Google Gemini Pro Latest vs GPT-5.1, API pricing and model comparison

Compare Google Gemini Pro Latest vs GPT-5.1 side by side by input/output token price, context window, benchmark signals, capabilities, and example monthly API cost.

Quick comparison summary

This page compares Google Gemini Pro Latest vs GPT-5.1 in one matrix. Current records: Google Gemini Pro Latest on OpenRouter: $2/$12 per 1M tokens, 1049K context window; GPT-5.1 on OpenRouter: $1.25/$10 per 1M tokens, 400K context window. Prices are estimates—verify official provider pages before production use.

Gemini Pro Latest

~google/gemini-pro-latest

OpenRouter

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

GPT-5.1

openai/gpt-5.1

OpenRouter

Input: $1.25 / 1M
Output: $10.00 / 1M
Context: 400k
Model page: Details

Comparison matrixLLM Table

Models to compare2/4

Model 1

1.0M

Select model344 models

Model 2

400K

Select model344 models

Google Gemini Pro Latest

OpenRouter

Input

$2.00 / 1M

Output

$12.00 / 1M

Context

1.0MLargest context

Monthly cost

$560.00

Benchmark

—

VisionToolsJSONReasoningAudioLong context

OpenAI: GPT-5.1

OpenRouter

Cheapest (this scenario)

Input

$1.25 / 1M

Output

$10.00 / 1M

Context

400K

Monthly cost

$425.00

Benchmark

1,455Top benchmarkLMArena Text Arena

VisionToolsJSONReasoningLong context

Google Gemini Pro Latest

OpenRouter

OpenAI: GPT-5.1

OpenRouter

Input

$2.00 / 1M

$1.25 / 1MCheapest (this scenario)

Output

$12.00 / 1M

$10.00 / 1MCheapest (this scenario)

Context

1.0MLargest context

400K

Benchmark

—

1,455Top benchmark

LMArena Text Arena

Monthly cost

$560.00

$425.00Cheapest (this scenario)

Capabilities

VisionToolsJSONReasoningAudioLong context

VisionToolsJSONReasoningLong context

FAQ

Model comparison notes

How do Google Gemini Pro Latest vs GPT-5.1 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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