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Gemini 2.5 Flash Lite Preview (09/2025) – Thinking

Added Sep 25, 2025

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Use in the app

Deprecated compatibility alias. Requests route to Gemini 2.5 Flash Lite with the stable thinking path.

  • 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
$0.10
Output
$0.40
Cache read
$0.01

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 Lite Preview (09/2025) – 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 Lite Preview (09/2025) – ThinkingGoogleThis modelGemini 2.5 Flash LiteGoogleRemove
ProviderGoogleGoogle
Discovery tierEfficientEfficient
AddedSep 25, 2025Jun 17, 2025
Limits
Context window1.05M1.05M
Max output65.54K65.54K
Average output—42 tokens
Pricing, USD per 1M tokens
Input$0.10$0.10
Output$0.40$0.40
Cache read$0.01$0.01
Performance
Throughput—250.0 tok/s
Time to first token—0.5 s
Request success (24h)72.1%99.5%Best
Benchmark indexes
Intelligence Index10.4Best6.7
Math Index68.7Best35.3
Capabilities
ReasoningYesYes
ToolsYesYes
VisionYesYes
Structured outputYesNo
PDF inputYesNo
Audio inputYesYes
Video inputNoYes
Reasoning effortlow, medium, highlow, medium, high

Public evaluations

Benchmarks

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

  • Gemini 2.5 Flash Lite Preview (09/2025) – Thinking
  • Gemini 2.5 Flash Lite

Intelligence Index

  • Gemini 2.5 Flash Lite Preview (09/2025) – Thinking10.4
  • Gemini 2.5 Flash Lite6.7

Gemini 2.5 Flash Lite Preview (09/2025) – Thinking: Better than 22% of 326 scored models

3.8Catalog models by score55.1

Indexes

  • Math Index

    Composite of the math evaluations

    • Gemini 2.5 Flash Lite Preview (09/2025) – Thinking: 68.7Top
    • Gemini 2.5 Flash Lite: 35.3

Document reasoning

  • AA-LCRv1.1

    Reasoning across long documents

    • Gemini 2.5 Flash Lite Preview (09/2025) – Thinking: 64.7%Top
    • Gemini 2.5 Flash Lite: 32.0%

Reasoning and knowledge

  • Humanity’s Last Exam

    Expert-level questions across academic fields

    • Gemini 2.5 Flash Lite Preview (09/2025) – Thinking: 7.0%Top
    • Gemini 2.5 Flash Lite: 3.7%

  • GPQA Diamond

    Graduate-level science questions

    • Gemini 2.5 Flash Lite Preview (09/2025) – Thinking: 70.9%Top
    • Gemini 2.5 Flash Lite: 47.4%

  • MMLU-Pro

    Multi-subject knowledge and reasoning

    • Gemini 2.5 Flash Lite Preview (09/2025) – Thinking: 80.8%Top
    • Gemini 2.5 Flash Lite: 72.4%

  • IFBench

    Following precise output instructions

    • Gemini 2.5 Flash Lite Preview (09/2025) – Thinking: 52.6%Top
    • Gemini 2.5 Flash Lite: 31.5%

Coding

  • LiveCodeBench

    Recent competitive programming problems

    • Gemini 2.5 Flash Lite Preview (09/2025) – Thinking: 68.8%Top
    • Gemini 2.5 Flash Lite: 40.0%

Math

  • AIME 2025

    Competition mathematics, 2025 problems

    • Gemini 2.5 Flash Lite Preview (09/2025) – Thinking: 68.7%Top
    • Gemini 2.5 Flash Lite: 35.3%

  • AIME

    Competition mathematics

    • Gemini 2.5 Flash Lite Preview (09/2025) – Thinking: —
    • Gemini 2.5 Flash Lite: 50.0%

  • MATH-500

    Competition math problems

    • Gemini 2.5 Flash Lite Preview (09/2025) – Thinking: —
    • Gemini 2.5 Flash Lite: 92.6%

Legacy evaluations

  • Terminal-Bench Hard

    Earlier terminal task suite

    • Gemini 2.5 Flash Lite Preview (09/2025) – Thinking: 12.9%Top
    • Gemini 2.5 Flash Lite: 2.3%

  • τ²-Bench Telecom

    Tool use in a customer-support simulation

    • Gemini 2.5 Flash Lite Preview (09/2025) – Thinking: 30.7%Top
    • Gemini 2.5 Flash Lite: 19.0%

  • AA-LCR (unversioned)

    Long-context reasoning, earlier grading

    • Gemini 2.5 Flash Lite Preview (09/2025) – Thinking: 64.7%Top
    • Gemini 2.5 Flash Lite: 32.0%

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)
72.1%
Failing
Hourly request success · last 72 hoursLowest hour 33.9%
  • 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-lite-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-lite-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.