Claude Opus 4.8 vs Gemini 3.1 Pro
Gemini 3.1 Pro is 60% cheaper on input ($2.00 vs $5.00) and 52% cheaper on output ($12.00 vs $25.00). Both offer 1M token context windows.
Pricing data verified: 2026-06-21
| 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 | 1M |
| Tier | Premium | Mid |
| Provider | Anthropic |
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Other Models to Consider
Which Model for Which Use Case?
Complex Reasoning & Coding
Claude Opus 4.8 leads on complex multi-step reasoning, code generation, and instruction-following. For tasks where quality directly impacts outcomes (production code, research, analysis), Opus 4.8 justifies its premium.
Cost-Sensitive Production
Gemini 3.1 Pro delivers strong performance at 60% lower input cost and 52% lower output cost. For high-volume workloads where quality is "good enough", the savings are substantial — roughly $285/month at moderate scale.
Long Document Processing
Both models support 1M token context windows, making either suitable for long document analysis, codebase understanding, or extended conversations. This is a tie — choose based on quality needs and budget.
Enterprise Integration
Gemini 3.1 Pro integrates tightly with Google Cloud services and Vertex AI. Claude Opus 4.8 integrates with AWS Bedrock. Choose based on your existing cloud infrastructure.
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Frequently Asked Questions
Is Gemini 3.1 Pro cheaper than Claude Opus 4.8?
Yes. Gemini 3.1 Pro costs $2.00/M input (60% cheaper than Opus 4.8's $5.00/M) and $12.00/M output (52% cheaper than Opus 4.8's $25.00/M). For most workloads, Gemini 3.1 Pro is significantly more affordable.
When would I choose Claude Opus 4.8 over Gemini 3.1 Pro?
Choose Opus 4.8 when you need Anthropic's superior reasoning, coding, and instruction-following capabilities. Opus 4.8 excels at complex multi-step tasks, nuanced writing, and safety-critical applications where quality matters more than cost.
Do both models have the same context window?
Yes, both Claude Opus 4.8 and Gemini 3.1 Pro offer 1M token context windows. Context size is not a differentiator between these two models.
How much can I save by choosing Gemini 3.1 Pro over Opus 4.8?
For a typical workload of 1,000 input tokens and 500 output tokens at 1,000 requests per day, Gemini 3.1 Pro costs roughly $240/month vs Opus 4.8's $525/month — saving you about $285/month or roughly 54%.