Skip to main content
TC
TokenCost

Gemini 2.5 Flash-Lite vs o3

Complete pricing and performance comparison between Google's Gemini 2.5 Flash-Lite and OpenAI's o3.

Quick Verdict

Cheaper
Gemini 2.5 Flash-Lite
20.0x cheaper input, 20.0x cheaper output
Larger Context
Gemini 2.5 Flash-Lite
1.0M vs 200K
Higher Quality
o3
Score: 38 vs 13
Faster
Gemini 2.5 Flash-Lite
336 vs 117 tok/s

Pricing Comparison

SpecGemini 2.5 Flash-Liteo3Difference
ProviderGoogleOpenAI
Input / 1M tokens$0.1$2Gemini 2.5 Flash-Lite is 95% more expensive
Output / 1M tokens$0.4$8Gemini 2.5 Flash-Lite is 95% more expensive
Context Window1.0M200K5x difference
Max Output66K100K
Tokenizercl100k_baseo200k_base

Performance Benchmarks

MetricGemini 2.5 Flash-Liteo3Winner
Quality Index1338o3
Output Speed336 tok/s117 tok/sGemini 2.5 Flash-Lite
Time to First Token0.27s8.94sGemini 2.5 Flash-Lite
Value (Quality/$)127.019.2Higher = better value

Benchmark data from Artificial Analysis. Quality Index is a composite score across reasoning, coding, and knowledge tasks.

Cost at Scale

Estimated cost at different usage levels (3:1 input-to-output token ratio, typical for chat).

UsageGemini 2.5 Flash-Liteo3Savings
Single request
1K in / 300 out
$0.0002$0.0044Gemini 2.5 Flash-Lite saves $0.0042
10 requests
10K in / 3K out
$0.0022$0.044Gemini 2.5 Flash-Lite saves $0.042
100 requests
100K in / 30K out
$0.022$0.440Gemini 2.5 Flash-Lite saves $0.418
1,000 requests
1M in / 300K out
$0.220$4.40Gemini 2.5 Flash-Lite saves $4.18
10,000 requests
10M in / 3M out
$2.20$44.00Gemini 2.5 Flash-Lite saves $41.80
1M requests/mo
1B in / 300M out
$220.00$4400.00Gemini 2.5 Flash-Lite saves $4180.00

Pros & Cons

Gemini 2.5 Flash-Lite Strengths

  • +Cheaper input tokens
  • +Cheaper output tokens
  • +Larger context window (1.0M vs 200K)
  • +Faster output (336 vs 117 tok/s)
  • +Lower latency (faster first token)

o3 Strengths

  • +Higher max output tokens
  • +Higher quality score (38 vs 13)

When to Use Each Model

Choose Gemini 2.5 Flash-Lite for

  • →Budget-conscious projects where cost is the primary factor
  • →Long documents, large codebases, or multi-turn conversations
  • →Real-time applications, chat, or autocomplete

Choose o3 for

  • →Generating long-form content or detailed code
  • →Tasks requiring maximum accuracy and reasoning

Frequently Asked Questions

Which is cheaper, Gemini 2.5 Flash-Lite or o3?
For input tokens, Gemini 2.5 Flash-Lite is 20.0x cheaper at $0.1/1M tokens. For output tokens, Gemini 2.5 Flash-Lite is 20.0x cheaper at $0.4/1M tokens. At typical usage (1M input + 300K output), Gemini 2.5 Flash-Lite costs $0.220 vs o3 at $4.40.
What's the context window difference?
Gemini 2.5 Flash-Lite supports 1.0M context (1,048,576 tokens), while o3 supports 200K (200,000 tokens). Gemini 2.5 Flash-Lite can handle 5x more context in a single request.
Which model has better benchmarks?
Quality Index: Gemini 2.5 Flash-Lite scores 13 vs o3 at 38. Speed: Gemini 2.5 Flash-Lite generates 336 tok/s vs o3 at 117 tok/s. Time to first token: Gemini 2.5 Flash-Lite at 0.27s vs o3 at 8.94s.
When should I choose Gemini 2.5 Flash-Lite over o3?
Choose Gemini 2.5 Flash-Lite when you need: Cheaper input tokens, Cheaper output tokens, Larger context window (1.0M vs 200K), Faster output (336 vs 117 tok/s), Lower latency (faster first token). Choose o3 when you need: Higher max output tokens, Higher quality score (38 vs 13).
How much would 10,000 API requests cost?
At 1K input + 300 output tokens per request (typical chat): Gemini 2.5 Flash-Lite = $2.20, o3 = $44.00. At 10K input + 1K output per request (longer conversations): Gemini 2.5 Flash-Lite = $14.00, o3 = $280.00.

Related Comparisons

GPT-5.4 vs o3
$2.5 vs $2 per 1M input
Gemini 2.5 Flash-Lite vs GPT-5.4
$0.1 vs $2.5 per 1M input
GPT-5.4 Mini vs o3
$0.75 vs $2 per 1M input
Gemini 2.5 Flash-Lite vs GPT-5.4 Mini
$0.1 vs $0.75 per 1M input
GPT-5.4 Nano vs o3
$0.2 vs $2 per 1M input
Gemini 2.5 Flash-Lite vs GPT-5.4 Nano
$0.1 vs $0.2 per 1M input
Gemini 2.5 Flash-Lite Detailso3 DetailsFull Pricing TableCost Calculator