Claude Opus 5.5 vs Gemini 3.8 Flash
Compare Claude Opus 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 Opus 5.5 charges $4.00/1M input and $20.00/1M output tokens, compared to Gemini 3.8 Flash at $0.75/1M input and $3.75/1M output. Gemini 3.8 Flash is 5.3x 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 3.8 Flash provides 113 t/s (20.0s TTFT).
Full Metric & Specification Comparison
| Metric | Claude Opus 5.5 | Gemini 3.8 Flash | Advantage |
|---|---|---|---|
| Provider | Anthropic | - | |
| Input Token Cost (1M) | $4.000 | $0.750 | Gemini 3.8 Flash |
| Output Token Cost (1M) | $20.000 | $3.750 | Gemini 3.8 Flash |
| Context Window | 1,000k tokens | 1,000k tokens | Tie |
| AA Intelligence Index | 59/100 | 31/100 | Claude Opus 5.5 |
| Streaming Latency | Fast | Fast | - |
Key Architectural Takeaways
- Input Token Cost: Claude Opus 5.5 is $4.00/1M vs Gemini 3.8 Flash at $0.75/1M
- Output Token Cost: Claude Opus 5.5 is $20.00/1M vs Gemini 3.8 Flash at $3.75/1M
- Context Window: Claude Opus 5.5 supports 1,000k tokens vs Gemini 3.8 Flash with 1,000k tokens
- Benchmark Intelligence Rating: Claude Opus 5.5 scores 59/100 vs Gemini 3.8 Flash at 31/100 (AA Index v5)
- Inference Latency: Claude Opus 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 Opus 5.5 saves $170.63/mo ($2048/yr) at this volume.
Frequently Asked Questions
Is Claude Opus 5.5 cheaper than Gemini 3.8 Flash?
Gemini 3.8 Flash is significantly more economical, charging $0.75/1M 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 3.8 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 Gemini 3.8 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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