Claude Opus 4.8 vs Gemini 3.1 Pro
Anthropic's flagship model meets Google's latest Pro. Same 1M context, different price tiers — find out which delivers better value for your workload.
Pricing data verified: Jun 5, 2026
| Specification | Claude Opus 4.8 (Anthropic) | Gemini 3.1 Pro (Google) |
|---|---|---|
| Input Price (per 1M tokens) | $5.00 | $2.00 |
| Output Price (per 1M tokens) | $25.00 | $12.00 |
| Context Window | 1M tokens | 1M tokens |
| Tier | Premium | Mid |
| Provider | Anthropic |
Calculate Your Exact Costs
Premium vs Mid-tier with the same context window — see the real cost difference.
Other Premium-Tier Models
Which Model for Which Use Case?
Research & Analysis
Complex multi-step reasoning and data synthesis. Claude Opus 4.8's premium reasoning may edge out for nuanced tasks, but Gemini 3.1 Pro costs 54% less.
Long Document Processing
Both have 1M context windows. For document-heavy workloads, Gemini 3.1 Pro's lower pricing makes it the clear value winner.
Complex Code Generation
Architectural decisions, multi-file refactoring, debugging. Both handle complex code well. Claude's instruction-following may give it an edge for precise specs.
AI Agents & Autonomous Tasks
Multi-step autonomous workflows. Output-heavy by nature — Gemini 3.1 Pro's 52% cheaper output pricing makes a meaningful difference at scale.
Comparing premium workloads?
APIpulse Pro lets you compare all 39 models including GPT-5.5 Pro ($30/$180), save scenarios, and export cost reports for your team.
Frequently Asked Questions
Is Claude Opus 4.8 more expensive than Gemini 3.1 Pro?
Yes. Claude Opus 4.8 costs $5/$25 per 1M tokens. Gemini 3.1 Pro costs $2/$12 per 1M tokens. Gemini is 60% cheaper on input and 52% cheaper on output — a significant difference at scale.
Which has a larger context window?
Both Claude Opus 4.8 and Gemini 3.1 Pro offer 1M token context windows. They're equally capable for processing very long documents, codebases, or extended conversations.
When should I choose Claude Opus 4.8 over Gemini 3.1 Pro?
Choose Claude Opus 4.8 when you need Anthropic's safety-focused approach, nuanced reasoning, or specific capabilities where Claude excels (like long-form writing and complex analysis). Choose Gemini 3.1 Pro when cost is a primary concern and you want 1M context at a mid-tier price point.
How do these compare to GPT-5.5?
GPT-5.5 costs $5/$30 per 1M tokens — same input as Claude Opus 4.8 but 20% more expensive on output. Gemini 3.1 Pro is the cheapest of the three at $2/$12. All three have 1M context windows.