AI model comparison

Solar Pro 3 vs Gemini 2.5 Flash Lite

Pricing, context window, benchmarks, and features compared side by side. Or skip the guesswork and send one prompt to both.

Solar Pro 3 is Upstage's powerful Mixture-of-Experts (MoE) language model. With 102B total parameters and 12B active parameters per forward pass, it delivers exceptional performance while maintaining computational efficiency.

Input / 1M
$0.15
Output / 1M
$0.60
Context
131K

Gemini 2.5 Flash-Lite is a lightweight reasoning model in the Gemini 2.5 family, optimized for ultra-low latency and cost efficiency.

Gemini 2.5 Flash Lite is scheduled to be retired on October 20, 2026. Consider Gemini 3.1 Flash Lite instead.

Input / 1M
$0.10
Output / 1M
$0.40
Context
1.05M

At a glance

Quick verdict

How the two models stack up on the things people ask about most.

Lower price

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Gemini 2.5 Flash Lite

1.5x cheaper for a typical chat

Higher intelligence score

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Gemini 2.5 Flash Lite

10.4 vs 7.8 on Artificial Analysis

Larger context window

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Gemini 2.5 Flash Lite

1.05M vs 131K tokens

Newer release

upstage logo

Solar Pro 3

Released January 27, 2026

Benchmarks

Benchmark scores

Independent scores from Artificial Analysis. Higher is better.

Intelligence index

upstage logoSolar Pro 37.8
google logoGemini 2.5 Flash Lite10.4

Coding index

upstage logoSolar Pro 316.2
google logoGemini 2.5 Flash LiteNot available

Agentic index

upstage logoSolar Pro 31.4
google logoGemini 2.5 Flash LiteNot available

Pricing

Solar Pro 3 vs Gemini 2.5 Flash Lite API pricing

Per-token API rates. Cheaper option highlighted.

Metricupstage logoSolar Pro 3google logoGemini 2.5 Flash Lite
Input tokensPer 1M tokens$0.15$0.10
Output tokensPer 1M tokens$0.60$0.40
Cached input (read)Per 1M tokens$0.02$0.01
Cache writePer 1M tokensNot available$0.08
Web searchPer requestNot available$0.014

What it costs in practice

Estimated cost per 1,000 requests at standard rates. Coding and long-document figures also show the cost when the input is already cached.

Chat message

2K in, 500 out

upstage logoSolar Pro 3$0.60
google logoGemini 2.5 Flash Lite$0.40

Coding task

30K in, 4K out

upstage logoSolar Pro 3$6.90$2.85 cached
google logoGemini 2.5 Flash Lite$4.60$1.90 cached

Long document summary

150K in, 2K out

upstage logoSolar Pro 3$23.70$3.45 cached
google logoGemini 2.5 Flash Lite$15.80$2.30 cached

Specs

Context window and capabilities

How much each model can read, how much it can write, and what it accepts as input.

Metricupstage logoSolar Pro 3google logoGemini 2.5 Flash Lite
Context window131K tokens1.05M tokens
Max output118K tokens66K tokens
Input typesTextAudio, File, Image, Text, Video
Output typesTextText
Reasoning effort levelsHigh, Medium, Low, Minimal, NoneNot available
Default reasoning effortMediumNot available
Release dateJanuary 27, 2026July 22, 2025

Features

Supported features

API features available for each model.

Metricupstage logoSolar Pro 3google logoGemini 2.5 Flash Lite
Tool callingSupportedSupported
Structured outputsSupportedSupported
JSON modeSupportedSupported
ReasoningSupportedSupported
TemperatureSupportedSupported
Stop sequencesNot supportedSupported
Deterministic seedNot supportedSupported
Verbosity controlNot supportedNot supported

Our take

Gemini 2.5 Flash Lite is 1.5x cheaper for a typical chat. Gemini 2.5 Flash Lite scores higher on the Artificial Analysis Intelligence Index (10.4 vs 7.8). Gemini 2.5 Flash Lite has the larger context window (1.05M vs 131K tokens). The right pick depends on your workload, so the quickest way to settle it is to send the same prompt to both and compare.

FAQ

Frequently asked questions

Is Solar Pro 3 or Gemini 2.5 Flash Lite cheaper?

Gemini 2.5 Flash Lite is cheaper for a typical chat (2K input tokens and 500 output tokens). Gemini 2.5 Flash Lite costs $0.10 per 1M input tokens and $0.40 per 1M output tokens, while Solar Pro 3 costs $0.15 per 1M input tokens and $0.60 per 1M output tokens.

Which has a bigger context window, Solar Pro 3 or Gemini 2.5 Flash Lite?

Gemini 2.5 Flash Lite supports up to 1.05M tokens of context, compared with 131K for Solar Pro 3.

Is Solar Pro 3 smarter than Gemini 2.5 Flash Lite?

On the Artificial Analysis Intelligence Index, Solar Pro 3 scores 7.8 and Gemini 2.5 Flash Lite scores 10.4, putting Gemini 2.5 Flash Lite ahead. Benchmarks don't capture everything, so the best test is running your own prompts through both.

Can I use Solar Pro 3 and Gemini 2.5 Flash Lite at the same time?

Yes. Shortcut Chat sends one prompt to multiple models at once, so you can see Solar Pro 3 and Gemini 2.5 Flash Lite answer side by side and keep the better response.

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Why choose? Ask both.

Send one prompt to Solar Pro 3 and Gemini 2.5 Flash Lite at the same time. Compare the answers side by side and keep the best one.