Claude Sonnet 5.5 vs Gemini 3.8 Flash
Compare Claude Sonnet 5.5 vs Gemini 3.8 Flash API pricing, token costs, context windows, and latency. See which model is cheaper and better for your stack.
Claude Sonnet 5.5 charges $2.00/1M input and $10.00/1M output tokens, compared to Gemini 3.8 Flash at $0.75/1M input and $3.75/1M output. Gemini 3.8 Flash is 2.7x cheaper on input tokens. In reasoning benchmarks, Claude Sonnet 5.5 holds the higher AA Intelligence Index rating (55/100). For latency-critical streaming, Claude Sonnet 5.5 delivers 156 t/s (247.0s TTFT) while Gemini 3.8 Flash provides 113 t/s (20.0s TTFT).
Full Metric & Specification Comparison
| Metric | Claude Sonnet 5.5 | Gemini 3.8 Flash | Advantage |
|---|---|---|---|
| Provider | Anthropic | - | |
| Input Token Cost (1M) | $2.000 | $0.750 | Gemini 3.8 Flash |
| Output Token Cost (1M) | $10.000 | $3.750 | Gemini 3.8 Flash |
| Context Window | 1,000k tokens | 1,000k tokens | Tie |
| AA Intelligence Index | 55/100 | 31/100 | Claude Sonnet 5.5 |
| Streaming Latency | Fast | Fast | - |
Key Architectural Takeaways
- Input Token Cost: Claude Sonnet 5.5 is $2.00/1M vs Gemini 3.8 Flash at $0.75/1M
- Output Token Cost: Claude Sonnet 5.5 is $10.00/1M vs Gemini 3.8 Flash at $3.75/1M
- Context Window: Claude Sonnet 5.5 supports 1,000k tokens vs Gemini 3.8 Flash with 1,000k tokens
- Benchmark Intelligence Rating: Claude Sonnet 5.5 scores 55/100 vs Gemini 3.8 Flash at 31/100 (AA Index v5)
- Inference Latency: Claude Sonnet 5.5 is rated Fast vs Gemini 3.8 Flash rated Fast
Calculate Your Team's Exact Bill Difference
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Deploying Gemini 3.8 Flash over Claude Sonnet 5.5 saves $65.63/mo ($788/yr) at this volume.
Frequently Asked Questions
Is Claude Sonnet 5.5 cheaper than Gemini 3.8 Flash?
Gemini 3.8 Flash is significantly more economical, charging $0.75/1M input compared to $2.00/1M for Claude Sonnet 5.5.
Which model should I choose for production?
If your primary constraint is API cost and high query throughput, choose Gemini 3.8 Flash. If you require peak reasoning accuracy and complex tool use, Claude Sonnet 5.5 is recommended.
How does context window compare between Claude Sonnet 5.5 and Gemini 3.8 Flash?
Claude Sonnet 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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