly larger codebases or documents without chunking.
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