Claude Opus 5.5 vs Gemini 3.5 Flash-Lite
Compare Claude Opus 5.5 vs Gemini 3.5 Flash-Lite 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 Gemini 3.5 Flash-Lite at $0.30/1M input and $2.50/1M output. Gemini 3.5 Flash-Lite is 13.3x 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 Gemini 3.5 Flash-Lite provides 317 t/s (5.0s TTFT).
Full Metric & Specification Comparison
| Metric | Claude Opus 5.5 | Gemini 3.5 Flash-Lite | Advantage |
|---|---|---|---|
| Provider | Anthropic | - | |
| Input Token Cost (1M) | $4.000 | $0.300 | Gemini 3.5 Flash-Lite |
| Output Token Cost (1M) | $20.000 | $2.500 | Gemini 3.5 Flash-Lite |
| Context Window | 1,000k tokens | 1,000k tokens | Tie |
| AA Intelligence Index | 59/100 | 12/100 | Claude Opus 5.5 |
| Streaming Latency | Fast | Ultra-Fast | - |
Key Architectural Takeaways
- Input Token Cost: Claude Opus 5.5 is $4.00/1M vs Gemini 3.5 Flash-Lite at $0.30/1M
- Output Token Cost: Claude Opus 5.5 is $20.00/1M vs Gemini 3.5 Flash-Lite at $2.50/1M
- Context Window: Claude Opus 5.5 supports 1,000k tokens vs Gemini 3.5 Flash-Lite with 1,000k tokens
- Benchmark Intelligence Rating: Claude Opus 5.5 scores 59/100 vs Gemini 3.5 Flash-Lite at 12/100 (AA Index v5)
- Inference Latency: Claude Opus 5.5 is rated Fast vs Gemini 3.5 Flash-Lite rated Ultra-Fast
Calculate Your Team's Exact Bill Difference
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Deploying Gemini 3.5 Flash-Lite over Claude Opus 5.5 saves $186.75/mo ($2241/yr) at this volume.
Frequently Asked Questions
Is Claude Opus 5.5 cheaper than Gemini 3.5 Flash-Lite?
Gemini 3.5 Flash-Lite is significantly more economical, charging $0.30/1M 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 Gemini 3.5 Flash-Lite. 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 Gemini 3.5 Flash-Lite?
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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