Gemma 4 31B vs GPT-5 Codex, API pricing and model comparison

Compare Gemma 4 31B vs GPT-5 Codex side by side by input/output token price, context window, benchmark signals, capabilities, and example monthly API cost.

Quick comparison summary

This page compares Gemma 4 31B vs GPT-5 Codex in one matrix. Current records: Gemma 4 31B on OpenRouter: $0.12/$0.37 per 1M tokens, 262K context window; GPT-5 Codex on OpenRouter: $1.25/$10 per 1M tokens, 400K context window. Prices are estimates—verify official provider pages before production use.

Gemma 4 31B

google/gemma-4-31b-it

OpenRouter

Input: $0.1200 / 1M
Output: $0.3700 / 1M
Context: 262.1k
Model page: Details

GPT-5 Codex

openai/gpt-5-codex

OpenRouter

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

Comparison matrixLLM Table

Models to compare2/4

Model 1

262.1K

Select model344 models

Model 2

400K

Select model344 models

Google: Gemma 4 31B

OpenRouter

Cheapest (this scenario)

Input

$0.1200 / 1M

Output

$0.3700 / 1M

Context

262.1K

Monthly cost

$23.10

Benchmark

1,452Top benchmarkLMArena Text Arena

VisionToolsJSONReasoningLong context

OpenAI: GPT-5 Codex

OpenRouter

Input

$1.25 / 1M

Output

$10.00 / 1M

Context

400KLargest context

Monthly cost

$425.00

Benchmark

—

VisionToolsJSONReasoningLong context

Google: Gemma 4 31B

OpenRouter

OpenAI: GPT-5 Codex

OpenRouter

Input

$0.1200 / 1MCheapest (this scenario)

$1.25 / 1M

Output

$0.3700 / 1MCheapest (this scenario)

$10.00 / 1M

Context

262.1K

400KLargest context

Benchmark

1,452Top benchmark

LMArena Text Arena

—

Monthly cost

$23.10Cheapest (this scenario)

$425.00

Capabilities

VisionToolsJSONReasoningLong context

FAQ

Model comparison notes

How do Gemma 4 31B vs GPT-5 Codex 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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