Claude Opus 5 (Fast) vs Google: Gemini 3.1 Pro Preview Custom Tools
Head-to-head API cost, context, and performance comparison. Synced at 4:58:09 PM.
Executive Summary
When evaluating Claude Opus 5 (Fast) against Google: Gemini 3.1 Pro Preview Custom Tools, the pricing structure is a key differentiator. Google: Gemini 3.1 Pro Preview Custom Tools is approximately 77% more cost-effective per 1 million tokens overall.
However, when looking at raw reasoning capabilities, Claude Opus 5 (Fast) leads with a statistical ELO score of 1654. For tasks involving complex logic, coding, or instruction-following, developers might prefer Claude Opus 5 (Fast), provided their budget allows for the API burn rate.
You are losing 77%
per million tokens by hardcoding Claude Opus 5 (Fast).
Stop guessing exactly which model to route to. Deploy the 0ms Intelligence Engine to automatically arbitrage this 77% gap in your production environment instantly.
Raw Technical comparison
Verdict
If you are looking for pure performance and capability, Claude Opus 5 (Fast) is statistically superior. However, if API burn rate is the primary concern, Google: Gemini 3.1 Pro Preview Custom Tools wins out aggressively in pricing.
People Also Ask
Is Claude Opus 5 (Fast) cheaper than Google: Gemini 3.1 Pro Preview Custom Tools?
No. Google: Gemini 3.1 Pro Preview Custom Tools is the more cost-effective model, operating at a lower price point per 1 million tokens.
Which model has the larger context window?
The Google: Gemini 3.1 Pro Preview Custom Tools model has the advantage in memory, offering a massive 1,048,576 token limit for document ingestion.