Claude 4 Sonnet vs Gemini 3.1 Pro
Deprecated mid-tier vs Google's flagship — 40% cheaper with 10x context. The comprehensive migration analysis.
Pricing data verified: Jun 11, 2026
| Specification | Claude 4 Sonnet | Gemini 3.1 Pro |
|---|---|---|
| Input Price (per 1M tokens) | $3.00 | $1.25 |
| Output Price (per 1M tokens) | $15.00 | $10.00 |
| Context Window | 200K tokens | 2M tokens |
| Tier | Mid-Tier | Mid-Tier |
| Provider | Anthropic | |
| License | Proprietary | Proprietary |
| Self-Hostable | No | No |
| Status | Deprecated Jun 15 | Active |
| Cost at 1M input + 500K output | $10.50 | $6.25 |
Calculate Your Exact Costs
Enter your usage to compare costs between Claude 4 Sonnet and Gemini 3.1 Pro.
Which Model for Which Use Case?
Long-Context Analysis
Gemini 3.1 Pro's 2M context window is 10x larger than Claude 4 Sonnet's 200K. Ideal for analyzing massive documents, entire codebases, or long multi-turn conversations that need to retain extensive history.
Code Generation
Claude Sonnet has traditionally excelled at code generation and instruction following. For code-heavy workloads, Claude Sonnet 4.6 is the direct Anthropic successor at the same price point.
Multimodal Tasks
Gemini 3.1 Pro offers native video, audio, and image understanding. For multimodal workloads that combine text with other media, Gemini is the stronger choice.
Budget-Conscious Production
Gemini 3.1 Pro is 58% cheaper on input and 33% cheaper on output. For production workloads where cost matters, Gemini delivers the best value in the mid-tier category.
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Frequently Asked Questions
Is Gemini 3.1 Pro cheaper than Claude 4 Sonnet?
Yes. Gemini 3.1 Pro costs $1.25/M input and $10.00/M output, while Claude 4 Sonnet costs $3.00/M input and $15.00/M output. That makes Gemini 3.1 Pro 58% cheaper on input and 33% cheaper on output. Gemini also offers 2M context (10x more than Sonnet's 200K). For a workload of 1M input + 500K output, Gemini 3.1 Pro costs $6.25 vs Claude 4 Sonnet's $10.50 — a 40% savings.
What's the quality difference between Claude 4 Sonnet and Gemini 3.1 Pro?
Both are top-tier models. Sonnet excels at coding and instruction following. Gemini 3.1 Pro leads in multimodal tasks and long-context analysis. For most production workloads, quality is comparable.
How do I migrate from Claude 4 Sonnet to Gemini 3.1 Pro?
Update API endpoint to generativelanguage.googleapis.com. Replace Anthropic SDK with Google AI SDK. Adjust prompt format (system messages work differently). Test with your specific use case before full migration.
What are the best alternatives to Claude 4 Sonnet?
Top alternatives: (1) Gemini 3.1 Pro ($1.25/$10) — cheapest mid-tier option with 2M context. (2) Claude Sonnet 4.6 ($3/$15) — direct Anthropic successor, 200K context. (3) GPT-5 ($1.25/$10) — comparable pricing, 272K context. (4) DeepSeek V4 Pro ($0.44/$0.87) — 97% cheaper, 1M context.