Claude Opus 5.5 vs Claude Sonnet 5.5
Compare Claude Opus 5.5 vs Claude Sonnet 5.5 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 Claude Sonnet 5.5 at $2.00/1M input and $10.00/1M output. Claude Sonnet 5.5 is 2.0x 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 Claude Sonnet 5.5 provides 156 t/s (247.0s TTFT).
Full Metric & Specification Comparison
| Metric | Claude Opus 5.5 | Claude Sonnet 5.5 | Advantage |
|---|---|---|---|
| Provider | Anthropic | Anthropic | - |
| Input Token Cost (1M) | $4.000 | $2.000 | Claude Sonnet 5.5 |
| Output Token Cost (1M) | $20.000 | $10.000 | Claude Sonnet 5.5 |
| Context Window | 1,000k tokens | 1,000k tokens | Tie |
| AA Intelligence Index | 59/100 | 55/100 | Claude Opus 5.5 |
| Streaming Latency | Fast | Fast | - |
Key Architectural Takeaways
- Input Token Cost: Claude Opus 5.5 is $4.00/1M vs Claude Sonnet 5.5 at $2.00/1M
- Output Token Cost: Claude Opus 5.5 is $20.00/1M vs Claude Sonnet 5.5 at $10.00/1M
- Context Window: Claude Opus 5.5 supports 1,000k tokens vs Claude Sonnet 5.5 with 1,000k tokens
- Benchmark Intelligence Rating: Claude Opus 5.5 scores 59/100 vs Claude Sonnet 5.5 at 55/100 (AA Index v5)
- Inference Latency: Claude Opus 5.5 is rated Fast vs Claude Sonnet 5.5 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 Claude Sonnet 5.5 over Claude Opus 5.5 saves $105.00/mo ($1260/yr) at this volume.
Frequently Asked Questions
Is Claude Opus 5.5 cheaper than Claude Sonnet 5.5?
Claude Sonnet 5.5 is significantly more economical, charging $2.00/1M 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 Claude Sonnet 5.5. 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 Claude Sonnet 5.5?
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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