When to Choose Each Option
Clear guidance based on your specific situation and needs.
Our Recommendation
Pick by workload, not by headline. Claude Opus 4.8 is the model to beat for hard, agentic coding: 88.6% on SWE-bench Verified versus Gemini 3.1 Pro's 80.6%, plus dynamic workflows that fan out hundreds of parallel subagents and a 2.5x fast mode at the same base price. If correctness on complex code changes is what you are paying for, Opus earns its premium. Gemini 3.1 Pro wins the economics and the generalist reasoning: input tokens cost $2 per million against Opus's $5, output $12 against $25, and it leads on abstract reasoning (77.1% ARC-AGI-2) and science QA (94.3% GPQA Diamond) with a native multimodal stack. For high-volume, cost-sensitive pipelines, long-context document work, or multimodal tasks, Gemini is the rational default. Many teams run both: Opus for the hardest coding and agent runs, Gemini 3.1 Pro for everything where price-per-token and multimodal breadth matter more than the last few points of coding accuracy. If a 2M-token window is your blocker, wait for Gemini 3.5 Pro rather than forcing today's models.
- Choose Gemini 3.1 Pro when...
- Token cost and throughput drive your budget more than the last points of coding accuracy
- You run long-context document analysis or native multimodal tasks (image, video, audio)
- You need strong abstract reasoning and science-QA performance
- You are building high-volume, cost-sensitive pipelines
- Choose Claude Opus 4.8 when...
- You need the highest coding accuracy on hard, real-world code changes
- You run agentic workflows with many parallel subagents
- Fewer code bugs and higher reliability justify a premium price
- You want a fast mode that keeps the same base pricing