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  1. Home
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Gemini 3.5 Flash vs Gemini 2.5 Flash

Compare Gemini 3.5 Flash from Google and Gemini 2.5 Flash from Google on key metrics including benchmarks, price, context length, and other model features. Access both models and hundreds of others through the OpenRouter API.

Favicon for google
Gemini 3.5 Flash
Favicon for google
Gemini 2.5 Flash
Favicon for google
Gemini 3.5 Flash
Favicon for google
Gemini 2.5 Flash

Overview

Gemini 3.5 Flash
Author
Google
Gemini 2.5 Flash
Author
Google
Gemini 3.5 Flash
Context length
1.05Mtokens
Gemini 2.5 Flash
Context length
1.05Mtokens
Gemini 3.5 Flash
Reasoning
Gemini 2.5 Flash
Reasoning
Gemini 3.5 Flash
Input modalities
Gemini 2.5 Flash
Input modalities
Gemini 3.5 Flash
Output modalities
Gemini 2.5 Flash
Output modalities

Gemini 3.5 Flash vs Gemini 2.5 Flash: side-by-side summary

Gemini 3.5 Flash and Gemini 2.5 Flash are available through the OpenRouter API, so switching between them takes a model slug change rather than a new integration.

Gemini 3.5 Flash, from Google, has a 1,048,576-token context window and is priced at $1.50/M tokens input, $9/M tokens output on OpenRouter.

Gemini 2.5 Flash, from Google, has a 1,048,576-token context window and is priced at $0.30/M tokens input, $2.50/M tokens output on OpenRouter.

Context window
  • Gemini 3.5 Flash: 1,048,576 tokens
  • Gemini 2.5 Flash: 1,048,576 tokens
Price
  • Gemini 3.5 Flash: $1.50/M tokens input, $9/M tokens output
  • Gemini 2.5 Flash: $0.30/M tokens input, $2.50/M tokens output
Provided by
  • Gemini 3.5 Flash: Google
  • Gemini 2.5 Flash: Google
  • model details, providers and pricing
Gemini 3.5 Flash
model details, providers and pricing
Gemini 2.5 Flash

Gemini 3.5 Flash vs Gemini 2.5 Flash at a glance

Gemini 3.5 Flash vs Gemini 2.5 Flash comparison
Gemini 3.5 FlashGemini 2.5 Flash
Input price$1.50/M tokens$0.30/M tokens
Output price$9/M tokens$2.50/M tokens
Context window1,048,576 tokens1,048,576 tokens
Intelligence Index33.615.5
Coding IndexNot availableNot available
Agentic IndexNot availableNot available
Latency (p50)12.82 s1.10 s
Throughput (p50)6.0 tok/s73.0 tok/s

Oct 5, 2026

Is Gemini 3.5 Flash cheaper than Gemini 2.5 Flash?

Gemini 2.5 Flash is cheaper than Gemini 3.5 Flash on OpenRouter: Gemini 2.5 Flash costs $0.30/M tokens input and $2.50/M tokens output, while Gemini 3.5 Flash costs $1.50/M tokens input and $9/M tokens output.

Which has the longer context window, Gemini 3.5 Flash or Gemini 2.5 Flash?

Gemini 3.5 Flash and Gemini 2.5 Flash have the same context window of 1,048,576 tokens.

Which is faster, Gemini 3.5 Flash or Gemini 2.5 Flash?

Gemini 2.5 Flash is faster on OpenRouter, generating a median 73.0 tokens per second compared with 6.0 tokens per second for Gemini 3.5 Flash.

Attribute
Benchmark data updated
Frequently asked questions