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

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

Reasoning
Vision
Audio Input
Native PDF input
Tool Calling
Structured Output

Added Sep 25, 2025

Pricing

Auto routing · per 1M tokens

Input: $0.10
Output: $0.40
Cache read: $0.010

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Specifications

Context window: 1M
Max output: 65.5K

Benchmarks

Artificial Analysis

LMArena

Vectara

Sourced from Artificial Analysis.

Intelligence Index

10.4

Better than 41% of models compared

Agentic work

T²-Bench Telecom (legacy)

Legacy fallback · Conversational AI agents in dual-control scenarios

30.7%

Better than 38% of models compared

Document reasoning

AA-LCR v1.1

Long context reasoning with updated grading

64.7%

Better than 56% of models compared

Reasoning

HLE

Humanity's Last Exam

7.0%

Better than 42% of models compared

IFBench

Instruction-following benchmark

52.6%

Better than 63% of models compared

CritPt

Research-level physics reasoning

0.0%

Coding

Terminal-Bench Hard (legacy)

Legacy fallback · Agentic coding and terminal use

12.9%

Better than 49% of models compared

LiveCodeBench

Contamination-free coding benchmark

68.8%

Better than 77% of models compared

Math

AIME 2025

American Invitational Mathematics Examination 2025

68.7%

Better than 63% of models compared

Knowledge

MMLU-Pro

Professional and academic subject knowledge

80.8%

Better than 71% of models compared

AA-Omniscience Accuracy

Proportion of correctly answered questions

18.0%

AA-Omniscience Hallucination Rate

Rate of incorrect answers among non-correct responses

87.8%

Legacy benchmarks

GPQA Diamond (legacy)

Graduate-level scientific reasoning

70.9%

Better than 50% of models compared

AA-LCR (unversioned / legacy)

Long context reasoning evaluation