Last verified 2025-09-22 (left) · 2025-11-26 (right)

Claude Sonnet 3.7 (Legacy) vs Gemini 3 Pro Preview — Pricing & Capability Comparison

Claude Sonnet 3.7 (Legacy) charges $3.00 per million input tokens and $15.00 per million output tokens. Gemini 3 Pro Preview comes in at $2.00 / $12.00. Context windows span 200K vs 2M tokens respectively.

TL;DR — Quick Comparison

✓Gemini 3 Pro Preview is cheaper overall: $14.00 per 1M tokens (in+out) vs $18.00 for Claude Sonnet 3.7 (Legacy) — saves $4.00 per 1M tokens
✓Input pricing: Claude Sonnet 3.7 (Legacy) $3.00/1M vs Gemini 3 Pro Preview $2.00/1M
✓Output pricing: Claude Sonnet 3.7 (Legacy) $15.00/1M vs Gemini 3 Pro Preview $12.00/1M
✓Context window: Gemini 3 Pro Preview offers more (2M vs 200K)
✓Use our calculator below to estimate costs for your specific usage pattern

Input price (per 1M)

Claude Sonnet 3.7 (Legacy)

$3.00

Gemini 3 Pro Preview

$2.00

Gemini 3 Pro Preview leads here

Output price (per 1M)

Claude Sonnet 3.7 (Legacy)

$15.00

Gemini 3 Pro Preview

$12.00

Gemini 3 Pro Preview leads here

Context window

Claude Sonnet 3.7 (Legacy)

200,000 tokens

Gemini 3 Pro Preview

2,000,000 tokens

Gemini 3 Pro Preview leads here

Cached input

Claude Sonnet 3.7 (Legacy)

Not published

Gemini 3 Pro Preview

$0.200

Gemini 3 Pro Preview leads here

Which one should you choose?

Skip the spreadsheet if you just need the practical takeaway. Use these rules when deciding between Claude Sonnet 3.7 (Legacy) and Gemini 3 Pro Preview.

Choose Gemini 3 Pro Preview if input tokens dominate your bill

Gemini 3 Pro Preview has the lower input rate, which usually matters most for chat, RAG, classification, and long-prompt workflows where prompt volume stays much larger than generated output.

Choose Gemini 3 Pro Preview if you generate long answers

Gemini 3 Pro Preview is cheaper on output tokens, so it tends to win for report generation, coding assistance, reasoning traces, and any workflow where completions are long.

Choose Gemini 3 Pro Preview if context size is the blocker

Gemini 3 Pro Preview offers the larger published context window, which is more important than small pricing differences when you need to fit large files, long chats, or multi-document prompts into one request.

Cost comparison for 10K-token workloads

Side-by-side pricing for identical workloads (10,000 total tokens per request) across different distributions.

Scenario	Claude Sonnet 3.7 (Legacy)	Gemini 3 Pro Preview	Gemini 3 Pro Preview cached
Balanced conversation 50% input · 50% output	$0.0900	$0.0700	$0.0610
Input-heavy workflow 80% input · 20% output	$0.0540	$0.0400	$0.0256
Generation heavy 30% input · 70% output	$0.114	$0.0900	$0.0846
Cached system prompt 90% cached input · 10% fresh output	$0.0420	$0.0300	$0.0138

Frequently asked questions

Which is cheaper: Claude Sonnet 3.7 (Legacy) or Gemini 3 Pro Preview?

Gemini 3 Pro Preview is cheaper for input tokens at $2.00 per 1M tokens compared to $3.00. For output, Gemini 3 Pro Preview costs $12.00 per 1M tokens versus $15.00 for Claude Sonnet 3.7 (Legacy).

What is the cost per 1M tokens for Claude Sonnet 3.7 (Legacy)?

Claude Sonnet 3.7 (Legacy) pricing: $3.00 per 1M input tokens and $15.00 per 1M output tokens. Context window: 200,000 tokens.

What is the cost per 1M tokens for Gemini 3 Pro Preview?

Gemini 3 Pro Preview pricing: $2.00 per 1M input tokens and $12.00 per 1M output tokens. Context window: 2,000,000 tokens.

How much does it cost per 1K tokens?

Per 1K tokens: Claude Sonnet 3.7 (Legacy) costs $0.0030 input / $0.0150 output. Gemini 3 Pro Preview costs $0.0020 input / $0.0120 output. This is useful for calculating small-scale usage costs.

Which model supports a larger context window?

Gemini 3 Pro Preview offers 2,000,000 tokens (2M) versus 200K for Claude Sonnet 3.7 (Legacy).

What is the estimated monthly cost for typical usage?

For a typical workload of 10M input + 2M output tokens per month: Claude Sonnet 3.7 (Legacy) would cost approximately $60.00, while Gemini 3 Pro Preview would cost $44.00. Gemini 3 Pro Preview is more economical for this usage pattern.

Do these models support prompt caching?

Claude Sonnet 3.7 (Legacy) does not publish cached pricing. Gemini 3 Pro Preview supports caching at $0.200 per 1M tokens, saving up to 90%.

Which model is best for my use case?

Choose Gemini 3 Pro Preview for cost-sensitive applications with high input volume. Choose Gemini 3 Pro Preview if you need 2M context for long documents or conversations. Consider prompt caching if you have repeated context. Use our token calculator to model your specific usage pattern.