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Google · Efficient

Gemini 2.5 Flash Preview (09/2025) – Thinking

Added Sep 25, 2025

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Use in the app

Same checkpoint with thinking enabled by default for deeper reasoning and stepwise analysis on complex tasks. Routed to Gemini 2.5 Flash Thinking (stable).

  • Reasoning
  • Tools
  • Vision
  • Structured output
  • PDF input
  • Audio input
Input
Text, Images, Audio
Output
Text
Reasoning effort
low · medium · high
Discovery tier
Efficient

Pricing

USD per 1M tokens
Input
$0.30
Output
$2.50
Cache read
$0.03

Reference prices as published by the model provider. API example

Specifications

Context window
1M
Max output
65.5K

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Public evaluations

Benchmarks

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

Intelligence Index

15.5

Better than 39% of 326 scored models

3.8Catalog models by score55.1

Indexes

  • Math Index

    78.3

    Composite of the math evaluations

    Better than 72% of 118 scored models

Document reasoning

  • AA-LCRv1.1

    71.0%

    Reasoning across long documents

    Better than 52% of 309 scored models

Reasoning and knowledge

  • Humanity’s Last Exam

    13.8%

    Expert-level questions across academic fields

    Better than 40% of 323 scored models

  • GPQA Diamond

    79.3%

    Graduate-level science questions

    Better than 47% of 291 scored models

  • MMLU-Pro

    84.2%

    Multi-subject knowledge and reasoning

    Better than 84% of 132 scored models

  • IFBench

    52.3%

    Following precise output instructions

    Better than 52% of 215 scored models

Coding

  • LiveCodeBench

    71.3%

    Recent competitive programming problems

    Better than 72% of 129 scored models

Math

  • AIME 2025

    78.3%

    Competition mathematics, 2025 problems

    Better than 72% of 118 scored models

Legacy evaluations

  • Terminal-Bench Hard

    16.7%

    Earlier terminal task suite

    Better than 35% of 212 scored models

  • τ²-Bench Telecom

    45.6%

    Tool use in a customer-support simulation

    Better than 36% of 214 scored models

  • AA-LCR (unversioned)

    71.0%

    Long-context reasoning, earlier grading

    Better than 52% of 309 scored models

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)
99.4%
Reliable
Hourly request success · last 72 hoursLowest hour 100.0%
  • 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-09-2025-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-09-2025-thinking",
    messages=[{"role": "user", "content": "Explain this stack trace."}],
)
print(reply.choices[0].message.content)

Google

Other Google models, starting with the same family.