LV
LLMversus

Gemini 1.5 Flash vs o3: Pricing, Benchmarks & Verdict (2026)

Pricing verified Apr 8, 2026

⚡ Quick Answer

Compare Gemini 1.5 Flash and o3 across pricing, benchmarks, and capabilities.

Updated: April 8, 2026 · ✓ Pricing verified

Side-by-Side Comparison

FeatureGemini 1.5 Flasho3
ProviderGoogleOpenAI
Input Price / 1M tokens$0.075$10.00
Output Price / 1M tokens$0.300$40.00
Context Window
1M
200K
Max Output Tokens
8,192
100,000
Arena ELO
1,190
1,340
Coding ELON/A1,320
TTFT (ms)
150
600
Tokens/sec
100
15
MultimodalYesNo
JSON ModeYesYes
Function CallingYesYes
VisionNoNo
When to Use Gemini 1.5 Flash

Gemini 1.5 Flash excels at multimodal, fast-inference, cost-effective tasks.

Strengths:

  • Super cheap
  • 1M context window
  • Fast multimodal processing

Best for:

multimodalfast-inferencecost-effective
When to Use o3

o3 excels at reasoning, coding, math tasks.

Strengths:

  • Highest reasoning capability
  • Best math performance
  • Code execution

Best for:

reasoningcodingmath

Related Comparisons

Claude Opus 4 vs o3Claude Opus 4 vs Gemini 1.5 FlashGemini 2 5 Pro vs o3Gemini 1.5 Flash vs Gemini 2 5 ProDeepseek R1 vs o3O1 vs o3o3 vs Qwen 3 235bGemini Exp 1206 vs o3Gpt 4 5 vs o3Groq Deepseek R1 vs o3Llama 4 Maverick vs o3o3 vs Together Deepseek R1Grok 3 vs o3Claude Sonnet 4 vs o3Deepseek V3 vs o3Gemini 2 0 Flash Thinking vs o3o3 vs O3 MiniClaude 3 5 Sonnet vs o3Gemini 2 5 Flash vs o3O1 Mini vs o3