Claude Sonnet 4.6 vs Gemini 2.5 Pro vs Gemini 3.1 Pro Preview, API pricing and model comparison

Compare Claude Sonnet 4.6 vs Gemini 2.5 Pro vs Gemini 3.1 Pro Preview side by side by input/output token price, context window, benchmark signals, capabilities, and example monthly API cost.

Quick comparison summary

This page compares Claude Sonnet 4.6 vs Gemini 2.5 Pro vs Gemini 3.1 Pro Preview in one matrix. Current records: Claude Sonnet 4.6 on Claude API: $3/$15 per 1M tokens, 1000K context window; Gemini 2.5 Pro on Gemini API: $1.25/$10 per 1M tokens, 1049K context window; Gemini 3.1 Pro Preview on OpenRouter: $2/$12 per 1M tokens, 1049K context window. Prices are estimates—verify official provider pages before production use.

Claude Sonnet 4.6

claude-sonnet-4-6

Claude API

Input: $3.00 / 1M
Output: $15.00 / 1M
Context: 1m
Model page: Details

Gemini 2.5 Pro

gemini-2.5-pro

Gemini API

Input: $1.25 / 1M
Output: $10.00 / 1M
Context: 1.0m
Model page: Details

Gemini 3.1 Pro Preview

google/gemini-3.1-pro-preview

OpenRouter

Input: $2.00 / 1M
Output: $12.00 / 1M
Context: 1.0m
Model page: Details

Comparison matrixLLM Table

Models to compare3/4

Model 1

Select model344 models

Model 2

1.0M

Select model344 models

Model 3

1.0M

Select model344 models

Anthropic: Claude Sonnet 4.6

Claude API

Input

$3.00 / 1M

Output

$15.00 / 1M

Context

Monthly cost

$750.00

Benchmark

1,470LMArena Text Arena

VisionToolsReasoningLong context

Google: Gemini 2.5 Pro

Gemini API

Cheapest (this scenario)

Input

$1.25 / 1M

Output

$10.00 / 1M

Context

1.0MLargest context

Monthly cost

$425.00

Benchmark

1,446LMArena Text Arena

VisionToolsJSONReasoningAudioLong context

Google: Gemini 3.1 Pro Preview

OpenRouter

Input

$2.00 / 1M

Output

$12.00 / 1M

Context

1.0MLargest context

Monthly cost

$560.00

Benchmark

1,487Top benchmarkLMArena Text Arena

VisionToolsJSONReasoningAudioLong context

Anthropic: Claude Sonnet 4.6

Claude API

Google: Gemini 2.5 Pro

Gemini API

Google: Gemini 3.1 Pro Preview

OpenRouter

Input

$3.00 / 1M

$1.25 / 1MCheapest (this scenario)

$2.00 / 1M

Output

$15.00 / 1M

$10.00 / 1MCheapest (this scenario)

$12.00 / 1M

Context

1.0MLargest context

Benchmark

1,470

LMArena Text Arena

1,446

LMArena Text Arena

1,487Top benchmark

LMArena Text Arena

Monthly cost

$750.00

$425.00Cheapest (this scenario)

$560.00

Capabilities

VisionToolsReasoningLong context

VisionToolsJSONReasoningAudioLong context

FAQ

Model comparison notes

How do Claude Sonnet 4.6 vs Gemini 2.5 Pro vs Gemini 3.1 Pro Preview API prices compare?

Compare input and output prices per 1M tokens side by side. The same underlying model can list different prices by route (Direct API vs OpenRouter); this table uses the selected route records.

Which model looks cheaper?

Scenario cost depends on your input/output mix. The example monthly cost in the table uses default token volumes—adjust with the cost calculator for your traffic.

Are benchmark scores included?

Independent or provider-reported benchmark signals appear when available. Benchmarks do not replace price analysis—evaluate both for your quality requirements.

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