Gemini 3.5 Flash Lite vs o3 Pro
| Signal | Gemini 3.5 Flash Lite | Delta | o3 Pro |
|---|---|---|---|
Capabilities | 100 | -- | |
Benchmarks | 75 | -14 | |
Pricing | 98 | +78 | |
Context window size | 96 | +11 | |
Recency | 100 | +44 | |
Output Capacity | 80 | -3 | |
| Overall Result | 3 wins | of 6 | 2 wins |
Score History
76.9
current score
o3 Pro
right now
86.7
current score
Gemini 3.5 Flash Lite
o3 Pro
OpenAI
Gemini 3.5 Flash Lite saves you $5845.00/month
That's $70140.00/year compared to o3 Pro at your current usage level of 100K calls/month.
| Metric | Gemini 3.5 Flash Lite | o3 Pro | Winner |
|---|---|---|---|
| Overall Score | 77 | 87 | o3 Pro |
| Rank | #112 | #61 | o3 Pro |
| Quality Rank | #112 | #61 | o3 Pro |
| Adoption Rank | #112 | #61 | o3 Pro |
| Parameters | -- | -- | -- |
| Context Window | 1049K | 200K | Gemini 3.5 Flash Lite |
| Pricing | $0.30/$2.50/M | $20.00/$80.00/M | -- |
| Signal Scores | |||
| Capabilities | 100 | 100 | Gemini 3.5 Flash Lite |
| Benchmarks | 75 | 88 | o3 Pro |
| Pricing | 98 | 20 | Gemini 3.5 Flash Lite |
| Context window size | 96 | 84 | Gemini 3.5 Flash Lite |
| Recency | 100 | 56 | Gemini 3.5 Flash Lite |
| Output Capacity | 80 | 83 | o3 Pro |
Our score (0-100) is driven by benchmark performance (90%) from Arena Elo ratings, MMLU, GPQA, HumanEval, SWE-bench, and 15+ standardized evaluations. Capabilities and context window serve as tiebreakers (10%). Learn more about our methodology.
Scores 77/100 (rank #112), placing it in the top 62% of all 290 models tracked.
Scores 87/100 (rank #61), placing it in the top 79% of all 290 models tracked.
o3 Pro has a 10-point advantage, which typically translates to noticeably better performance on complex reasoning, code generation, and multi-step tasks.
Choose Gemini 3.5 Flash Lite when you need:
- High-volume production workloads where API costs must be minimized
- Processing long documents or large codebases (1049K token context)
- Step-by-step reasoning and chain-of-thought problem solving
Choose o3 Pro when you need:
- Step-by-step reasoning and chain-of-thought problem solving
Gemini 3.5 Flash Lite offers 97% better value per quality point. At 1M tokens/day, you'd spend $42.00/month with Gemini 3.5 Flash Lite vs $1500.00/month with o3 Pro - a $1458.00 monthly difference.
Both models have comparable response speeds. For most applications, the latency difference is negligible.
When latency matters most: Interactive chatbots, IDE code completion, real-time translation, and user-facing applications where response time directly impacts experience. For batch processing, background summarization, or offline analysis, latency is less critical.
Code generation & review
Based on overall model capabilities and architecture for coding tasks like generating functions, debugging, and refactoring
Customer support chatbot
Suitable for user-facing chat with competitive response times. Gemini 3.5 Flash Lite also offers lower per-token costs for high-volume support
Long document analysis
Larger context window (1049K tokens) can process longer documents, contracts, and research papers in a single pass
Batch data extraction
Lower output pricing ($2.50/M) reduces costs when processing thousands of records daily
Creative writing & content
Higher overall composite score (87/100) correlates with better nuance, coherence, and style in long-form content
Image understanding & OCR
Supports vision input - can analyze screenshots, diagrams, photos, and scanned documents directly
o3 Pro has a moderate advantage with a 9.799999999999997-point lead in composite score. It wins on more signal dimensions, but Gemini 3.5 Flash Lite has specific strengths that could make it the better choice for certain workflows.
By Use Case
Best for Quality
Gemini 3.5 Flash Lite
Marginally better benchmark scores; both are excellent
Best for Cost
Gemini 3.5 Flash Lite
97% lower pricing; better value at scale
Best for Reliability
Gemini 3.5 Flash Lite
Higher uptime and faster response speeds
Best for Prototyping
Gemini 3.5 Flash Lite
Stronger community support and better developer experience
Best for Production
Gemini 3.5 Flash Lite
Wider enterprise adoption and proven at scale
by Google
- Choose for Quality - Marginally better benchmark scores; both are excellent
- Choose for Cost - 97% lower pricing; better value at scale
- Choose for Reliability - Higher uptime and faster response speeds
- Choose for Prototyping - Stronger community support and better developer experience
- Choose for Production - Wider enterprise adoption and proven at scale
| Capability | Gemini 3.5 Flash Lite | o3 Pro |
|---|---|---|
| Vision (Image Input) | ||
| Function Calling | ||
| Streaming | ||
| JSON Mode | ||
| Reasoning | ||
| Web Search | ||
| Image Output |
Gemini 3.5 Flash Lite
o3 Pro
OpenAI
Gemini 3.5 Flash Lite saves you $128.46/month
That's 97% cheaper than o3 Pro at 1,000 tokens/request and 100 requests/day.
Assumes 60% input / 40% output token ratio per request. Actual costs may vary based on your usage pattern.
| Parameter | Gemini 3.5 Flash Lite | o3 Pro |
|---|---|---|
| Context Window | 1.0M | 200K |
| Max Output Tokens | 65,536 | 100,000 |
| Open Source | No | No |
| Created | Jul 21, 2026 | Jun 10, 2025 |