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Google · Efficient

Gemini 2.5 Flash 0520 Thinking

Added May 20, 2025

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Use in the app

Deprecated. Mapped to Gemini 2.5 Flash because this model is deprecated

  • Reasoning
  • Vision
Input
Text, Images
Output
Text
Reasoning effort
low · medium · high
Discovery tier
Efficient

Pricing

USD per 1M tokens
Input
$0.15
Output
$3.50
Cache read
$0.015

Reference prices as published by the model provider. API example

Specifications

Context window
1M
Max output
65.5K

Side by side

Gemini 2.5 Flash 0520 Thinking compared

Specifications, prices, speed and benchmark scores next to each other. Benchmarks below show every compared model too.

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Gemini 2.5 Flash 0520 ThinkingGoogleThis modelGPT 5 NanoOpenAIRemove
ProviderGoogleOpenAI
Discovery tierEfficientEfficient
AddedMay 20, 2025Aug 7, 2025
Limits
Context window1.05MBest400K
Max output65.54K128KBest
Average output—322 tokens
Pricing, USD per 1M tokens
Input$0.15$0.05Best
Output$3.50$0.40Best
Cache read$0.015$0.005Best
Performance
Throughput—96.6 tok/s
Time to first token—1.8 s
Request success (24h)99.3%99.9%Best
Benchmark indexes
Intelligence Index13.1Best13.0
Math Index73.383.7Best
Capabilities
ReasoningYesYes
VisionYesYes
Reasoning effortlow, medium, highminimal, low, medium, high

Public evaluations

Benchmarks

Independent evaluation results, with how each score ranks among the models in the Noumen catalog.

  • Gemini 2.5 Flash 0520 Thinking
  • GPT 5 Nano

Intelligence Index

  • Gemini 2.5 Flash 0520 Thinking13.1
  • GPT 5 Nano13.0

Gemini 2.5 Flash 0520 Thinking: Better than 32% of 326 scored models

3.8Catalog models by score55.1

Indexes

  • Math Index

    Composite of the math evaluations

    • Gemini 2.5 Flash 0520 Thinking: 73.3
    • GPT 5 Nano: 83.7Top

Document reasoning

  • AA-LCRv1.1

    Reasoning across long documents

    • Gemini 2.5 Flash 0520 Thinking: 65.3%Top
    • GPT 5 Nano: 45.0%

Reasoning and knowledge

  • Humanity’s Last Exam

    Expert-level questions across academic fields

    • Gemini 2.5 Flash 0520 Thinking: 12.1%Top
    • GPT 5 Nano: 9.5%

  • GPQA Diamond

    Graduate-level science questions

    • Gemini 2.5 Flash 0520 Thinking: 79.0%Top
    • GPT 5 Nano: 67.6%

  • MMLU-Pro

    Multi-subject knowledge and reasoning

    • Gemini 2.5 Flash 0520 Thinking: 83.2%Top
    • GPT 5 Nano: 78.0%

  • IFBench

    Following precise output instructions

    • Gemini 2.5 Flash 0520 Thinking: 50.3%
    • GPT 5 Nano: 67.6%Top

Coding

  • LiveCodeBench

    Recent competitive programming problems

    • Gemini 2.5 Flash 0520 Thinking: 69.5%
    • GPT 5 Nano: 78.9%Top

Math

  • AIME 2025

    Competition mathematics, 2025 problems

    • Gemini 2.5 Flash 0520 Thinking: 73.3%
    • GPT 5 Nano: 83.7%Top

  • AIME

    Competition mathematics

    • Gemini 2.5 Flash 0520 Thinking: 82.3%
    • GPT 5 Nano: —

  • MATH-500

    Competition math problems

    • Gemini 2.5 Flash 0520 Thinking: 98.1%
    • GPT 5 Nano: —

Legacy evaluations

  • Terminal-Bench Hard

    Earlier terminal task suite

    • Gemini 2.5 Flash 0520 Thinking: 13.6%Top
    • GPT 5 Nano: 12.1%

  • τ²-Bench Telecom

    Tool use in a customer-support simulation

    • Gemini 2.5 Flash 0520 Thinking: 31.6%
    • GPT 5 Nano: 36.5%Top

  • AA-LCR (unversioned)

    Long-context reasoning, earlier grading

    • Gemini 2.5 Flash 0520 Thinking: 65.3%Top
    • GPT 5 Nano: 45.0%

Scores from Artificial Analysis, updated Oct 26, 2026. Artificial Analysis

Live routing data

Performance and reliability

Recent averages across requests routed for this model. Your own speed depends on prompt length, reasoning effort and load.

Request success (24h)
99.3%
Reliable
Hourly request success · last 72 hoursLowest hour 99.0%
  • Healthy (98% or more)
  • Degraded (90–98%)
  • Down (under 90%)
  • No requests

Developers

Use it through the API

Noumen’s API is OpenAI-compatible: any Chat Completions client works with a base URL and a key.

Read the quickstart
curl https://www.noumen.xyz/api/v1/chat/completions \
  -H "Authorization: Bearer $NOUMEN_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "gemini-2.5-flash-preview-05-20:thinking",
    "reasoning_effort": "medium",
    "messages": [{ "role": "user", "content": "Explain this stack trace." }]
  }'
import os
from openai import OpenAI

client = OpenAI(base_url="https://www.noumen.xyz/api/v1", api_key=os.environ["NOUMEN_API_KEY"])
reply = client.chat.completions.create(
    model="gemini-2.5-flash-preview-05-20:thinking",
    messages=[{"role": "user", "content": "Explain this stack trace."}],
)
print(reply.choices[0].message.content)

Google

Other Google models, starting with the same family.