Gemini 2.5 Flash Preview (Sep '25) (Non-reasoning) vs Gemini 2.5 Flash Preview (Sep '25) (Reasoning)
Comparing 2 AI models · 5 benchmarks · Google
Composite Indices
Intelligence, Coding, Math
Standard Benchmarks
Academic and industry benchmarks
Benchmark Winners
Gemini 2.5 Flash Preview (Sep '25) (Non-reasoning)
No clear wins
Gemini 2.5 Flash Preview (Sep '25) (Reasoning)
- GPQA
- MMLU Pro
- HLE
- LiveCodeBench
- AIME 2025
| Metric | Go Gemini 2.5 Flash Preview (Sep '25) (Non-reasoning) | Go Gemini 2.5 Flash Preview (Sep '25) (Reasoning) |
|---|---|---|
| Pricing Per 1M tokens | ||
| Input Cost | $0.30/1M | $0.30/1M |
| Output Cost | $2.50/1M | $2.50/1M |
| Blended Cost 3:1 input/output ratio | $0.85/1M | $0.85/1M |
| Specifications | ||
| Organization Model creator | ||
| Release Date Launch date | Sep 25, 2025 | Sep 25, 2025 |
| Performance & Speed | ||
| Throughput Output speed | 237.7 tok/s | 155.2 tok/s |
| Time to First Token (TTFT) Initial response delay | 345ms | 8247ms |
| Latency Time to first answer token | 345ms | 8247ms |
| Composite Indices | ||
| Intelligence Index Overall reasoning capability | 46.7 | 54.4 |
| Coding Index Programming ability | 37.8 | 42.5 |
| Math Index Mathematical reasoning | 56.7 | 78.3 |
| Standard Benchmarks | ||
| GPQA Graduate-level reasoning | 76.6% | 79.3% |
| MMLU Pro Advanced knowledge | 83.6% | 84.2% |
| HLE Hard language evaluation | 7.8% | 12.7% |
| LiveCodeBench Real-world coding tasks | 62.5% | 71.3% |
| MATH 500 Mathematical problems | — | — |
| AIME 2025 Advanced math competition | 56.7% | 78.3% |
| AIME (Original) Math olympiad problems | — | — |
| SciCode Scientific code generation | 37.5% | 40.5% |
| LCR Code review capability | 56.7% | 64.3% |
| IFBench Instruction-following | 43.5% | 52.3% |
| TAU-bench v2 Tool use & agentic tasks | 28.4% | 45.6% |
| TerminalBench Hard CLI command generation | 13.5% | 15.6% |
Key Takeaways
Gemini 2.5 Flash Preview (Sep '25) (Non-reasoning) offers the best value at $0.30/1M, making it ideal for high-volume applications and cost-conscious projects.
Gemini 2.5 Flash Preview (Sep '25) (Reasoning) leads in reasoning capabilities with a 79.3% GPQA score, excelling at complex analytical tasks and problem-solving.
Gemini 2.5 Flash Preview (Sep '25) (Reasoning) achieves a 42.5 coding index, making it the top choice for software development and code generation tasks.
All models support context windows of ∞+ tokens, suitable for processing lengthy documents and maintaining extended conversations.
When to Choose Each Model
Gemini 2.5 Flash Preview (Sep '25) (Non-reasoning)
- Cost-sensitive applications
- High-volume processing
Gemini 2.5 Flash Preview (Sep '25) (Reasoning)
- Complex reasoning tasks
- Research & analysis
- Code generation
- Software development
Try Models for Free
Try Gemini 2.5 Flash Preview (Sep '25) (Non-reasoning) for FREE
No credit card or account required.
Try Gemini 2.5 Flash Preview (Sep '25) (Reasoning) for FREE
No credit card or account required.
Cost Calculator
Gemini 2.5 Flash Preview (Sep '25) (Non-reasoning) Gemini 2.5 Flash Preview (Sep '25) (Reasoning) Costs are estimates based on API pricing. Actual costs may vary based on caching, batch processing, and volume discounts.
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