token.app › Compare › o3 vs Gemini 3.5 Flash Lite
o3 vs Gemini 3.5 Flash Lite
o3 leads on 2 of 3 shared benchmarks. Gemini 3.5 Flash Lite is 4.1× cheaper per token on a blended 3:1 basis. Gemini 3.5 Flash Lite accepts the larger context window (1.0M).
Head to head
Blended price uses a 3:1 input:output mix
| o3 | Gemini 3.5 Flash Lite | |
|---|---|---|
| Provider | OpenAI | |
| Input $/1M | $2.00 | $0.300 |
| Output $/1M | $8.00 | $2.50 |
| Blended $/1M | $3.50 | $0.850 |
| Context window | 200K | 1.0M |
| Max output | 100K | 66K |
| Released | Apr 2025 | Jul 2026 |
| Licence | Proprietary | Proprietary |
| GPQA Diamond | 81.8% | 83.3% |
| FrontierMath T1–3 | 33.3% | 26.0% |
| OTIS Mock AIME | 84.4% | 71.1% |
Benchmark scores independently run and published by Epoch AI, 'AI Benchmarking Hub', used under CC BY 4.0. Only benchmarks with a score for BOTH models are compared.
Choose o3 if…
- Higher FrontierMath T1–3 (33.3% vs 26.0%)
- Higher OTIS Mock AIME (84.4% vs 71.1%)
Choose Gemini 3.5 Flash Lite if…
- Costs less per token — $0.850 vs $3.50 blended
- Higher GPQA Diamond (83.3% vs 81.8%)
- Larger context window (1.0M)
- Newer model (released Jul 2026)
FAQ
Which is better, o3 or Gemini 3.5 Flash Lite?
Across the 3 benchmarks both models have independently-run scores for, o3 leads on 2 and Gemini 3.5 Flash Lite leads on 1. Benchmarks are one input — price and context window are on this page too.
Is o3 cheaper than Gemini 3.5 Flash Lite?
Gemini 3.5 Flash Lite is cheaper: $0.850 versus $3.50 per million tokens blended at 3:1 input:output. Input alone: $2.00 vs $0.300. Output alone: $8.00 vs $2.50.
What context windows do o3 and Gemini 3.5 Flash Lite have?
o3: 200,000 tokens. Gemini 3.5 Flash Lite: 1,048,576 tokens.
Who makes o3 and Gemini 3.5 Flash Lite?
o3 is made by OpenAI. Gemini 3.5 Flash Lite is made by Google.