Claude Sonnet 5.5 vs Gemini 3.1 Pro (Preview)
Claude Sonnet 5.5 from Anthropic and Gemini 3.1 Pro (Preview) from Google, side by side. Every figure comes from the model registry. No markup on model usage: you pay the provider's list price.
| Attribute |   Claude Sonnet 5.5 |  Gemini 3.1 Pro (Preview) |
|---|---|---|
| Provider | Anthropic | |
| Model id | anthropic/claude-sonnet-5-5 | google/gemini-3.1-pro-preview |
| Status | Available via Safeguard | Available via Safeguard |
| Input / 1M tokens | $2 | $2 |
| Output / 1M tokens | $10 | $12 |
| Price notes | Base price, full 1M context at standard rate. Cache hits $0.10/1M. Batch 50% off. | Preview model. Prompts <=200K tokens, over 200K: $4 in / $18 out. Output includes thinking tokens. No free tier. |
| Context | 1M | 1.05M |
| Parameters | Not published | Not published |
| Max output | 128,000 tokens | 65,536 tokens |
| Modality | Text and image | Text and image |
| Weights | Closed | Closed |
| Zero data retention | Available | Not offered |
| Prompts go to | Anthropic (global routing by default) | Google (Gemini Developer API) |
| Retention | Not used for model training without express permission, per Anthropic's API retention doc, conversation content is not retained by default except for Covered Models that require 30-day retention, flagged content and legal holds can be kept longer | Paid tier: prompts and responses not used to improve Google products, but logged for a limited period for abuse monitoring, free tier content may be used to improve products |
| Region | Global by default, US-only inference via inference_geo at 1.1x pricing (Claude 4.6 and later) | No region guarantee, data may be stored transiently or cached in any country where Google operates. Google points ZDR and enterprise processing needs to Vertex AI (Gemini Enterprise Agent Platform) |
| Price checked | 2026-10-08 | 2026-10-08 |
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